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{{Short description|Composite material consisting of fibers or particles in a metallic matrix}}

A '''metal matrix composite''' (MMC) is a type of [[composite material]] with at least two constituent parts, one being a [[metal]]. The other material may be a different metal or another material, such as a [[ceramic]] or [[organic compound]]. When at least three materials are present, it is called a '''hybrid composite'''. An MMC is complementary to a [[cermet]].

In [[materials science]], a '''metal matrix composite''' ('''MMC''') is a [[composite material]] with fibers or particles dispersed in a metallic [[Matrix (composite)|matrix]], such as [[copper]], [[Aluminium|aluminum]], or [[steel]]. The secondary phase is typically a [[ceramic]] (such as [[Aluminium oxide|alumina]] or [[Silicon carbide fibers|silicon carbide]]) or another metal (such as steel<ref>{{Cite journal |last1=Gopi Krishna |first1=M. |last2=Praveen Kumar |first2=K. |last3=Naga Swapna |first3=M. |last4=Babu Rao |first4=J. |last5=Bhargava |first5=N.R.M.R. |date=2018|title=Metal-metal Composites-An Innovative Way For Multiple Strengthening |journal=Materials Today: Proceedings |volume=4 |issue=8 |pages=8085–8095 |doi=10.1016/j.matpr.2017.07.148 |issn=2214-7853}}</ref>). They are typically classified according to the type of [[Reinforcement (composite)|reinforcement]]: short discontinuous fibers (whiskers), continuous fibers, or particulates. There is some overlap between MMCs and [[cermet]]s, with the latter typically consisting of less than 20% metal by volume. When at least three materials are present, it is called a '''hybrid composite'''. MMCs can have much higher [[Specific strength|strength-to-weight ratios]],<ref>{{Cite book |last=Dieter |first=George E. |title=Mechanical metallurgy |date=1986 |publisher=McGraw-Hill |isbn=0-07-016893-8 |edition=3rd |___location=New York |pages=220–226 |oclc=12418968}}</ref> [[stiffness]], and [[ductility]] than traditional materials, so they are often used in demanding applications. MMCs typically have lower [[Thermal conductivity|thermal]] and [[electrical conductivity]] and poor resistance to radiation{{Citation needed|date=March 2022}}, limiting their use in the very harshest environments.

== Composition==

MMCs are made by dispersing a reinforcing material into a metal matrix. The reinforcement surface can be coated to prevent a chemical reaction with the matrix. For example, [[carbon fibers]] are commonly used in aluminum[[aluminium]] matrix to synthesize composites containingshowing low density and high strength. However, carbon reacts with aluminumaluminium to generate a brittle and water-soluble compound Al4C3[[aluminium carbide|Al₄C₃]] on the surface of the fiber. To prevent this reaction, the carbon fibers are coated with Nickel[[nickel]] or [[titanium boride]].

=== Matrix ===

The matrix is the "frame"[[Single crystal|monolithic]] material into which the reinforcement is embedded, and is completely continuous. This means that there is a path through the matrix to any point in the material, unlike two materials sandwiched together. TheIn structural applications, the matrix is usually a lighter metal such as [[aluminum]], [[magnesium]], or [[titanium]], and provides a compliantcomplete support for the reinforcement. In high-temperature applications, [[cobalt]] and cobalt–[[nickel]] alloy matrices are common.

=== Reinforcement ===

The reinforcement material is embedded into thea matrix. The reinforcement does not always serve a purely structural task (reinforcing the compound), but is also used to change physical properties such as [[wear resistance]], [[friction]] coefficient, or [[thermal conductivity]]. The reinforcement can be either continuous, or discontinuous. Discontinuous MMCs can be [[isotropic]], and can be worked with standard metalworking techniques, such as extrusion, forging, or rolling. In addition, they may be machined using conventional techniques, but commonly would need the use of polycrystalline-diamond tooling (PCD).

