添加Sn对不同Mg/Si比Al-Mg-Si合金时效硬化和析出行为的影响  

Effect of Sn addition on age-hardening and precipitation behavior of Al-Mg-Si alloys with different Mg/Si ratios

作　　者：涂文斌[1,2] 唐建国 王善林[1] 马乐航[2] 赵言 TU Wenbin;TANG Jianguo;WANG Shanlin;MA Lehang;ZHAO Yan(Jiangxi Key Laboratory of Forming and Joining Technology for Aerospace Components,Nanchang Hangkong University,Nanchang 330063,China;School of Materials Science and Engineering,Central South University,Changsha 410083,China)

机构地区：[1]南昌航空大学江西省航空构件成形与连接重点实验室,南昌330063 [2]中南大学材料科学与工程学院,长沙410083

出　　处：《材料工程》2023年第10期68-75,共8页Journal of Materials Engineering

基　　金：江西省自然科学基金(20232BAB204052);江西省金属材料微结构调控重点实验室开放基金(EJ202003430);南昌航空大学博士科研启动基金(EA202003425)。

摘　　要：采用硬度测试和透射电镜研究Sn对不同Mg/Si比Al-Mg-Si合金时效硬化与析出行为的影响。结果表明:添加Sn虽然增加了低Mg/Si比合金峰值时效的析出相密度,但也降低了β″相的析出速度,从而降低了低Mg/Si比合金峰时效前的硬化速度和峰时效硬度。过时效阶段,含Sn合金的高析出相密度提高了低Mg/Si比合金过时效硬度。对于高Mg/Si比合金,添加Sn不仅增加合金的析出相密度,同时也提高了β″相的析出速度,从而增加了合金的硬化速度和峰时效硬度。The effect of Sn addition on age-hardening and precipitation behavior of Al-Mg-Si alloy with different Mg/Si ratios was investigated by using the hardness test and TEM characterization.The results indicate that the addition of Sn increases the number density of precipitates of the peak-aged alloy with low Mg/Si ratio,but decreases the precipitation rate of β″.Hence,the hardening rate and peak aging hardness of alloy with low Mg/Si ratio decrease by the addition of Sn.During over-aging,the high precipitate densities of Sn-added alloy improve the over aging hardness of the alloy with low Mg/Si ratio.For alloy with high Mg/Si ratio,the addition of Sn not only increases the precipitate density,but also enhances the precipitation rates of β″.Therefore,the hardening rate and peak-aging hardness of alloy with high Mg/Si ratio increase by the addition of Sn.

关 键 词：AL-MG-SI合金 Mg/Si比 时效析出 Sn添加 

分 类 号：TG146.2[一般工业技术—材料科学与工程]