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

Microstructure stability of as-extruded bimodal size SiCp/AZ91 composite
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挤压态双峰尺寸 SiCp/AZ91 复合材料的微观结构稳定性

DOI:
10.1016/j.msea.2014.07.105
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发表时间:
2014-10
影响因子:
6.4
通讯作者:
Fan, Jian-feng
Fan, Jian-feng
中科院分区:
材料科学1区
文献类型:
--
作者:
Shang, Shuan-jun;Zhou, Shan-shan;Xu, Fang-jun;Fan, Jian-feng

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研究了挤压态双峰尺寸(微米+亚微米)SiCp/AZ 91复合材料的组织稳定性和显微硬度。结果表明,在643-693 K温度范围内,微米级SiCp附近晶粒明显细化;与整体AZ 91合金和微米级SiCp/AZ 91复合材料相比,双峰尺寸SiCp/AZ 91复合材料在热稳定性试验过程中,在微米级SiCp附近形成了明显的亚微米级颗粒致密区(SPDZ),从而减小了平均晶粒尺寸,提高了组织稳定性。双峰尺寸SiCp/AZ 91复合材料的显微硬度高于整体AZ 91合金和微米SiCp/AZ 91复合材料。双峰尺寸SiCp/AZ 91复合材料的显微硬度与晶粒尺寸密切相关,在643 K时硬度最低。
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.
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