Structural stability of ultra-fine grained magnesium alloys processed by equal channel angular pressing

被引：3
|
作者：
Janecek, M. [1 ]
Krajnak, T. [1 ]
Minarik, P. [1 ]
Cizek, J. [1 ]
Straska, J. [1 ]
Strasky, J. [1 ]
机构：
[1] Charles Univ Prague, Fac Math & Phys, Ke Karlovu 3, CR-12116 Prague 2, Czech Republic
来源：
7TH INTERNATIONAL CONFERENCE ON NANOMATERIALS BY SEVERE PLASTIC DEFORMATION | 2017年 / 194卷
关键词：
MICROSTRUCTURE;
D O I：
10.1088/1757-899X/194/1/012022
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Structural stability of two magnesium alloys AZ31 (MgAlZn) and AX41 (MgAlCa) processed by equal channel angular pressing is investigated. The mechanical properties, microstructure evolution and dislocation density were studied by microhardness, electron back scatter diffraction and positron annihilation spectroscopy, respectively. The loss of microstructure stability at high temperatures and the coarsening of the ultrafine-grained structure as a result of isochronal annealing is accompanied by the sharp decrease of microhardness and the decrease of dislocation density. The differences in thermal stability of both alloys are related to different conditions of ECAP pressing and the phase stability, namely the presence of stable Al2Ca precipitates in AX41 alloy. Microscopic mechanisms controlling the structure stability of both alloys are discussed.
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页数：6
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