Double-peak ageing behavior of Mg-2Dy-0.5Zn alloy

被引：28

作者：

Bi, Guangli ^{[1
]}

Fang, Daqing ^{[1
]}

Zhao, Lei ^{[1
]}

Zhang, Qingxin ^{[1
]}

Lian, Jianshe ^{[1
]}

Jiang, Qing ^{[1
]}

Jiang, Zhonghao ^{[1
]}

机构：

[1] Jilin Univ, Coll Mat Sci & Engn, Key Lab Automobile Mat, Changchun 130025, Peoples R China

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2011年 / 509卷 / 32期

关键词：

Magnesium alloy; Mg-Dy-Zn alloy; Ageing behavior; Long period stacking ordered phase; Precipitation strengthening; STACKING ORDERED STRUCTURE; PERCENT-Y-ALLOY; MECHANICAL-PROPERTIES; MAGNESIUM ALLOY; ZN ADDITIONS; GD ALLOYS; ZR ALLOYS; AS-CAST; MG; STRENGTH;

D O I：

10.1016/j.jallcom.2011.05.117

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Ageing behavior of Mg-2Dy-0.5Zn alloy was investigated during isothermal ageing at 180 degrees C. Two significant ageing peaks were observed at 36 h and 80 h, respectively. Examination of microstructure evolution during ageing revealed that 14H long period stacking ordered (LPSO) phase forms in the alpha-Mg matrix and its volume fraction increases, (Mg, Zn)(x)Dy particle phases precipitate and their size, distribution and amount vary, as ageing time increases. The LPSO strengthening and the precipitation strengthening are two main mechanisms responsible for the double-peak ageing behavior observed for the Mg-2Dy-0.5Zn alloy. The first ageing peak is mainly attributed to the precipitation strengthening of a large amount of the fine (Mg, Zn)(x)Dy particle phases. The second ageing peak arises mainly from the LPSO strengthening of a high volume fraction of the 14H LPSO phase. (C) 2011 Elsevier B. V. All rights reserved.

引用

页码：8268 / 8275

页数：8

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