Continuous reinforcement uses monofilament wires or fibers such as [[carbon (fiber)|carbon fiber]] or [[silicon carbide]]. Because the fibers are embedded into the matrix in a certain direction, the result is an [[anisotropic]] structure in which the alignment of the material affects its strength. One of the first MMCs{{Which|date=June 2025}} used [[boron]] filament as reinforcement. Discontinuous reinforcement uses [[Monocrystalline whisker|"whiskers"]], short fibers, or particles. The most common reinforcing materials in this category are [[alumina]] and [[silicon carbide]].<ref>''Materials science and Engineering, an introduction''. William D. Callister Jr, 7th Ed, Wiley and sons publishing</ref>

== Manufacturing and forming methods ==

MMC manufacturing can be broken into three types: solidtypes—solid, liquid, and vapor.

Liquid=== Solid-state methods ===

MMC manufacturing can be broken into three types: solid, liquid, and vapor.

* Powder blending and consolidation ([[powder metallurgy]]): Powdered metal and dicontinuousdiscontinuous reinforcement are mixed and then bonded through a process of compaction, degassing, and thermo-mechanical treatment (possibly via [[hot isostatic pressing]] (HIP) or [[extrusion]]).

* Foil [[diffusion]] bonding: Layers of metal foil are sandwiched with long fibers, and then pressed through to form a matrix.

Solid=== Liquid-state methods ===

* [[Electroplating]] and [[electroforming]]: A solution containing metal ions loaded with reinforcing particles is co-deposited forming a composite material.

* Powder blending and consolidation ([[powder metallurgy]]): Powdered metal and dicontinuous reinforcement are mixed and then bonded through a process of compaction, degassing, and thermo-mechanical treatment (possibly via [[hot isostatic pressing]] (HIP) or [[extrusion]]).

* [[Stir casting]]: Discontinuous reinforcement is stirred into molten metal, which is allowed to solidify.

* Foil [[diffusion]] bonding: Layers of metal foil are sandwiched with long fibers, and then pressed through to form a matrix.

* Pressure infiltration: Molten metal is infiltrated into the reinforcement through the use of a kind of pressure such as gas pressure.

* [[Squeeze casting]]: Molten metal is injected into a form with fibers preplacedpre-placed inside it.

Liquid state methods

* [[Spray desposition|Spray deposition]]: Molten metal is sprayed onto a continuous fiber substrate.

* Stir casting: Discontinuous reinforcement is stirred into molten metal, which is allowed to solidify.

* Squeeze casting: Molten metal is injected into a form with fibers preplaced inside it.

* Spray deposition: Molten metal is sprayed onto a continuous fiber substrate.

* Reactive processing: A [[chemical reaction]] occurs, with one of the reactants forming the matrix and the other the reinforcement.

=== Semi-solid-state methods ===

Vapor deposition

* Semi-solid powder processing: A powder mixture is heated up to semi-solid state and pressure is applied to form the composites.<ref>{{cite journal | last1 = Wu | first1 = Yufeng | last2 = Gap | last3 = Kim | first3 = Yong | year = 2011 | title = Carbon nanotube reinforced aluminum composite fabricated by semi-solid powder processing | journal = Journal of Materials Processing Technology | volume = 211 | issue = 8| pages = 1341–1347 | doi=10.1016/j.jmatprotec.2011.03.007}}</ref><ref>{{cite journal | last1 = Wu | first1 = Yufeng | last2 = Yong Kim | first2 = Gap | display-authors = etal | year = 2010 | title = Fabrication of Al6061 composite with high SiC particle loading by semi-solid powder processing | journal = Acta Materialia | volume = 58 | issue = 13| pages = 4398–4405 | doi=10.1016/j.jmatprotec.2011.03.007}}</ref><ref>{{cite journal | last1 = Wu | first1 = Yufeng | last2 = Yong Kim | first2 = Gap | display-authors = etal | year = 2015 | title = Compaction behavior of Al6061 and SiC binary powder mixture in the mushy state | journal = Journal of Materials Processing Technology | volume = 216 | pages = 484–491 | doi=10.1016/j.jmatprotec.2014.10.003}}</ref>

* [[Physical vapor deposition]]: The fiber is passed through a thick cloud of vaporized metal, coating it. [http://www.ipm.virginia.edu/research/PVD/AppDriven/CFRMMC/cfrmmc.htm]

=== Vapor deposition ===

* [[Physical vapor deposition]]: The fiber is passed through a thick cloud of vaporized metal, coating it. [http://www.ipm.virginia.edu/research/PVD/AppDriven/CFRMMC/cfrmmc.htm]

