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研究了Mg-5Sn-1Zn-0.5Zr(SZK510)合金经固溶处理(480℃×10h)和175、200、225℃,1～100h时效处理后的时效硬化行为和显微组织特征,并推导出该合金的时效动力学方程。结果表明,固溶时效处理后显微组织由α-Mg和Mg2Sn,以及少量的MgZn相和α-Zr组成;试验合金具有明显的时效硬化特征:在3个不同的时效温度下,硬化曲线都呈抛物线形状,但在175℃时效时,曲线出现两个峰值,并且在保温时间为3.98h有最大的显微硬度值;试验合金的时效动力学方程符合f=1-exp(-ktm)关系,随着时效温度提高,k值减小m值增大。
The age-hardening behavior and microstructure of Mg-5Sn-1Zn-0.5Zr (SZK510) alloy after solution treatment (480 ℃ × 10h) and aging treatment at 175, 200, 225 ℃ and 1 ~ Aging kinetic equation of the alloy. The results show that microstructure of the alloy after aging treatment consists of α-Mg and Mg2Sn, and a small amount of MgZn phase and α-Zr. The experimental alloy has obvious age-hardening characteristics: at three different aging temperatures, the hardening curve Parabolic shape, but at 175 ℃ aging, the curve appears two peaks, and the holding time of 3.98h has the greatest value of microhardness; experimental aging kinetics of the alloy f = 1-exp (-ktm) relationship , With the aging temperature increases, k value decreases m value increases.