Mechanical properties and microstructure evolution of AZ31magnesium alloy sheet subjected to high Strain rates loading of different orientations
Mechanical property tests of AZ31magnesium alloy sheet were carried out with compressive axis 0°, 45° and 90° from normal direction respectively using Split Hopkinson Pressure Bar (SHPB) . The results showed that the strain hardening rate for both 0° and 90° specimen decreases with increasing strain, and remain a constant approximately for 45° specimen at a strain rate of 2.8×103s-1. The flow stress of 45° specimen is the lowest compare with the other two specimens. Twined area fractions (TAF) , dislocation multiplication and twinning system were characterized using optical microscopy (OM) and transmission electron microscopy (TEM) . The results revealed that TAF for both 0° and 45° specimens are far less than 90° specimen at the same strain. Microstructure observation for specimens at a strain of 0.003 shows that dislocation multiplications for 0o specimen are far less than 45° specimen, and that 10-12<10-11>twinning, 10-11-10-12double twinning and twin intersection of vast amounts are activated for 90° specimen. Dynamic mechanical property anisotropy can be explained based on different microstructure evolution and plastic deformation mechanisms.
AZ31 magnesium alloy dynamic mechanical properties anisotropy twinning dislocation
YANG Yong-biao ZHANG Zhi-min Wang fuchi Han Jian Wei
College of Materials Science and Engineering, North China University, China,030051 College of Materials Science and Engineering, Beijing institute of technology,Beijing, China 100081 luanhuanneng stock limited company wang village mine, Changzhi, China, 046031
国际会议
11th IUMRS International Conference in Asia(第十一届国际材联亚洲材料大会 IUMRS-ICA 2010)
青岛
英文
213-218
2010-09-25（万方平台首次上网日期，不代表论文的发表时间）