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978016 
Journal Article 
Effect of rare earth additions on microstructure and mechanical properties of AZ91 magnesium alloys 
Tong, GD; Liu, HF; Liu, YH 
2010 
1 
Transactions of Nonferrous Metals Society of China
ISSN: 1003-6326 
20 
S336-S340 
English 
In order to meet the demands of high temperature components in automobile, the microstructure and mechanical properties of several new die-casting AZ91-rare earth (RE) magnesium alloys were studied. The alloys were characterized by optical microscopy (OM), scan electron microscopy (SEM), energy dispersive X-ray spectrometry (EDX), tensile and creep tests. The results show that Ce addition has little effect on the mechanical properties of AZ91 alloy at high temperature, while Y and Nd addition play important role in the improvement of creep resistance. New alloys containing Y or Nd with excellent high temperature performance are selected to produce cylinder head cover of high power diesel engine of Red Flag car and oil pan of Besturn car. The new magnesium alloys with RE addition for die-casting have potential to produce power-train parts, and can greatly decrease weight.