The influence of minor Mn additions on creep resistance of die-cast Mg-Al-RE alloys

被引：45
|
作者：
Zhu, S. M. [1 ]
Abbott, T. B. [1 ,2 ,3 ]
Gibson, M. A. [1 ,3 ,4 ]
Nie, J. F. [3 ]
Easton, M. A. [1 ]
机构：
[1] RMIT Univ, Sch Engn, Carlton, Vic 3053, Australia
[2] Magontec Ltd, Sydney, NSW 2000, Australia
[3] Monash Univ, Dept Mat Sci & Engn, Clayton, Vic 3800, Australia
[4] CSIRO Mfg, Clayton, Vic 3168, Australia
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2017年 / 682卷
基金：
澳大利亚研究理事会;
关键词：
Magnesium alloys; Creep; Precipitation; Die-casting; Mn additions; DIRECTIONAL SOLIDIFICATION; MICROSTRUCTURE; BEHAVIOR; MICROSEGREGATION; AZ31; AM50;
D O I：
10.1016/j.msea.2016.11.075
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Magnesium alloys normally contain minor amounts (similar to 0.3%) of Mn to achieve improved corrosion resistance by controlling the level of Fe during melting. It has been reported recently that minor Mn additions can significantly enhance the age hardenability of die-cast Mg-Al-RE alloys. This paper reports that minor Mn additions also have a remarkable influence in improving the creep resistance of die-cast Mg-Al-RE alloys. The secondary creep rate of Mg-4Al-3La alloy at 175 degrees C/75 MPa is reduced by more than three orders of magnitude (from 5.9x10(-7) s(-1) to 3.0x10(-10) s(-1)) by the addition of 0.32% Mn. The improvement in creep resistance is associated with the dynamic precipitation of nanoscale Al-Mn particles during creep. The findings in this work shed new light on creep resistance of Mg-Al based alloys.
引用
收藏
页码：535 / 541
页数：7
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