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不均一超微細粒組織を有するマグネシウム合金の変形機構の解明

阐明非均匀超细晶粒结构镁合金的变形机制

基本信息

批准号：
22KJ1859
负责人：
高鍾斌
金额：
$ 1.09万
依托单位：
Kyoto University
依托单位国家：
日本
项目类别：
Grant-in-Aid for JSPS Fellows
财政年份：
2023
资助国家：
日本
起止时间：
2023-03-08 至 2024-03-31
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-22KJ1859/
关键词：
Magnesium alloys De-twinning Slip Deformation nature Anisotropy

项目摘要

We found out that de-twinning takes place in a specimen scale with formation, propagation, and annihilation of strain-localized banding during the tensile test. This is a new finding in AZ31 Mg alloy. Furthermore, we realized that AZ31 Mg alloy accompanying de-twinnning shows microscopic inhomogeneous deformation due to de-twinning and slip activation is also important. In order to investigate why the 0o specimen showing significant de-twinning behavior shows such different tensile properties in comparison to the 90o specimen showing the general shape of tensile properties, the deformation behavior of each specimen needs to be investigated. Therefore, we conducted a micro-DIC analysis to examine the effect of slip and de-twin on deformation. As a result, we figured out that not only the strain distribution of the 0o specimen was heterogeneous due to de-twinning, but also the strain distribution of the 90o specimen was inhomogeneous due to the slip deformation.The slip behavior of each specimen must be taken into account to understand what kinds of slip deformation are activated and why the stress-strain curve is so much different. We investigated which kinds of slip systems of a pre-compressed AZ31 alloy were activated. Basal <a> slip was mainly activated in the matrix and pre-twinned region. We still need to investigate the deformation structure of tensile deformed specimens to know whether <c+a> or prismatic slip was activated or not.

我们发现，在拉伸试验过程中，在试样尺度上，随着应变局域带的形成、传播和湮灭，发生了去孪生。这是AZ31镁合金的新发现。此外，我们认识到AZ31镁合金在去孪晶过程中表现出微观的不均匀变形，滑移激活也很重要。为了研究为什么表现出显著去孪生行为的00试样与表现出一般拉伸性能形状的90试样相比，表现出如此不同的拉伸性能，需要研究每个试样的变形行为。因此，我们进行了微观dic分析，以研究滑移和去孪生对变形的影响。结果表明，由于去孪晶的作用，试样的应变分布是不均匀的，而且由于滑移变形，试样的应变分布也是不均匀的。必须考虑每个试件的滑移行为，以了解何种滑移变形被激活，以及应力-应变曲线为何如此不同。研究了预压缩AZ31合金的几种滑移体系被激活的情况。基底滑移主要在基质和预孪晶区激活。我们还需要研究拉伸变形试样的变形结构，以确定是否激活了<c+a>或棱柱滑移。