Ductile fracture mechanism in fine-grained magnesium alloys with dispersion of fine particles

细晶粒弥散镁合金的延性断裂机制

• 批准号: 21760564
• 负责人: SOMEKAWA Hidetoshi
• 金额: $ 2.5万
• 依托单位: National Institute for Materials Science
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Young Scientists (B)
• 财政年份: 2009
• 资助国家: 日本
• 起止时间: 2009 至 2010
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-21760564/
• 关键词: 破壊; マグネシウム; 双晶; 転位; 変形組織観察; 有限要素解析; 破壞

The deformed microstructural observations at the beginning of the three-point bending toughness test showed that the microstructure at the head of the crack-tip composed of high-angle grain boundaries changed to that of sub-grain boundaries without any deformation twins. The prevention of twin formation led to an improvement of fracture toughness in magnesium and its alloys, since the deformation twins generally become the crack-propagation site. On the other hand, the dimple formed region showed the formation of not only sub-grain boundaries but also nano-ordered twins. The reason for the nano-ordered twin formation is that the stress to cause the particle cracking and/or interface fracture is much higher than that to form the twins.

三点弯曲韧性试验开始时的变形显微组织观察表明，裂纹尖端由大角度晶界组成的组织转变为亚晶界组织，没有任何变形孪晶。由于变形孪晶通常成为裂纹扩展的场所，因此防止孪晶的形成导致镁及其合金断裂韧性的提高。另一方面，韧窝形成区域不仅显示亚晶界的形成，而且还显示纳米有序孪晶的形成。纳米有序孪晶形成的原因是导致颗粒开裂和/或界面断裂的应力远高于形成孪晶的应力。

项目成果

Nanoindentation creep behavior of grain boundary in pure magnesium

• DOI: 10.1080/09500839.2010.514577
• 发表时间: 2010-09
• 期刊: Philosophical Magazine Letters
• 影响因子: 1.2
• 作者: H. Somekawa;T. Mukai

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Fracture mechanism and toughness in fine- and coarse-grained magnesium alloys

细晶粒和粗晶粒镁合金的断裂机制和韧性

• 发表时间: 2011
• 期刊: Magnesium Technology 2011 Edited by W.H.Sillekens, S.R.Agnew, N.R.Neelameggham, S.N.Mathaudhu, TMS
• 作者: H.Somekawa. A.Singh;T.Mukai
• 通讯作者: T.Mukai

Ductile fracture mechanism in fine-grained magnesium alloy

• DOI: 10.1080/09500839.2010.508444
• 发表时间: 2010-09
• 期刊: Philosophical Magazine Letters
• 影响因子: 1.2
• 作者: H. Somekawa;K. Nakajima;A. Singh;T. Mukai

Fracture mechanism and toughness in fine-and coarse-grained magnesium alloys, Magnesium Technology 2011, TMS2011

细粒和粗粒镁合金的断裂机制和韧性，镁技术 2011，TMS2011

• 发表时间: 2011
• 作者: H.Somekawa;A.Singh;T.Inoue T.Mukai;H.Somekawa;H.Somekawa
• 通讯作者: H.Somekawa