预时效-温成形工艺参数对7075铝合金组织与性能的影响  

Effect of Pre-aging-Warm Forming Process Parameters on Microstructure and Properties of 7075 Aluminum Alloy

作　　者：张晓蕾 彭则 彭玉青 梁肖 王子健 ZHANG Xiaolei;PENG Ze;PENG Yuqing;LIANG Xiao;WANG Zijian(School of Iron and Steel,Soochow University,Suzhou 215137,China;Jiangxi Hot Stamping Tech Auto Parts Co.,Ltd,Jiujiang 332400,China)

机构地区：[1]苏州大学沙钢钢铁学院,苏州215137 [2]江西豪斯特汽车零部件有限公司,九江332400

出　　处：《机械工程材料》2024年第10期16-20,共5页Materials For Mechanical Engineering

基　　金：国家自然科学基金青年基金资助项目(51905189);材料成形与模具技术国家重点实验室开放课题项目(P2022-006)。

摘　　要：对7075-T6铝合金进行了不同预时效温度(85,100,120℃)、预时效时间(0~32 h)、成形温度(150,200,250,300℃)的预时效-温成形处理,研究了工艺参数对合金组织和性能的影响,确定了最佳工艺参数。结果表明:随着预时效时间延长,7075铝合金晶粒尺寸无明显变化,析出相数量增加,硬度和强度均先增大后减小;相比预时效温度为100,120℃时,预时效温度为85℃时析出相的数量较少,尺寸较小,硬度和强度较大,断后伸长率较小;随着温成形温度升高,硬度和强度均减小;最佳预时效-温成形工艺参数为预时效温度85℃、预时效时间24 h、温成形温度150℃,此时合金综合性能最佳,抗拉强度和断后伸长率分别为T6态的95%和163%;成形后经180℃×30 min烘烤处理可提升其强度、降低塑性。The 7075 aluminum alloy was pre-aged and warm formed at different pre-aging temperatures(85,100,120℃)for different pre-aging times(0-32 h)and forming temperatures(150,200,250,300℃).The effect of process parameters on the microstructure and properties of alloy was studied.The optimum process parameters were determined.The results show that with the extension of pre-aging time,the grain size of 7075 aluminum alloy had no obvious change,the amount of precipitated phase increased,and the hardness and strength increased first and then decreased.Compared with those at pre-aging temperature of 100,120℃,the number and the size of precipitated phases were smaller,the hardness and strength were larger,and the percentage elongation after fracture was smaller at the pre-aging temperature of 85℃.The hardness and strength decreased with the increase of warm forming temperature.The optimum pre-agingwarm forming process parameters were listed as follows:pre-aging temperature of 85℃,pre-aging time of 24 h,and warm forming temperature of 150℃.At this time,the alloy had the best comprehensive properties,which had the tensile strength and percentage elongation after fracture were 95%and 163%of those of the 7075-T6 aluminum alloy,respectively.Baking at 180℃for 30 min after forming could improve the strength and reduce the ductility.

关 键 词：7075铝合金 预时效 温成形 烘烤工艺 

分 类 号：TG146.21[一般工业技术—材料科学与工程]