Hot Deformation Behavior of SiCw/AZ91 Magnesium Matrix Composite in Compression

Abstract

The compressive behavior of squeeze cast SiCw/AZ91 composite in the temperature range of 423-723K and in the strain rate range of 0.001-0.25 s-1 was investigated. The compressive true stress-true strain curves were measured and hot deformation microstructures were observed. The strain rate sensitivity exponent (m) of the SiCw/AZ91 composite increased with the increasing of temperature. The activation energy of deformation varied over the range of test conditions examined indicated that the deformation was controlled by more than one mechanism. The reorientation of SiC whiskers in the composite was observed during compression. During the compression, dynamic recovery and dynamic recrystallization occurred in the SiCw/AZ91 composite.

Microstructure and mechanical property of the ECAPed Mg2Si/Mg composite

“…Microstructures in Mg matrix composites must therefore be improved to satisfy the high performance applications. It has been widely reported that refinement and homogenization of the reinforcement and as well the matrix grains through thermal-mechanical processing, such as conventional extrusion, rolling, subsequent heat treatment, etc., can effectively improve the mechanical property of Mg matrix composites [4][5][6][7][8][9].…”