轻质镁合金在航空航天、 交通运输等领域的轻量化方面具有广阔的应用前景.孪生变形是六方结构镁合金室温下重要的变形机制,最近大量研究报道了利用预变形孪晶界面调控镁合金组织、 织构和力学性能.系统综述了利用拉伸孪晶组织强化镁合金的研究进展.首先介绍了镁合金的主要变形机制及拉伸孪生的特点,然后系统总结了利用拉伸孪晶强化镁合金的研究进展,重点阐述了孪晶强化特点及主要准则,包括利用单一孪晶结构强化镁合金的特点及不足、 利用复合孪晶结构实现三维强化的思路、 复合孪晶实现三维强化的机制及复合孪晶结构的设计准则.最后展望了利用孪晶组织强化镁合金的发展方向.
Mg alloys with a low density are desirable candidates as structures in aerospace/airspace industry and transpor-tation vehicles. Twinning constitutes one of the main deformation modes of Mg alloys with a hcp structure. Many recent stud-ies 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 prin-ciples to design effective composite twin structure. At last, the future trend about the application of TBs to harden Mg alloys was proposed.
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