Effect of pressure on the solidification behavior of SiCp/Al-Mg composites
In the study, SiCp/Al-Mg metal matrix composites (MMCs) were prepared by semi-solid stirring technique. The composites were remelted and then solidified under different applied solidification pressure to study the solidification behavior of composites by DTA, SEM, and TEM. The result shows that SiCp reinforcements cannot act as heterogeneous nucleation sites for α(Al), and a interfacial layer composed of MgAl2O4 spinel and Si-rich phase was formed at Al-SiCp interface. The undercooling of the matrix alloy was improved by the applied solidification pressure, resulting in the grain refinement of matrix alloy. The XRD pattern of composites testified that the matrix exhibits a certain preferred orientation during the solidification. In addition, according to the properties test, with increasing the solidification pressure, the porosity defects in composites were decreased, and the relative density, hardness and compressive strength of composites were increased.Therefore, the microstructure and mechanical properties of the composites were improved by applied pressure during the solidification of SiCp/Al-Mg composites.
H.W.Zhang L.Geng G.H.Fan
School of Materials Science and Engineering, Harbin Institute of Technology, P.O.Box433,Harbin 150001, China
国际会议
桂林
英文
1-15
2010-11-16（万方平台首次上网日期，不代表论文的发表时间）