Abstract
This chapter introduces the preparation of metal matrix composites by SLM, including the preparation technology and process of Fe-based, Ti-based, Al-based, and other metal matrix composites, and further prepared gradient materials. Fe-based composites mainly involve SiC, Cr3C2, TiN, hydroxyapatite (HA), FeCoCrMoCBY, and TiB2 as reinforcing phases. The chapter then looks at the changes of composites in terms of microstructure and properties under different process parameters by comparing the composites prepared by SLM with pure Fe materials and iron-based alloys. In addition, TiB2 is also used to reinforce titanium matrix composites. The hardness and wear resistance of materials are improved obviously as the TiB2 content increases. The same phenomenon also exists with carbon nanotubes and TiC-reinforced Al-based composites. In general, the composites obtained by reinforcing a metal matrix with the mentioned reinforcing phases have obviously refined grains and greatly improved strength, hardness, and friction wear.
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