等通道转角挤压ZAM63-1Si镁合金的组织和性能

Microstructure and mechanical properties of ZAM63-1Si magnesium alloy by the equal channel angular pressing

试验研究了Mg-6Zn-3Al-1Si镁合金通过等通道转角挤压(ECAP)后的微观组织和力学性能。结果表明:ZAM63-1Si镁合金ECAP后,α-Mg基体、汉字状的Mg_2Si相及层片状MgZn相得到有效细化,随着道次的增加,汉字状Mg_2Si逐渐破碎成颗粒状,并逐步相对均匀地分布在细化后的α-Mg基体中。等通道转角挤压后,该合金的力学性能显著提高。铸态合金屈服强度为41 N/mm^2,抗拉强度为62 N/mm^2,伸长率为1.35%。1道次挤压后合金的屈服强度提高到152 N/mm^2,抗拉强度提高到173 N/mm^2,伸长率提高到2%;4道次后屈服强度和抗拉强度分别提高到210 N/mm^2和240 N/mm^2,伸长率提高到6.5%。

The microstructure and mechanical properties of Mg-6Zn-3AI-ISi magnesium alloy were studied after the equal channel angular pressing （ECAP）. The results show that the α-Mg matrix, the Chinese-character-like Mg2Si phase and the layered MgZn phase are all obviously refined in the ECAPed ZAM63-1 Si magnesium alloy. With increasing of pressing passes,the Chinese-character-like Mg2Si phase will be broken into small particles and evenly distribute in the refined α-Mg matrix gradually. The mechanical properties are significantly improved in the ECAPed ZAM63-1 Si magnesium alloy. Yield strength, tensile strength and elongation of the as-cast alloy are 41 N/mm2, 62 N/mm2, and 1.35%. Those of the alloy after 1 pressing pass are 152 N/mm2, 173 N/mm2, and 2%. Those of the alloy after 4 pressing passes are 210 N/mm2, 240 N/mm2, and 6.5%.