Microstructure stability of as-extruded bimodal size SiCp/AZ91 composite

作者：Li, Jian-chao; Nie, Kai-bo; Deng, Kun-kun^*; Shang, Shuan-jun; Zhou, Shan-shan; Xu, Fang-jun; Fan, Jian-feng

来源：Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing, 2014, 615: 489-496.

DOI：10.1016/j.msea.2014.07.105

• Magnesium matrix composites
• SiCp
• Microstructure
• Micro-hardness

The microstructure stability and micro-hardness of as-extruded bimodal size (micron+submicron) SiCp/AZ91 composites were investigated. Results show that the significant grain refinement appears around micron SiCp at the temperature range of 643-693 K. Compared with monolithic AZ91 alloy and micron SiCp/AZ91 composite, the obvious submicron particle dense zones (SPDZs) are formed in the vicinity of micron SiCp in bimodal size SiCp/AZ91 composite during thermal stability test, which results in the small average grain size and improved microstructure stability. The micro-hardness of bimodal size SiCp/AZ91 composite is higher than that of monolithic AZ91 alloy and micron SiCp/AZ91 composite. The micro-hardness of bimodal size SiCp/AZ91 composite depends strongly on grain size and the lowest micro-hardness appears at 643 K.

• 出版日期2014-10-6
• 单位太原理工大学