Ductile fracture mechanism in fine-grained magnesium alloy |
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| Authors: | Hidetoshi Somekawa Kiyomi Nakajima Alok Singh Toshiji Mukai |
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| Institution: | 1. Structural Metals Center, National Institute for Materials Science, 1-2-1 Sengen , Tsukuba, Ibaraki 305-0047, Japan somekawa.hidetoshi@nims.go.jp;3. Nanotechnology Innovation Center, National Institute for Materials Science, 1-2-1 Sengen , Tsukuba, Ibaraki 305-0047, Japan;4. Structural Metals Center, National Institute for Materials Science, 1-2-1 Sengen , Tsukuba, Ibaraki 305-0047, Japan |
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| Abstract: | 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. |
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| Keywords: | magnesium alloys fracture deformation twinning twins microstructure TEM FIB |
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