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材料研究学报  2010, Vol. 24 Issue (6): 567-571    
  研究论文 本期目录 | 过刊浏览 |
Mg--3.04Li--0.77Sc合金的高应变率变形局部化行为
沙桂英1, 孙晓光2,  刘腾1,3,   朱宇宏1,  冯晓刚1
1.沈阳航空航天大学材料科学与工程学院 沈阳 110136
2.哈尔滨工业大学材料科学与工程学院 哈尔滨 150001
3.美国韦恩州立大学机械工程系 密歇根州 底特律 48202
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
引用本文:

沙桂英 孙晓光 刘腾 朱宇宏 冯晓刚. Mg--3.04Li--0.77Sc合金的高应变率变形局部化行为[J]. 材料研究学报, 2010, 24(6): 567-571.
. Deformation Localization Behavior of the Mg--3.04Li--0.77Sc Alloys under High--Strain Rate[J]. Chin J Mater Res, 2010, 24(6): 567-571.

全文: PDF(878 KB)  
摘要: 利用Hopkinson压杆对固溶及固溶+时效处理状态的Mg--3.04Li--0.77Sc合金进行高应变率冲击压缩实验, 研究了固溶和时效处理后该合金的高应变率变形行为。结果表明, 随着应变率提高, 固溶及固溶+时效态Mg--3.04Li--0.77Sc合金的动态变形表现为应变率弱化效应。固溶处理可增大合金的最大应变, 而时效处理可显著提高该合金的动态屈服强度。组织分析表明, 在高应变率冲击载荷下, 固溶及固溶+时效态Mg--3.04Li--0.77Sc合金产生了明显的剪切变形局部化现象。热软化及其促使的变形局部化和微裂纹沿变形带产生并扩展是该合金动态变形表现为应变率弱化效应的主要原因。
关键词 金属材料 冲击变形 Mg--Li--Sc合金 固溶 时效 应变率    
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.
Key wordsmetallic materials    impact deformation    Mg--Li--Sc alloy    solid solution treatment    ageing    strain rate
收稿日期: 2010-07-22     
ZTFLH: 

TG146.2

 
基金资助:

国家自然科学基金50801048和航空科学基金2007ZF54016资助项目。

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