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

• 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

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，随着应变局部带的形成、传播和湮灭，在样本尺度上发生了去孪生。这是AZ31镁合金的新发现。此外，我们认识到伴随去孪生的AZ31镁合金由于去孪生而表现出微观不均匀变形，并且滑移激活也很重要。为了研究为什么显示显着去孪生行为的 0o 样品与显示拉伸性能一般形状的 90o 样品相比显示出如此不同的拉伸性能，需要研究每个样品的变形行为。因此，我们进行了微观 DIC 分析来检查滑移和解孪生对变形的影响。结果，我们发现不仅 0o 试件的应变分布因反孪生而变得不均匀，而且 90o 试件的应变分布也因滑移变形而变得不均匀。每个试件的滑移行为必须为考虑到什么类型的滑移变形被激活以及为什么应力-应变曲线有如此大的不同。我们研究了预压缩 AZ31 合金的哪种滑移系统被激活。基底<a>滑移主要在基体和预孪晶区域被激活。我们仍然需要研究拉伸变形样品的变形结构，以了解<c+a>或棱柱滑移是否被激活。

项目成果

Strain-localized Deformation Banding during Tensile Deformation of Pre-compressed AZ31 Mg Alloy

预压缩AZ31镁合金拉伸变形过程中的应变局部变形带

• 发表时间: 2022
• 作者: Jongbin Go;Myeong-heom Park;Si Gao;Nobuhiro Tsuji
• 通讯作者: Nobuhiro Tsuji

Microstructure Evolution and Tensile Properties of AZ31 Mg alloy With Crystallographically Heterogeneous Microstructure

晶体异质组织AZ31镁合金的组织演变及拉伸性能

• 发表时间: 2022
• 作者: Jongbin Go;Myeong-heom Park;Si Gao;Nobuhiro Tsuji
• 通讯作者: Nobuhiro Tsuji

AZ31マグネシウム合金で一軸圧縮によって形成される 集合組織に対する結晶学的な考察

AZ31镁合金单轴压缩织构的晶体学研究

• 发表时间: 2022
• 作者: ゴ ジョンビン;朴 明験; Si Gao;辻 伸泰
• 通讯作者: 辻 伸泰

AZ31マグネシウム合金で一軸圧縮によって形成される(0002)集合組織に対する結晶学的な考察

AZ31镁合金单轴压缩形成(0002)织构的晶体学考虑

• 发表时间: 2022
• 作者: ゴ ジョンビン;朴 明験; Si Gao;辻 伸泰
• 通讯作者: 辻 伸泰

Correlation between strain-localized deformation banding and de-twinning in AZ31 Mg alloy

AZ31 镁合金应变局部变形带与去孪晶之间的相关性

• 发表时间: 2022
• 作者: Jongbin Go;Myeong-heom Park;Si Gao;Nobuhiro Tsuji
• 通讯作者: Nobuhiro Tsuji