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首页> 外文期刊>Materials Science and Engineering >Microstructure and deformation mechanism of 0 0 0 1 magnesium single crystal subjected to quasistatic and high-strain-rate compressive loadings
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Microstructure and deformation mechanism of 0 0 0 1 magnesium single crystal subjected to quasistatic and high-strain-rate compressive loadings

机译：准静态和高应变率压缩载荷下0 0 0 1镁单晶的组织与变形机理

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摘要

0001 magnesium single crystal samples were mechanically tested under compressive loadings at a quasistatic strain rate (0.001 s~(-1)) and a dynamic strain rate (1000 s~(-1)), respectively. The tested samples were then investigated through various microstructural characterization techniques. Dynamic loading led to much higher maximum strength and larger strain hardening rate than quasistatic loading for the tested material. The microstructure features were clearly different from each other for the two loading conditions, which indicated that the deformation mechanisms for the quasistatic testing were different from those for the dynamic testing. The microstructure analysis showed that (a) prismatic and secondary pyramidal dislocation operations happened in the samples under quasistatic loading and dynamic loading, while tension twinning and tension-compression double twinning also happened in the sample under quasistatic loading; (b) the sample under high-strain-rate dynamic loading remained as single crystal, while that under quasistatic loading was refined to become polycrystalline; and © twinning operations under quasistatic loading led to grain refinement.
机译：在压缩载荷下分别以准静态应变率（0.001 s〜（-1））和动态应变率（1000 s〜（-1））对0001个镁单晶样品进行了机械测试。然后通过各种微结构表征技术研究被测样品。动态负载导致比准静态负载高得多的最大强度和更大的应变硬化率。两种加载条件下的微观结构特征明显不同，这表明准静态测试的变形机制与动态测试的变形机制不同。微观结构分析表明：（a）准静态载荷和动态载荷作用下，试样发生棱柱状和二次锥体位错操作；准静态载荷下，试样也发生拉伸孪生和拉伸-压缩双重孪晶作用； （b）高应变速率动态载荷下的样品保持为单晶，而准静态载荷下的样品则细化为多晶；准静态载荷下的孪晶操作导致晶粒细化。

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