Effect of Yttrium on Microstructures and Properties at Elevated Temperature of Mg-0.8Zr-0.35Zn Alloys
来源期刊：JOURNAL OF RARE EARTHS2004年第2期
论文作者：王海波 宁志良 刘洪德 梁维中 刘洪汇
Key words：metal materials; microstructures; elevated temperature properties; rare earth metal;
Abstract: The effects of Y addition on microstructures and properties of as-cast and solid solutioning and aging treated Mg-0.8Zr-0.35Zn alloys at elevated temperature(250 ℃)were investigated by the use of XJG-04 optical microscopy,JCXA-733 electron probe,D/max-rB X-ray diffractometer(XRD)and WDW-200 electronic universal material testing machine.The results show that the microstructures of as-cast and heat treated Mg-0.8Zr-0.35Zn alloys with Y addition are refined and a new phase,Mg24Y5,is formed.At 250 ℃,the strength at elevated temperature of the alloys increases with increasing amount of Y addition,but relative elongation and area reduction decreases.The tendency of brittle fracture of fractured surface at elevated temperature is enlarged and fracture is changed from ductile into cleavage.
王海波1，宁志良1，刘洪德2，梁维中1，刘洪汇2
(1.School of Metal Materials,Harbin University of Science and Technology,Harbin 150040,China;
2.Harbin Dongan Autoengine Joint-Stock Co. Ltd,Harbin 150056,China)
Abstract:The effects of Y addition on microstructures and properties of as-cast and solid solutioning and aging treated Mg-0.8Zr-0.35Zn alloys at elevated temperature(250 ℃)were investigated by the use of XJG-04 optical microscopy,JCXA-733 electron probe,D/max-rB X-ray diffractometer(XRD)and WDW-200 electronic universal material testing machine.The results show that the microstructures of as-cast and heat treated Mg-0.8Zr-0.35Zn alloys with Y addition are refined and a new phase,Mg24Y5,is formed.At 250 ℃,the strength at elevated temperature of the alloys increases with increasing amount of Y addition,but relative elongation and area reduction decreases.The tendency of brittle fracture of fractured surface at elevated temperature is enlarged and fracture is changed from ductile into cleavage.
Key words:metal materials; microstructures; elevated temperature properties; rare earth metal;
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