Hot deformation characteristics and mechanism of PM 8009Al/SiC particle reinforced composites
Hot deformation characteristics and mechanism of PM 8009Al/SiC particle reinforced composites
复制标题
PM 8009Al/SiC颗粒增强复合材料的热变形特性及机理
DOI：
10.1016/j.msea.2017.05.016
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发表时间：
2017-06-14
期刊：
影响因子：
6.4
通讯作者：
Zhang, Hui
中科院分区：
文献类型：
--
作者：
Chen, Shuang;Teng, Jie;Zhang, Hui
The hot deformation behavior of powder metallurgy-processed 8009A1 alloys reinforced with 15% SiC particles (8009A1/SiCp composites) was investigated by compression testing at temperatures of 400-550 degrees C and strain rates of 0.001-1 s(-1). The corresponding deformed microstructures were characterized by scanning and transmission electron microscopy. The results showed that the flow stress increased with increasing strain and then stabilized at a constant value after reaching a peak value. The stress level decreased with increasing deformation temperature and decreasing strain rate, which could be represented by a Zener-Hollomon parameter in the hyperbolic-sine equation that integrates strain, temperature and strain rate. The deformation activation energy for the 8009A1/SiCi(p) composites was calculated to be 481-495 kJ/mol. The flow behavior of the composites was attributed to intense dynamic recovery caused by the high volume fraction of very fine Al-12(Fe,V)(3)Si-Phase dispersoids in the Al matrix. The accommodation ability between the SiC particles and the Al matrix was discussed as well.
