Investigation of tension-compression asymmetry of magnesium by use of the acoustic emission technique

被引：52
作者：
Mathis, Kristian [1 ]
Capek, Jan [1 ]
Zdrazilova, Zuzana [1 ]
Trojanova, Zuzanka [1 ]
机构：
[1] Charles Univ Prague, Fac Math & Phys, Dept Phys Mat, Prague, Czech Republic
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2011年 / 528卷 / 18期
关键词：
Mechanical characterization; Magnesium alloys; Twinning; Dislocations; NONBASAL SLIP; ALLOY AZ31B; DEFORMATION; DISLOCATIONS; TEMPERATURE; EVOLUTION; CRYSTALS; METALS;
D O I：
10.1016/j.msea.2011.03.114
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The acoustic emission (AE) technique has been applied to in situ investigations of deformation processes of polycrystalline magnesium with various grain sizes in tension and compression from 20 to 300 degrees C. The AE signal of twin nucleation exhibited an asymmetry corresponding to the tension-compression flow stress asymmetry due to easier {10 (1) over bar2} twinning in compression. A maximum in the AE signal is observed at 200 degrees C and is interpreted as a consequence of the synergetic effect of twinning and greater slip activity at higher temperatures. A larger grain size (600 mu m) facilitated twinning. (C) 2011 Elsevier B.V. All rights reserved.
引用
收藏
页码：5904 / 5907
页数：4
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