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钇及混合稀土对AZ91镁合金时效析出的影响 预览 被引量:18

Effect of Misch Metal and Yttrium on the Ageing Behavior of AZ91 Magnesium Alloy
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摘要 在AZ91镁合金中添加稀土和钇之后,高熔点的铝稀土化合物和铝钇化合物在凝固过程中首先结晶析出,并成为基体相的形核中心,或者被推移到初生α相结晶前沿,阻碍α相的生长,使其铸态组织得到细化.这两种化合物以及沉淀相Mg17Al12一起成为基体滑移的障碍,使镁合金的抗拉强度和屈服强度得到提高;另一方面,这两种化合物的生成也消耗了大量的合金元素铝,削弱了时效硬化效果,并延缓了时效峰值的出现时间. 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.
作者 刘宏伟 罗承萍 刘江文 LIU Hong-wei,LUO Cheng-ping,LIU Jiang-wen(South China University of Technology,Guangzhou 510640,China)
出处 《机械工程材料》 CAS CSCD 北大核心 2004年第4期 29-32,共4页 Materials For Mechanical Engineering
基金 国家自然科学基金,广东省自然科学基金
关键词 AZ91镁合金 混合稀土 合金化 时效 AZ91 magnesium alloy misch metal alloying ageing
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