文章信息/Info

Title:

Hardening and Toughening Mg Alloys using Twin Boundaries

作者:

鄭曉劍; 余輝輝; 信運昌

重慶大學材料科學與工程學院，重慶400030

Author(s):

 ZHENG Xiaojian;  YU Huihui;  XIN Yunchang

School of Materials Science and Engineering，Chongqing University, Chongqing 400030

關鍵詞:

鎂合金; 孿晶; 強化; 各向異性; 織構

DOI:

10.7502/j.issn.1674-3962.2016.11.02

文獻標志碼:

A

摘要:

輕質鎂合金在航空航天、交通運輸等領域的輕量化方面具有廣闊的應用前景。孿生變形是六方結構鎂合金室溫下重要的變形機制，最近大量研究報道了利用預變形孿晶界面調控鎂合金組織、織構和力學性能。本文系統綜述了利用拉伸孿晶組織強化鎂合金的研究進展。首先介紹了鎂合金的主要的變形機制及拉伸孿生的特點，然后系統總結了利用拉伸孿晶強化鎂合金的研究進展，重點闡述了孿晶強化特點及主要準則，包括利用單一孿晶結構強化鎂合金的特點及不足、利用復合孿晶結構實現三維強化的思路、復合孿晶實現三維強化的機制及復合孿晶結構的設計準則。在本文最后，展望了利用孿晶組織強化鎂合金的發展方向。

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.