Flow stress behavior and processing map of extruded 7075Al/SiC particle reinforced composite prepared by spray deposition during hot compression

被引：23
|
作者：
Wu, Hong-dan [1 ]
Zhang, Hui [1 ,2 ]
Chen, Shuang [1 ]
Fu, Ding-fa [1 ,2 ]
机构：
[1] Hunan Univ, Coll Mat Sci & Engn, Changsha 410082, Hunan, Peoples R China
[2] Hunan Univ, Key Lab Spray Deposit Technol & Applicat Hunan Pr, Changsha 410082, Hunan, Peoples R China
来源：
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA | 2015年 / 25卷 / 03期
基金：
中国国家自然科学基金;
关键词：
7075; Al; SiC; particle-reinforced composite; hot compression deformation; flow stress; processing map; superplastic deformation; DYNAMIC MATERIAL BEHAVIOR; METAL-MATRIX COMPOSITES; SUPERPLASTIC DEFORMATION; ALUMINUM-ALLOY; FABRICATION; MECHANISM; EVOLUTION; WORKING;
D O I：
10.1016/S1003-6326(15)63654-8
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
Hot compression tests of the extruded 7075Al/15% SiC (volume fraction) particle reinforced composite prepared by spray deposition were performed on Gleeble-1500 system in the temperature range of 300-450 degrees C and strain rate range of 0.001(-1) s(-1). The results indicate that the true stress-true strain curve almost exhibits rapid flow softening phenomenon without an obvious work hardening, and the stress decreases with increasing temperature and decreasing strain rate. Moreover, the stress levels are higher at temperature below 400 degrees C but lower at 450 degrees C compared with the spray deposited 7075Al alloy. Superplastic deformation characteristics are found at temperature of 450 degrees C and strain rate range of 0.001-0.1 s(-1) with corresponding strain rate sensitivity of 0.72. The optimum parameters of hot working are determined to be temperature of 430-450 degrees C and strain rate of 0.001-0.05 s(-1) based on processing map and optical microstructural observation.
引用
收藏
页码：692 / 698
页数：7
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