Properties of WE43 Metal Matrix Composites Reinforced with SiC Particles

Abstract

It is well known that the properties of metal matrix composites depend upon the properties of the reinforcement phase, on the matrix and on the interface. A strong interface bonding without any degradation of the reinforcing phase is one of the prime objectives in the development of metal matrix composites. The objective of this work is to characterize the interface structure of WE43/SiC particles composite and their mechanical properties at ambient and elevated temperatures. Magnesium alloys containing yttrium and neodymium are known to have high specific strength, good creep and corrosion resistance up to 523 K. The addition of SiC ceramic particles strengthens the metal matrix composite resulting in better wear and creep resistance while maintaining good machinability. In the present study, WE43 magnesium matrix composite reinforced with SiC particulates was fabricated by stir casting. The SiC particles with 15, 45 and 250 µm diameter were added to the WE43 alloy. Microstructure characterization of WE43 MMC with 45 µm showed a relatively uniform reinforcement distribution and presence of inconsiderable porosity. Moreover, the Zr-rich particles at the particle/matrix interface were visible. The presence of SiC particles assisted in improving hardness and decreasing the tensile strength creep resistance.