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《Materials For Mechanical Engineering》 2004-04
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Effect of Misch Metal and Yttrium on the Ageing Behavior of AZ91 Magnesium Alloy

LIU Hong-wei,LUO Cheng-ping,LIU Jiang-wen(South China University of Technology,Guangzhou 510640,China)  
The effect of misch metal and yttrium on the ageing behavior of AZ91 magnesium alloy was investigated.Aluminum compounds of rare earth(RE) and yttrium with high melting point were crystallized fiirstly from the melt alloy during the solidifying process and pushed to the crystalllizing face of α phase to inhibit its growing,or became the nucleation of the matrix.As a result,the cast structure of AZ91 was refined.Precipitated Mg_(17)Al_(12) and dispersed network phases,i.e.,aluminum compounds of rare earth and yttrium prevented the matrix from slip,which improved the tensile properties σ_b and σ_(0.2).The peak of microhardness of the alloys was improved due to the yttrium and RE additions.The occurrence of a peak hardness was delayed because of the formation of aluminum compounds of rare earth and yttrium.
【Fund】: 国家自然科学基金资助项目(501712027);; 广东省自然科学基金资助项目(013005)
【CateGory Index】: TG156.92;
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