=== In-situ fabrication techniques ===

* Controlled unidirectional solidification of a [[Eutectic system|eutectic]] alloy can result in a two-phase microstructure with one of the phases, present in [[Lamella (materials)|lamellar]] or fiber form, distributed in the matrix.<ref>[http://www.ipm.virginia.edu/research/PVD/AppDriven/CFRMMC/cfrmmc.htm University of Virginia's Directed Vapor Deposition (DVD) technology]</ref>

== Residual stress ==

MMCs are fabricated at elevated temperatures, which is an essential condition for diffusion bonding of the fiber/matrix interface. Later on, when they are cooled down to the ambient temperature, [[Residual stress|residual stresses]] are generated in the composite due to the mismatch between the coefficients of the metal matrix and fiber. The manufacturing residual stresses significantly influence the mechanical behavior of the MMCs in all loading conditions. In some cases, thermal residual stresses are high enough to initiate plastic deformation within the matrix during the manufacturing process.<ref>{{Cite book|title=Residual Stresses in Composite Materials|last1=Aghdam|first1=M. M.|last2=Morsali|first2=S. R.|date=2014-01-01|publisher=Woodhead Publishing|isbn=9780857092700|pages=233–255}}</ref>

== Effect on mechanical properties ==

The addition of ceramic particles in general increases the strength of the material while having a tradeoff on material ductility. For example, a Al-[[Aluminium oxide|Al₂O₃]] composite can increase the yield strength of cast [[6061 aluminium alloy|Al 6061 alloys]] from 105 to 120 MPa and increase the [[Young's modulus]] from 70 to 95 GPa.<ref>{{Cite journal |last1=Park |first1=B. G. |last2=Crosky |first2=A. G. |last3=Hellier |first3=A. K. |date=2001-05-01 |title=Material characterisation and mechanical properties of Al2O3-Al metal matrix composites |url=https://doi.org/10.1023/A:1017921813503 |journal=Journal of Materials Science |language=en |volume=36 |issue=10 |pages=2417–2426 |doi=10.1023/A:1017921813503 |issn=1573-4803|url-access=subscription }}</ref> However, the composite had negative effects on the ductility, decreasing it from 10% to 2%. Ultimately, the increase in elastic modulus is significant because the metals get the benefit of the higher [[Specific modulus|specific stiffness]] of ceramics while retaining some [[ductility]].<ref>{{Cite journal |last1=Suh |first1=Jin-Yoo |last2=Lee |first2=Young-Su |last3=Shim |first3=Jae-Hyeok |last4=Park |first4=Hoon Mo |date=January 2012 |title=Prediction of elastic properties of precipitation-hardened aluminum cast alloys |url=https://doi.org/10.1016/j.commatsci.2011.07.061 |journal=Computational Materials Science |volume=51 |issue=1 |pages=365–371 |doi=10.1016/j.commatsci.2011.07.061 |issn=0927-0256|url-access=subscription }}</ref><ref>{{Cite book |last=Ashby |first=Mike |title=Materials Selection in Mechanical Design |publisher=Butterworth-Heinemann: Amsterdam |year=2005 |edition=3rd}}</ref> Metal-matrix composites can also significantly increase the wear resistance and hardness of aluminum alloys. Al₂O₃ particles were found to significantly increase the wear resistance of an Al-Si alloy, and [[Silicon dioxide|SiO₂]] particles increased the hardness of a Al-[[Magnesium|Mg]] alloy significantly.<ref>{{Cite journal |last1=Megahed |first1=M. |last2=Saber |first2=D. |last3=Agwa |first3=M. A. |date=2019-10-01 |title=Modeling of Wear Behavior of Al–Si/Al2O3 Metal Matrix Composites |url=https://doi.org/10.1134/S0031918X19100089 |journal=Physics of Metals and Metallography |language=en |volume=120 |issue=10 |pages=981–988 |doi=10.1134/S0031918X19100089 |issn=1555-6190|url-access=subscription }}</ref><ref>{{Cite journal |last1=Bhatt |first1=J. |last2=Balachander |first2=N. |last3=Shekher |first3=S. |last4=Karthikeyan |first4=R. |last5=Peshwe |first5=D.R. |last6=Murty |first6=B.S. |date=September 2012 |title=Synthesis of nanostructured Al–Mg–SiO2 metal matrix composites using high-energy ball milling and spark plasma sintering |url=https://doi.org/10.1016/j.jallcom.2011.12.062 |journal=Journal of Alloys and Compounds |volume=536 |pages=S35–S40 |doi=10.1016/j.jallcom.2011.12.062 |issn=0925-8388|url-access=subscription }}</ref> The application of this is in light, wear-resistant alloys for wear components such as [[piston]] liners in automobile engines. Current{{When|date=June 2025}} aluminum alloys are soft and often require hard, heavy [[Cast iron|cast-iron]] liners, which reduces the benefits of the lightweight aluminum engines.

