School of Materials Science and Engineering，Chongqing University, Chongqing 400030
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DOI:
10.7502/j.issn.1674-3962.2016.11.02
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Abstract:
Mg alloys with a low density are desirable candidates as structures in aerospace/airspace industry and transportation vehicles. Twinning constitutes one of the main deformation modes of Mg alloys with a hcp structure. Many recent studies reported the application of extension twins to tailor the microstructure, texture and mechanical performance of Mg alloys. In the present paper, the progress on hardening and toughening of Mg alloys by twin boundaries (TBs) were reviewed. First, a short introduction about deformation mechanisms and twinning in Mg alloys was addressed. The character of TB-hardening and the progress were systematically concluded, with a great emphasis on the application of single twin structure and its disadvantage, hardening using a composite twin structure, the mechanism to harden in three dimensions and the principles to design effective composite twin structure. At last, the future trend about the application of TBs to harden Mg alloys was proposed.