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| Deformation Localization Behavior of the Mg--3.04Li--0.77Sc Alloys under High--Strain Rate |
| SHA Guiying1, SUN Xiaoguang2, LIU Teng1,3, ZHU Yuhong1, FENG Xiaogang1 |
1.School of Materials Science and Engineering, Shenyang Aerospace University, Shenyang 110136
2.School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001
3.Department of Mechanical Engineering, Wayne State University, Detroit, MI 48202, USA |
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Cite this article:
SHA Guiying SUN Xiaoguang LIU Teng ZHU Yuhong FENG Xiaogang. Deformation Localization Behavior of the Mg--3.04Li--0.77Sc Alloys under High--Strain Rate. Chin J Mater Res, 2010, 24(6): 567-571.
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Abstract The impact compression tests for the Mg--3.04Li--0.77Sc alloys under different treatments including solid solution treatment(T4), and solid solution followed by aging treatment(T6), were conducted under high--strain rate using split Hopkinson pressure bar (SHPB). High--strain rate deformation behavior of the heat treated alloys was investigated. Results show that the dynamic deformation behavior of Mg--3.04Li--0.77Sc alloys was noted to appear a negative strain rate effect with increasing strain rate. However, the alloy at T4 treatment improved the maximum strain while that of T6 treatment improved the dynamic yield strength evidently. The alloys after impact deformation show a visible shear localization phenomena under the high--strain rate loading. The thermal softening, and deformation localization induced by the thermal softening as well as the propagation of the micro--cracks along the shear band are responsible for the negative strain rate effect of the alloys under high--strain rate.
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Received: 22 July 2010
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| Fund: Supported by National Natural Foundation No.50801048 and Aeronautical Science Foundation No.2007ZF54016. |
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