Precipitation in a Mg-10Gd-3Y-0.4Zr (wt.%) alloy during isothermal ageing at 250°C

被引：399

作者：

He, S. M.

Zeng, X. Q.

Peng, L. M.

Gao, X.

Nie, J. F.

Ding, W. J.

机构：

[1] Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, Shanghai 200030, Peoples R China

[2] Monash Univ, Dept Mat Engn, Clayton, Vic 3800, Australia

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2006年 / 421卷 / 1-2期

关键词：

heat resistant magnesium alloy; precipitation sequence; Mg-Gd-Y alloys; isothermal ageing; transmission electron microscopy;

D O I：

10.1016/j.jallcom.2005.11.046

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：

The precipitation sequence in a Mg-10Gd-3Y-0.4Zr (wt.%) alloy during isothermal ageing at 250 C has been investigated using transmission electron microscopy. It is found that the precipitation sequence involves super-saturated solid solution (S.S.S.S.) -> beta"(D0(19)) beta'(cbco) -> beta(1)(fcc) -> beta(fcc), which is similar to that of WE54 alloy but different from previously reported three-stage sequence: S.S.S.S. -> beta"(D0(19)) -> beta'(cbco) -> beta(bcc). The metastable beta' phase, which plays an important role for the age hardening of the alloy, has a shape of convex lens and is very thermally stable at 250 degrees C. Formation of beta(1) phase appears to take place via an in situ transformation from a decomposed beta' phase. (c) 2005 Elsevier B.V. All rights reserved.

引用

页码：309 / 313

页数：5

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