[[Fracture toughness]] of the composites is typically dominated by the metal phases; however, it can also be dominated by the ceramic phase or delamination, depending on the material system.<ref>{{Cite journal |last1=Agrawal |first1=Parul |last2=Sun |first2=C.T. |date=July 2004 |title=Fracture in metal–ceramic composites |url=https://doi.org/10.1016/j.compscitech.2003.09.026 |journal=Composites Science and Technology |volume=64 |issue=9 |pages=1167–1178 |doi=10.1016/j.compscitech.2003.09.026 |issn=0266-3538|url-access=subscription }}</ref> For example, the Cu/Al₂O₃ system has a high [[thermal expansion]] mismatch, causing localized stresses that encourage crack propagation in the form of delamination. This significantly inhibits its fracture toughness compared to other compositions. In an Al/Al₂O₃ co-continuous system, the crack propagated through the ceramic phase and was deflected upon reaching interfaces with the metallic phases. As a result, more energy was needed to deflect the crack around the phases, and the composite was significantly toughened. Overall, fracture toughness is largely dependent on MMC composition due to thermal mismatch and crack modes but can toughen composites with low thermal mismatch.

MMCs strengthen materials against [[Plasticity (physics)|plasticity]] for a variety of reasons. The first is direct load transfer to the stronger ceramic particles.<ref>{{Cite journal |last1=Chawla |first1=N. |last2=Shen |first2=Y.-L. |date=June 2001 |title=Mechanical Behavior of Particle Reinforced Metal Matrix Composites |url=https://onlinelibrary.wiley.com/doi/10.1002/1527-2648(200106)3:63.0.CO;2-I |journal=Advanced Engineering Materials |language=en |volume=3 |issue=6 |pages=357–370 |doi=10.1002/1527-2648(200106)3:6<357::AID-ADEM357>3.0.CO;2-I |issn=1438-1656|url-access=subscription }}</ref> The second is due to the difference in plastic deformation of the two components. This causes a [[dislocation]] to become pinned on the stronger particles and bow around them to continue moving. Dislocations typically drive plastic deformation due to the lower energy to move them rather than moving an entire plane of atoms. Therefore, pinning them causes a large increase in the energy and stress required for plastic deformation (see [[precipitation hardening]]). The final mechanism is caused by the stress from thermal and coherency mismatch.<ref>{{Cite journal |last1=Khraishi |first1=Tariq A. |last2=Yan |first2=Lincan |last3=Shen |first3=Yu-Lin |date=June 2004 |title=Dynamic simulations of the interaction between dislocations and dilute particle concentrations in metal–matrix composites (MMCs) |url=https://doi.org/10.1016/j.ijplas.2003.10.003 |journal=International Journal of Plasticity |volume=20 |issue=6 |pages=1039–1057 |doi=10.1016/j.ijplas.2003.10.003 |issn=0749-6419|url-access=subscription }}</ref> This creates a stress field, which traps dislocations, creating a pileup, further inhibiting plastic deformation.

== Applications ==

{{Unreferenced section|date=March 2016}}

*Carbide [[drill]]s are often made from a soft cobalt matrix with tough [[tungsten carbide]] particles inside.

* High-performance [[tungsten carbide]] [[cutting tool]]s are made from a tough [[cobalt]] matrix cementing the hard tungsten carbide particles; lower-performance tools can use other metals such as [[bronze]] as the matrix.

* Some tank armors may be made from metal matrix composites, probably steel -reinforced with [[boron nitride]]., Boron nitridewhich is a good reinforcement for steel because it is very stiff and it does not dissolve in molten steel.

