文章信息/Info

Title:

Second Phase Particle Strengthening in Magnesium Alloys

作者:

曾小勤1; 2; 朱慶春1; 2; 李揚欣1; 2; 丁文江1; 2

（1. 上海交通大學材料科學與工程學院 輕合金精密成型國家工程研究中心，上海 200240）

（2. 上海交通大學材料科學與工程學院 金屬基復合材料國家重點實驗室，上海 200240）

Author(s):

ZENG Xiaoqin1; 2;  ZHU Qingchun1; 2;  LI Yangxin1; 2;  DING Wenjiang1; 2

（1. National Engineering Research Center of Light Alloy Net Forming，School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240，China）

（2. State Key Laboratory of Metal Matrix Composites，School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240，China)

關鍵詞:

鎂合金; 第二相; 時效強化; 長周期堆垛有序結構相; 鎂基增強體

Keywords:

magnesium alloy;  second phase;  age-hardening;  long period stacking ordered (LPSO) phase;  Mg-based reinforcement

DOI:

10.7502/j.issn.1674-3962.2019.03.01

文獻標志碼:

A

摘要:

鎂合金作為最為輕質的金屬結構材料，廣泛應用于航空航天、汽車工業以及數碼電子產品等領域。相比于鋼鐵和鋁合金，鎂合金目前的強化手段有限，因此鎂合金中的第二相強化就顯得尤為重要。通過總結不同體系鎂合金中第二相（包括時效析出相、長周期堆垛有序LPSO相和鎂基合金中的增強體）的組織特點、強化效果及其強化機制發現：① 非稀土系鎂合金主要依靠析出相強化；② 稀土系鎂合金有效強化第二相比非稀土系鎂合金多；③ 增強體的強化效果取決于其自身的成分、形貌、尺寸以及和基體的結合能力等因素。未來鎂合金第二相強化的研究可重點關注以下幾個方向：① 新型納米強化相的引入；② LPSO相和多種析出相的協調強化作用；③ 優質廉價鎂基增強體的設計。

Abstract:

As the lightest structural metals, magnesium alloys have been widely used in fields of aerospace, automotive industry and digital electronic products. Compared with steels and aluminum alloys, magnesium alloys exhibit limited strengthening methods, so the second phase strengthening in magnesium alloys becomes particularly important. In this review paper, microstructure, strengthening effect as well as strengthening mechanism of the second phases (including aged precipitates, long-period stacking ordered (LPSO) phase and reinforcements in Mg-based alloy) in different magnesium systems are summarized as follows: ① in RE-free magnesium alloys, the most effective strengthening phases are mainly formed during ageing; ② Mg-RE based alloys show more options of strengthening second phases, as compared with RE-free magnesium alloys; ③ the strengthening effect of reinforcement depends on its own composition, morphology, size and bonding ability with the α-Mg matrix. In future, the research on the second phase strengthening in magnesium alloys should be focused on the following aspects: ① the introduction of advanced nano-strengthening phases; ② the manipulation of synergistic strengthening effect of the LPSO phase and other precipitates; ③ the design of inexpensive magnesium-based reinforcements.