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Ductile fracture mechanism in fine-grained magnesium alloy

机译:细晶镁合金的延性断裂机理

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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.
机译:已经通过聚焦于透射电子显微镜的离子束技术研究了细晶粒镁合金中的韧性断裂机理。在粗晶粒或常规镁合金中,孪晶在变形过程的最开始就形成,并且裂纹扩展通过孪晶边界发生。然而,在本研究中使用的合金中,在裂纹尖端发现了亚晶粒结构而不是孪晶。由于裂纹扩展路径中的大应力,随后形成了纳米尺度的孪晶。细晶粒合金显示出高的断裂韧性,这是由于变形开始时对孪晶的抵抗力所致。

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