Mg-8Sn系镁合金SPS制备及其组织性能

Microstructure and Properties of Mg-8Sn Alloy Prepared by SPS

基于Mg-8Sn系镁合金具有较好的强度、耐腐蚀性和塑性加工性,采用放电等离子烧结方法(Spark plasma sintering,SPS)在530～590℃制备了Mg-8Sn-1Al-1Zn镁合金,对镁合金的微观组织、物相、力学性能和耐腐蚀性能进行了研究。结果表明:镁合金的显微组织由α-Mg和Mg_2Sn相组成,Mg_2Sn相在界面处产生。在制备温度为570℃时抗弯曲强度最高,可达215 MPa。当烧结温度为590℃时镁合金的耐腐蚀性能最好,其电化学的电极电位和腐蚀电流密度分别为-1.5218V和1.9632×10^(-5)A/cm^2,这主要是由于Mg_2Sn在颗粒接合边界的存在,对α-Mg起到保护作用。

Based on the better strength, corrosion resistance and plastic processing of Mg-8 Sn alloy, Mg-8 Sn-1 Al-1 Zn alloy was prepared at 530～590 ℃ by spark plasma sintering（SPS）. The microstructures,phases,mechanical properties and corrosion resistance of the alloy were investigated. The results show that the microstructure of the alloy consists of α-Mg and Mg2 Sn phases,and Mg2 Sn is generated at the interface of Mg and Sn. The highest bending strength of Mg-8 Sn-1 Zn-lAl is 215 MPa which is obtained at 570 ℃. Its best corrosion resistance is obtained at 590 ℃, in which the corrosion potential and the corrosion current density are-1.5218 V and 1.9632×10^（-5） A/cm^2,respectively. It is mainly attributed to Mg2 Sn existing at particle bonding interface, which has protective effects on a-Mg.