【摘要】 以Mg粉、Sn粉和Zn粉为初始原料,采用机械合金化和热压烧结的方法制备Mg-25Sn-x Zn合金。研究了Zn添加量对Mg-25Sn合金显微组织和性能的影响。结果表明:Mg-25Sn-x Zn体系的机械合金化过程中,Zn元素不参与合金化反应,但Zn的引入降低了Mg+Mg2Sn混合物的尺寸。除固溶外,烧结态Mg-25Sn-x Zn中Zn完全转变成MgZn2相。且随Zn含量的增加,MgZn2相的尺寸逐步增大,Mg晶界和Mg2Sn颗粒相周围是MgZn2相的择优分布位置。添加6%Zn(质量分数)的Mg-25Sn合金具有最优的力学性能,其显微维氏硬度为1.60GPa、屈服强度为388MPa、抗压强度为497 MPa、断裂应变7.5%。更多还原

【Abstract】 Mg-25 Sn-x Zn alloys were prepared by mechanical alloying and hot-press sintering methods with Mg powders, Sn powders and Zn powders as raw materials. The effects of the Zn content on microstructures and mechanical properties of the Mg-25 Sn alloys were studied. The results show that Zn does not participate in the alloying reaction in the mechanical alloying process of Mg-25 Sn-x Zn system, but the addition of Zn reduces the size of Mg+Mg2 Sn mixture. The Zn in the sintered Mg-25 Sn-x Zn is completely transformed into MgZn2 phase except the solution. And with the increase of the Zn content, the size of MgZn2 phase gradually increases. MgZn2 phase is preferentially distributed along Mg grain boundary and around Mg2 Sn particle phase. When the Zn addition is 6 wt%, the Mg-25 Sn alloy exhibits excellent mechanical properties, its hardness, yield strength, fracture strength and strain are 1.60 GPa, 388 MPa, 497 MPa and 7.5%, respectively.更多还原