相同试验应力与材料强度比值下的7150铝合金蠕变时效行为研究  

Creep aging behavior of 7150 aluminum alloy under the same ratio of test stress to material strength

作　　者：童璨瑜 郜阳 王建光 徐凌志 胡蓝 湛利华 徐永谦[1,3,4] TONG Can-yu;GAO Yang;WANG Jian-guang;XU Ling-zhi;HU Lan;ZHAN Li-hua;XU Yong-qian(Light Alloy Research Institute,Central South University,Changsha 410083,China;Shanghai Aerospace Equipments Manufacturer Co.,Ltd.,Shanghai 200245,China;College of Mechanical and Electrical Engineering,Central South University,Changsha 410083,China;State Key Laboratory of High Performance Complex Manufacturing,Central South University,Changsha 410083,China)

机构地区：[1]中南大学轻合金研究院,湖南长沙410083 [2]上海航天设备制造总厂有限公司,上海200245 [3]中南大学机电工程学院,湖南长沙410083 [4]中南大学高性能复杂制造国家重点实验室,湖南长沙410083

出　　处：《塑性工程学报》2021年第5期70-75,共6页Journal of Plasticity Engineering

基　　金：国家重点研发计划项目(2017YFB0306300);国家科技重大专项项目(2017ZX04005001)。

摘　　要：通过改变传统的蠕变试验方案中试验应力采用绝对值的方法,提出将试验应力与材料在时效温度下屈服强度的比值(应力因子)作为施加应力标准的方案。为探索应力因子的影响规律,在130~150℃的时效温度下,分别开展了7150-T77态铝合金不同应力因子(0.3、0.5、0.7)与350 MPa绝对应力下的蠕变时效行为研究。结果表明,随着应力因子的增大,7150-T77态铝合金的蠕变量增大而力学性能有所下降;当应力因子相同时,材料在不同温度下的蠕变量趋于相等。且应力因子的变化会使蠕变量产生显著的差异,说明材料所受应力与其当前屈服强度的比值可能比单一的应力和温度更适合来描述铝合金的蠕变变形行为。The ratio of the test stress to the yield strength of material at aging temperature(stress factor)was proposed as the applied stress instead of absolute stress in the traditional test scheme.To explore the influence law of the stress factor,the creep aging behavior of7150-T77 aluminum alloy was studied under different stress factors(0.3,0.5,0.7)and 350 MPa absolute stress at aging temperature of130-150℃.The results show that as the stress factor increases,the creep deformation of 7150-T77 aluminum alloy increases,but the mechanical properties decrease.When the stress factor is the same,the creep deformation of the material at different temperatures tends to be equal.Moreover,the change of the stress factor can cause a significant difference in the creep deformation,which indicates that the ratio of the stress to the current yield strength of the material may be more suitable to describe the creep deformation behavior of the aluminum alloy rather than a single stress and temperature.

关 键 词：蠕变时效 7150铝合金 应力因子 蠕变量 力学性能 

分 类 号：TG1[金属学及工艺—金属学]