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采用扫描电子显微镜、能谱分析仪、X射线衍射仪和动态机械热分析仪等研究Zn含量对Mg-10Gd-6Y-xZn-0.6Zr(x=0.6,1.6,2.6,3.6,质量分数,%)合金显微组织、力学和阻尼性能的影响。结果表明:铸态下,Mg-10Gd-6Y-0.6Zn-0.6Zr合金中第二相主要为Mg5(Gd,Y,Zn),在Mg基体中,由晶界处向晶内平行生长出大量层状相;随Zn含量的增加,Mg5(Gd,Y,Zn)相减少,Mg12Zn(Y,Gd)相增多;当Zn含量达到3.6%时,第二相主要以Mg12Zn(Y,Gd)相存在,Mg基体中的层状相几乎消失。对于挤压态的Mg-10Gd-6Y-1.6Zn-0.6Zr合金,其基体中呈现大量扭曲的层状相,合金抗拉强度达到400 MPa,随着Zn含量的增加,合金强度呈下降趋势,但塑性得到改善。铸态合金的阻尼性能随Zn含量的增加先下降后上升,采用Granato-Lücke(G-L)理论和G-L图对合金阻尼性能进行了分析和讨论。
The effects of Zn content on the microstructures of Mg-10Gd-6Y-xZn-0.6Zr (x = 0.6,1.6,2.6,3.6, mass fraction,%) were investigated by scanning electron microscopy, energy dispersive spectroscopy, X-ray diffraction and dynamic mechanical thermal analysis ) Alloy microstructure, mechanical and damping properties. The results show that the second phase of Mg-10Gd-6Y-0.6Zn-0.6Zr alloy is mainly Mg5 (Gd, Y, Zn) in the as-cast state. In Mg matrix, The phase of Mg5 (Gd, Y, Zn) decreases and the content of Mg12Zn (Y, Gd) increases with the increase of Zn content. When the content of Zn reaches 3.6%, the second phase mainly consists of Mg12Zn (Y, Gd) Exists, the lamellar phase in the Mg matrix almost disappears. For the as-extruded Mg-10Gd-6Y-1.6Zn-0.6Zr alloy, a large amount of twisted phase appeared in the matrix. The tensile strength of the alloy reached 400 MPa. With the increase of Zn content, the strength of the alloy decreased. But plasticity has improved. The damping properties of the as-cast alloy first decrease and then increase with the increase of Zn content. The damping properties of the alloy are analyzed and discussed by Granato-Lücke (G-L) theory and G-L diagram.