Microstructure and mechanical properties of die-cast AZ91D magnesium alloy by Pr additions

Mg-9Al-xPr（x=0.4,0.8 and 1.2,mass fraction,%）magnesium alloys were prepared by high-pressure die-casting technique.The effects of Pr on the microstructures of die-cast Mg-9Al based alloy were investigated by XRD and SEM.Needle-like Al11Pr3 phase and polygon Al6Mn6Pr phase are found in the microstruc...

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Bibliographic Details
Published in:Transactions of Nonferrous Metals Society of China 2010-07, Vol.20 (B07), p.435-438
Main Author: 崔晓鹏 刘海峰 孟健 张德平
Format: Article
Language:English
Subjects:
AZ91D
Coarsening
Grain boundaries
magnesium alloy
Magnesium base alloys
Mechanical properties
Microstructure
Optimization
Polygons
praseodymium
Solution strengthening
X射线衍射
力学性能
压铸技术
微观结构
机械性能
质量分数
镁合金
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Summary:Mg-9Al-xPr（x=0.4,0.8 and 1.2,mass fraction,%）magnesium alloys were prepared by high-pressure die-casting technique.The effects of Pr on the microstructures of die-cast Mg-9Al based alloy were investigated by XRD and SEM.Needle-like Al11Pr3 phase and polygon Al6Mn6Pr phase are found in the microstructure.With 0.4%Pr addition,fine needle-like Al11Pr3 phase and a small amount of polygon Al6Mn6Pr phase near the grain boundary are found in the microstructure.Increasing Pr addition to 0.8%, lots of coarse needle-like Al11Pr3 phase within grain and polygon Al6Mn6Pr phase on grain boundary are observed.Further increasing Pr addition,the size of needle-like Al11Pr3 phase decreases,while the size of polygon Al6Mn6Pr relatively increases.The mass fraction of Pr at around 0.8%is considered to be suitable to obtain the optimal mechanical properties.The optimal mechanical properties are mainly resulted from grain boundary strengthening obtained by precipitates and solid solution.
ISSN:1003-6326
DOI:10.1016/S1003-6326(10)60513-4