Mechanical Properties and Microstructure Evolution of AZ31 Magnesium Alloy Sheet Subjected to High Strain Rates Loading of Different Orientations

Abstract:

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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}-{10-12}double 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.

Info:

Periodical:

Edited by:

Yafang Han, Fusheng Pan, Jianmao Tang, Chungen Zhou

Pages:

213-218

DOI:

10.4028/www.scientific.net/MSF.686.213

Citation:

Y. B. Yang et al., "Mechanical Properties and Microstructure Evolution of AZ31 Magnesium Alloy Sheet Subjected to High Strain Rates Loading of Different Orientations", Materials Science Forum, Vol. 686, pp. 213-218, 2011

Online since:

June 2011

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$35.00

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