Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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Transactions of Nonferrous Metals Society of China

Vol. 18    No. 2    April 2008

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Microstructure and mechanical properties of AZ81 magnesium alloy with Y and Nd elements
XIE Jian-chang(谢建昌), LI Quan-an(李全安), WANG Xiao-qiang(王小强), LI Jian-hong(李建弘)

School of Materials Science and Engineering, Henan University of Science and Technology,Luoyang 471003, China

Abstract:The effects of rare earth(RE) elements Y and Nd (w(Y)/w(Nd)=3׃2) with total content of 1%−4% on microstructures and elevated temperature mechanical properties of AZ81 magnesium alloy were investigated. The results show that, proper content of rare earth elements makes the microstructures of AZ81 magnesium alloy refine obviously and the quantity of β-Mg17Al12 phases reduce, and Al2Y and Al2Nd form. After solid solution treatment, with increasing content of rare earth elements, the tensile strength and elongation of the alloys (at room temperature, 150 ℃ and 250 ℃) increase first, then decrease. When the content of rare earth elements is up to 2%, the values of tensile strength at room temperature and 150 ℃ are up to their maxima simultaneously, 282 MPa and 212 MPa, respectively. Meanwhile, the values of elongation at room temperature and at elevated temperature are also up to their maxima, 13% and 15%, respectively.


Key words: AZ81 magnesium alloy; rare earth; yttrium; neodymium; microstructure; mechanical properties

ISSN 1004-0609
CN 43-1238/TG

ISSN 1003-6326
CN 43-1239/TG

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