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《Mining and Metallurgical Engineering》 2008-04
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Effect of Y on Microstructure and High Temperature Mechanical Properties of Mg-Nd-Zn-Zr Alloys

LIU Juan,XIA Chang-qing,ZHANG Zhi-gao(School of Materials Science and Engineering,Central South University,Changsha 410083,Hunan,China)  
Two alloys of Mg-5.0Y-3.0Nd-0.5Zn-0.5Zr and Mg-3.0Nd-0.5Zn-0.5Zr were prepared.The effect of elements of Y and Nd on microstructure and high temperature mechanical properties of the alloys was researched.The alloy phases were analyzed by X-ray diffraction(XRD).The element Nd exists as Mg12Nd in the grain boundaries with cast structure in Mg-Nd-Zn-Zr alloys,while Nd and Y as Mg41Nd5 and Mg24Y5 respectively in the grain boundaries with cast structure in the alloys.These phases are the main strengthening phase because of their nice thermal stability.The research results showed that Y was able to greatly refine the alloy cast structure.After extrusion-rolling,T6 treatment and high temperature drawing of the alloys,the tensile strength and specific elongation of Mg-5.0Y-3.0Nd-0.5Zn-0.5Zr containing element Y was obvious better than that of Mg-3.0Nd-0.5Zn-0.5Zr.At 300 ℃,the tensile strength and elongation of the former were 168.5 MPa and 28.8% respectively.
【CateGory Index】: TG146.22
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