Effects of process parameters on mechanical properties and microstructures of creep aged 2124 aluminum alloy  

工艺参数对蠕变时效2124铝合金力学性能和微观组织的影响(英文)

作　　者：湛利华[1,2] 李炎光[1,2] 黄明辉[1,2] 

机构地区：[1]中南大学国家高性能复杂制造重点实验室,长沙410083 [2]中南大学机电工程学院,长沙410083

出　　处：《Transactions of Nonferrous Metals Society of China》2014年第7期2232-2238,共7页中国有色金属学报（英文版）

基　　金：Project(51235010)supported by the National Natural Science Foundation of China;Project(2010CB731700)supported by the National Basic Research Program of China;Project(20120162110003)supported by PhD Programs Foundation of Ministry of Education of China

摘　　要：A series of tests were carried microstructures of 2124 aluminum alloy in increase of aging time, temperature and low-to-peak-to-low manner. No significant out to investigate the effects of process parameters on mechanical properties and creep aging process. The results show that creep strain and creep rate increase with the applied stress. The hardness of specimen varies with aging time and stress in a effect of temperature on hardness of material is seen in the range of 185-195 ℃. The optimum mechanical properties are obtained at the conditions of （200 MPa, 185 ℃, 8 h） as the result of the coexistence of strengthening S＂ and S＇ phases in the matrix by transmission electron microscopy （TEM）. TEM observation shows that applied stress promotes the formation and growth of precioitates and no obvious stress orientation effect is observed in the matrix.研究2124铝合金在蠕变时效过程中工艺参数对力学性能和微观组织的影响。结果表明，蠕变量和蠕变速率随着时效时间、温度、应力的增大而增大。硬度随着时间和应力的增加呈类似于先增加后减小的趋势。在实验温度185～195℃范围内，温度对硬度的影响不大。当蠕变条件为200MPa、185℃、8h时，试样得到最佳的力学性能，此时试样基体内同时存在强化相S＂相和S＇相。透射电镜观察表明外加应力能促进析出相的析出和长大，基体中没有发现明显的应力位向效应。

关 键 词：aluminum alloy creep aging behavior age hardening mechanical property MICROSTRUCTURE process parameter 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TG156.92[金属学及工艺—金属材料]