Microstructure and mechanical properties of Mg-Zn-Y-Nd-Zr alloys
来源期刊：JOURNAL OF RARE EARTHS2013年第6期
论文作者：王晶 刘瑞东 董旭光 杨院生
文章页码：616 - 621
摘 要：The microstructure and tensile properties of the as-cast and solution treatment Mg-4.5Zn-1Y-xNd-0.5Zr （x=0,1 wt.%,2 wt.%,3 wt.%） alloys were investigated.The results showed that the microstructure of Mg-4.5Zn-1Y-0.5Zr alloy consisted of α-Mg,Zn-Zr,W （Mg3Y2Zn3） and I （Mg3YZn6） phases.With the addition of Nd,I-phase disappeared and Mg3Y2Zn3 phase changed into Mg3（Nd,Y）2Zn3 phase.When the content of Nd reached 3 wt.%,T phase,i.e.,ternary Mg-Zn-Nd phase,formed.In addition,with the increase of Nd content in the alloys,the secondary dendritic arm spacing decreased,while the amount of intermetallic phases increased.For as-cast Mg-4.5Zn-1Y-xNd-0.5Zr alloys,after solution treatment,microsegregation was eliminated and the shape of eutectic structure of α-Mg+W transformed from lamellar into spherical.The tensile strength and elongation of Mg-4.5Zn-1Y-3Nd-0.5Zr alloy were increased from 219.2 MPa and 11.0% to 247.5 MPa and 20.0%,respectively.
王晶1，刘瑞东1，董旭光1，杨院生1,2
1. Institute of Metal Research,Chinese Academy of Sciences2. New Materials Research Institute of Shandong Academy of Sciences
摘 要：The microstructure and tensile properties of the as-cast and solution treatment Mg-4.5Zn-1Y-xNd-0.5Zr （x=0,1 wt.%,2 wt.%,3 wt.%） alloys were investigated.The results showed that the microstructure of Mg-4.5Zn-1Y-0.5Zr alloy consisted of α-Mg,Zn-Zr,W （Mg3Y2Zn3） and I （Mg3YZn6） phases.With the addition of Nd,I-phase disappeared and Mg3Y2Zn3 phase changed into Mg3（Nd,Y）2Zn3 phase.When the content of Nd reached 3 wt.%,T phase,i.e.,ternary Mg-Zn-Nd phase,formed.In addition,with the increase of Nd content in the alloys,the secondary dendritic arm spacing decreased,while the amount of intermetallic phases increased.For as-cast Mg-4.5Zn-1Y-xNd-0.5Zr alloys,after solution treatment,microsegregation was eliminated and the shape of eutectic structure of α-Mg+W transformed from lamellar into spherical.The tensile strength and elongation of Mg-4.5Zn-1Y-3Nd-0.5Zr alloy were increased from 219.2 MPa and 11.0% to 247.5 MPa and 20.0%,respectively.
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