* Some [[automobile|automotive]] [[disc brake]]s use MMCs. Early [[Lotus Elise]] models used Aluminumaluminum MMC rotors, but they have less -than -optimal heat properties, and Lotus has since switched back to [[cast- iron]]. Modern high-performance [[sportSports car|sports cars]]s, such as those built by [[Porsche]], use rotors made of [[Carbon fibers|carbon fiber]] within a [[silicon carbide]] matrix because of its high [[specific heat]] and [[thermal conductivity]]. [[3M]] sellsdeveloped a preformed aluminum matrix insert for strengthening cast aluminum disc brake calipers,<ref name=3M-1>[https://web.archive.org/web/20040731120853/http://www.3m.com/market/industrial/mmc/brake_caliperPDFs/AMC_Brake_Caliper_Brochure_3.html],pdf allowingAluminium themmatrix tocomposite weigh(AMC) asinserts muchfor asreinforced 50%brake lesscalipers (Archived)]</ref> reducing weight by half compared to cast iron while increasingretaining similar stiffness. 3M has also used alumina preforms for AMC [[pushrod]]s.<ref name=3M-2>[https://web.archive.org/web/20080429232531/http://solutions.3m.com/wps/portal/3M/en_US/Energy-Advanced/Materials/Industry_Solutions/MMC/Pushrods/ Industry Solutions - Metal Matrix Composites - High performance, high strength, metal matrix composite material (Archived)]</ref>

*Toyota has since used metal matrix composites in the 2ZZ-GE engine block, and the [[Porsche Boxster]] and [[Porsche 911|911]] use MMCs to reinforce the engine's cylinder sleeves. (Lotus uses the 2ZZ-GE in later Elise S2 versions). The 2ZZ-GE engine is actually designed and built by Yamaha, as were the Iron-block Toyota 4A-GE, etc. Prior, Honda had already used Aluminum MMC in its high-performance engine blocks such as the H22 and later the K20.

* [[Cosworth]] uses a metal matrix composite [[piston]] for their [[Cosworth GMA]] [[V12 engine]] on the [[Gordon Murray Automotive T.50]] and [[Gordon Murray Automotive T.33]] supercars.

* The [[F-16 Fighting Falcon]] uses monofilament silicon carbide fibres in a titanium matrix for a structural component of the jet's landing gear.

* [[Ford Motor Company|Ford]] offers a metal matrix composite [[driveshaft]] upgrade. The MMC driveshaft is made of an aluminum matrix reinforced with [[boron carbide]], allowing the critical speed of the driveshaft to be raised by reducing inertia. The MMC driveshaft has become a common modification for racers, allowing the top speed to be increased far beyond the safe operating speeds of a standard aluminum driveshaft.

* [[Specialized Bicycle Components|Specialized Bicycles]] have used aluminium MMC compounds for their top of the range [[bicycle]] frames for several years.

* [[Honda]] has used aluminum matrix composite cylinder liners in some of their engines, including the [[Honda B20A engine|B21A1]], [[Honda H engine|H22A and H23A]], [[Honda F20C engine|F20C and F22C]], and the [[Honda C engine|C32B]] used in the [[Honda NSX|NSX]].

* [[Toyota]] has since used metal matrix composites in the [[Yamaha Motor Company|Yamaha]]-designed [[Toyota ZZ engine#2ZZ-GE|2ZZ-GE]] engine which is used in the later [[Lotus Elise#Series 2|Lotus Elise S2]] versions as well as Toyota car models, including the eponymous [[Toyota Matrix]]. Porsche also uses MMCs to reinforce the engine's cylinder sleeves in the [[Porsche Boxster|Boxster]] and [[Porsche 911|911]].

* The [[F-16 Fighting Falcon]] uses monofilament silicon carbide fibresfibers in a [[titanium]] matrix for a structural component of the jet's [[landing gear]].

* [[Specialized Bicycle Components|Specialized Bicycles]] havehas used aluminiumaluminum MMC compounds for theirits top -of -the -range [[bicycle]] frames for several years. [[Griffen Bicycles]] also made boron carbide–aluminum MMC bike frames, and [[Univega]] briefly did so as well.

