Re-evaluation of the mechanical properties and creep resistance of commercial magnesium die-casting alloy AE44  

作　　者：Suming Zhu Trevor B.Abbott Jian-Feng Nie Hua Qian Ang Dong Qiu Kazuhiro Nogita Mark A.Easton 

机构地区：[1]School of Engineering,RMIT University,Carlton,Victoria 3053,Australia [2]Department of Materials Science and Engineering,Monash University,Victoria 3800,Australia [3]Magontec Limited,Sydney,New South Wales 2000,Australia [4]School of Mechanical and Mining Engineering,The University of Queensland,St Lucia,Queensland 4072,Australia

出　　处：《Journal of Magnesium and Alloys》2021年第5期1552-1560,共9页镁合金学报（英文）

基　　金：supported by Australian Research Council(LP160100690);Magontec Ltd.Monash Centre for Electron Microscopy(MCEM)。

摘　　要：This paper presents a re-evaluation of the room temperature mechanical properties and high temperature creep resistance of magnesium die-casting alloy AE44(Mg-4Al-4RE)in light of the influence of minor Mn addition.It is shown that the Mn-containing AE44 exhibits distinct age hardening response upon direct ageing(T5)due to the precipitation of nanoscale Al-Mn particles,as reported previously in a similar alloy.The T5 ageing leads to a significant improvement in strength with similar ductility.Consequently,the T5-aged AE44 has a remarkably better strength-ductility combination than most Mg die-casting alloys and even the Al die-casting alloy A380.Minor Mn addition is also shown to be critical for the creep resistance of AE44 whereas the influence of the RE constituent is not as significant as previously thought,which reaffirms that precipitation hardening of theα-Mg matrix is more important than grain boundary reinforcement by intermetallic phases for the creep resistance of die-cast Mg alloys.The findings in this work could provide new application perspectives for AE44,particularly in the automotive industry.

关 键 词：Magnesium alloys MANGANESE Precipitation hardening Mechanical properties Creep Die casting 

分 类 号：TG146.22[一般工业技术—材料科学与工程]