摘要
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 aging hardening behavior and microstructure of Mg-5Sn-1Zn-0. 5Zr(SZK510) alloy solutionized at 480 ℃ for 10 h and aged at 175 ℃ ,200 ℃ and 225 ℃ for 1 - 100 h were studied,and the aging dynamie equations were deduced. The results indicate that microstructure of the alloy at T6 state consists of α-Mg, Mg2 Sn, a few MgZn and α-Zr phases. A strong age-hardening characteristic is found in aging hardening curves of the alloy. The parabola characteristic are observed in the three aging temperature vs microhardness curves. When aged at 175 ℃, however,the aging curve has two peak values,and the maximum hardness value is gained at 3. 98 h. The aging dynamic equation of the alloy can be expressed by JEM equation f= 1 -exp( -kt^m), and the k value decreases and m value increases when the aging temperature increases.
出处
《金属热处理》
CAS
CSCD
北大核心
2009年第11期57-59,共3页
Heat Treatment of Metals
基金
国家重大基础研究发展规划资助项目(513300114A)
关键词
镁合金
热处理
显微组织
时效硬化
Mg alloy
heat treatment
microstructure
aging hardening