Ductile fracture mechanism in fine-grained magnesium alloy
Ductile fracture mechanism in fine-grained magnesium alloy
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DOI：
10.1080/09500839.2010.508444
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发表时间：
2010-09
影响因子：
1.2
通讯作者：
H. Somekawa;K. Nakajima;A. Singh;T. Mukai
中科院分区：
文献类型：
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作者：
H. Somekawa;K. Nakajima;A. Singh;T. Mukai
采用透射电镜聚焦离子束技术研究了细晶镁合金的韧性断裂机制。在粗晶粒或常规镁合金中，孪晶在变形过程的最开始形成，并且裂纹扩展通过孪晶界发生。然而，在本研究中使用的合金，亚晶结构，而不是在裂纹尖端的孪晶。由于裂纹扩展路径中的大应力，随后形成纳米级孪晶。细晶合金表现出高的断裂韧性，这是由于在变形开始时对孪晶的抵抗。
The ductile fracture mechanism in a fine-grained magnesium alloy has been investigated by transmission electron microscopy-focused ion beam techniques. In coarse-grained or conventional magnesium alloys, twins form at the very beginning of the deformation process, and crack propagation occurs through the twin boundaries. However, in the alloy used in this study, subgrain structures were found instead of twins at the crack tip. Nanoscale twins formed subsequently owing to large stress in the crack propagation route. The fine-grained alloys showed high fracture toughness resulting from resistance to the twins at the beginning of the deformation.