* Some equipment in [[particle accelerator]]s such as [[Radio-frequency quadrupole|radio-frequency quadrupoles]] or electron targets use copper MMC compounds such as [[Glidcop]] to retain the material properties of copper at high temperatures and radiation levels.<ref name=ratti>{{Cite book | isbn = 978-0-7803-5573-6 | volume = 2 | issue = 1 | pages = 884–886 | last = Ratti | first = A. | author2 = R. Gough | author3 = M. Hoff | author4 = R. Keller | author5 = K. Kennedy | author6 = R MacGill | author7 = J. Staples | title = Proceedings of the 1999 Particle Accelerator Conference (Cat. No.99CH36366) | chapter = The SNS RFQ prototype module | year = 1999 | doi = 10.1109/PAC.1999.795388 | bibcode = 1999pac..conf..884R | s2cid = 110540693 | chapter-url = http://tdserver1.fnal.gov/8gevlinacpapers/Front_End/SNS_RFQ_Prototype_PAC99.pdf | access-date = 2009-03-09 | archive-url = https://web.archive.org/web/20100326134132/http://tdserver1.fnal.gov/8gevlinacpapers/Front_End/SNS_RFQ_Prototype_PAC99.pdf | archive-date = 2010-03-26 | url-status = dead }}</ref><ref name=mochizuki>{{Cite journal | volume = 5 | issue = 4 | pages = 1199–1201 | last = Mochizuki | first = T. |author2=Y. Sakurai |author3=D. Shu |author4=T. M. Kuzay |author5=H. Kitamura | title = Design of Compact Absorbers for High-Heat-Load X-ray Undulator Beamlines at SPring-8 | journal = Journal of Synchrotron Radiation | year = 1998 | doi = 10.1107/S0909049598000387 | url= http://journals.iucr.org/s/issues/1998/04/00/az2000/az2000.pdf |archive-url=https://web.archive.org/web/20110726201449/http://journals.iucr.org/s/issues/1998/04/00/az2000/az2000.pdf |archive-date=2011-07-26 |url-status=live | pmid = 16687820| bibcode = 1998JSynR...5.1199M }}</ref>

* A [[copper]]-[[silver]] alloy matrix containing 55% by volume [[diamond]] particles, known as [[dymalloy]], is used as a substrate for high-power, high-density [[multi-chip module]]s in electronics for its very high thermal conductivity. [[AlSiC]] is an aluminium–[[silicon carbide]] composite for similar applications.

* [[Aluminium]]-[[graphite]] composites are used in [[Power electronics|power-electronic]] modules because of their high [[thermal conductivity|thermal conductivities]], the adjustable [[coefficient of thermal expansion|coefficients of thermal expansion]], and their low [[density|densities]].

MMCs are nearly always more expensive than the more conventional materials they are replacing. As a result, they are found where improved properties and performance can justify the added cost. Today, these applications are found most often in aircraft components, [[space technology|space systems]], and high-end or "boutique" sports equipment. The scope of applications will certainly increase as manufacturing costs are reduced.

In comparison with conventional polymer matrix composites, MMCs are resistant to fire, can operate in wider range of temperatures, do not absorb [[moisture]], have better [[electrical conductivity|electrical]] and thermal conductivity, are resistant to [[radiation damage]], and do not display [[outgassing]]. On the other hand, MMCs tend to be more expensive, the fiber-reinforced materials may be difficult to fabricate, and the available experience in use is limited.

==See also==

*[[Advanced composite materials (science & engineering)|Advanced composite materials]]

*[[organic matrix composite]]

*[[cermetBabbitt (metal)]]

*[[Wrought iron]]

== References ==

{{reflist}}

== External links ==

* [http://mmc-assess.tuwien.ac.at/index1.htm Assessment of Metal Matrix Composites for Innovations]

* [http://www.umms.sav.sk/uk_full/aktivity/kompozity.html Closeup photos of MMCs]

* [http://mmc-assess.tuwien.ac.at/index1.htm Assessment of Metal Matrix Composites for Innovations]

* [http://www.tms.org/pubs/journals/JOM/0104/Rawal-0104.html Space application of MMCs]

* [http://www.cmt-ltd.com Composite Metal Technology Ltd]

* http://jrp.sagepub.com/content/32/17/1310.abstract

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