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《Journal of Southeast Univwrsity(Natural Science Edition)》 2002-03
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Effects of Ca,Si and RE additions on the microstructures and mechanical properties of AZ91 based alloys

Min Xuegang Sun Yangshan Du Wenwen Xue Feng (Department of Materials Science and Engineering, Southeast University, Nanjing 210096, China)  
Ca, Si and RE were used as additions to improve the microstructures and mechanical properties of AZ91 based alloys. The investigation results show that Ca addition to the AZ91 alloy refines the as-cast microstructure and the refinement of microstructure is more remarkable if Ca is added with Si or rare earth elements. Additions of Si and RE result in the formation of Mg 2Si and Al 11RE 3 dispersed phases in the as-cast AZ91 alloy. Small amount of Ca addition doesn't cause the formation of any new phases and most of it dissolves into the β(Mg 17Al 12) phase. With Ca addition the melting point as well as thermal stability of the β(Mg 17Al 12) phase are increased so that the creep resistance of the alloy studied is significantly improved. Although Ca addition decreases the ductility of the alloy, a combination of Ca and Si or RE enhances the strength and creep resistance of the AZ91 alloy at both room and elevated temperatures without any reduction of ductility. The best results are obtained with combined addition of 0.3% Ca and 2.0% RE in mass fraction, of which the steady state creep rate at 200 ℃/50 MPa is one order of magnitude lower than that of the base alloy.
【Fund】: 国家“8 6 3”计划资助项目 ( 2 0 0 1AA3310 30 -0 1);; 江苏省创新人才基金资助项目 (BK2 0 0 14 0 3)
【CateGory Index】: TG146.22
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