期刊
PHILOSOPHICAL MAGAZINE
卷 98, 期 12, 页码 1068-1086出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/14786435.2018.1427896
关键词
Magnesium alloys; anisotropy; temperature; texture
类别
资金
- Shenyang Science and Technology plan 2017 project: Key Technology for Automobile Lightweight and Development of New Aluminum and Magnesium Materials and Production [17-9-6-00]
In order to investigate the effect of temperature on the anisotropic behaviour of AZ31 magnesium alloy rolling sheet under high strain rate deformation, the Split Hopkinson Pressure Bar was used to analyse the dynamic mechanical properties of AZ31 magnesium alloy rolling sheet in three directions, rolling direction (RD), transverse direction (TD) and normal direction (ND). The texture of the rolling sheet was characterised by X-ray analysis and the microstructure prior and after high strain rate deformation was observed by optical microscope (OM). The results demonstrated that AZ31magnesium alloy rolling sheet has strong initial {0 0 0 2} texture, which resulted at the obvious anisotropy in high strain rate deformation at 20 degrees C. The anisotropy reflected in stress-strain curve, yield stress, peak stress and microstructure. The anisotropy became much weaker when the deformation temperature increased up to 250 degrees C. Continuing to increase the deformation temperature to 350 degrees C the anisotropy of AZ31 rolling sheet essentially disappeared. The decreasing tendency of anisotropy with increasing temperature was due to the fact that when the deformation temperature increased, the critical resolved shear stress (CRSS) for pyramidal < c + a > slip, which was the predominant slip mechanism for ND, decreased close to that of twinning, which was the predominant deformation mechanism for RD and TD. The deformation mechanism at different directions and temperatures and the Schmid factor (SF) at different directions were discussed in the present paper.
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