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首页> 外文期刊>Journal of Materials Engineering and Performance >Alleviation of Mechanical Anisotropy in Ultrafine/Nano-grained AZ31 Magnesium Alloy
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Alleviation of Mechanical Anisotropy in Ultrafine/Nano-grained AZ31 Magnesium Alloy

机译：超细/纳米颗粒AZ31镁合金中的机械各向异性减轻机械各向异性

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摘要

An ultrafine/nano-grained AZ31 magnesium alloy was processed through multipass accumulative back extrusion at 280 and 380 degrees C. Texture analysis was conducted to determine preferred crystallographic orientations developed during multipass deformation. The anisotropy in mechanical properties of the processed materials was studied by compressive and tensile testing. The results implied that the accumulative back extrusion effectively reduces the anisotropy of yield strength, ultimate strength and strain-to-fracture during compressive and tensile loading. The operations of different twinning/slip systems during compressive and tensile deformation were discussed using Schmid factors measurements. A decrease in twinning-related anisotropy, as well as the contribution of different slip systems in strain accommodation, could reduce the mechanical anisotropy of ultrafine/nano-grained AZ31 alloy. The compressive strength of the two-pass processed material was lower along extrusion direction than transverse direction; however, the result was reverse after four passes. The tensile behavior implied that the contribution of basal slip might accommodate strain along length as well as the thickness of the specimen, while prismatic slip may assist in narrowing the width of the specimen and elongating the length.
机译：在280和380℃下通过多数组累积背挤出处理超细/纳米颗粒AZ31镁合金。进行纹理分析以确定在多辅变形期间开发的优选的晶形取向。通过压缩和拉伸检测研究了加工材料的机械性能的各向异性。结果暗示累积背挤出有效减少了屈服强度，最终强度和应变对骨折的各向异性。使用施密因子测量讨论了在压缩和拉伸变形期间不同孪生/滑移系统的操作。与孪晶相关的各向异性的降低，以及不同滑动系统在应变容纳的贡献，可以降低超细/纳米颗粒AZ31合金的机械各向异性。双通加工材料的抗压强度沿挤出方向较低;但是，在四次通过后，结果逆转。拉伸行为暗示基础滑移的贡献可能沿着长度以及样本的厚度容纳应变，而棱柱滑动可以有助于缩小样品的宽度并伸长长度。

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