HIGH TEMPERATURE RHEOLOGICAL BEHAVIOR OF FSJ JOINTED REGION FOR 7022ALUMINUM ALLOY  

作　　者：汪洪峰 左敦稳 汪建利 段杏林 缪宏 

机构地区：[1]College of Information and Engineering,Huangshan University [2]College of Mechanical and Electrical Engineering,Nanjing University of Aeronautics and Astronautics

出　　处：《Transactions of Nanjing University of Aeronautics and Astronautics》2013年第1期62-66,共5页南京航空航天大学学报（英文版）

基　　金：Supported by the National Natural Science Foundation of China(51175255);the University Natural Science Foundation of Anhui Province(KJ2012Z388);the Scientific Research Starting Foundation for Talent of Huang-shan University(2012xkjq001)

摘　　要：The Hopkinson pressure bar tests for base metal and friction stir jointing ( FSJ ) jointed region of 7022aluminum alloy are carried out at different temperatures and strain rates.The temperature is 30 - 400°C and the strain rate is 1 200 - 5 000s -1 .High strain rate for base metal and FSJ jointed region of 7022aluminum alloy are studied.The corresponding stress-strain curves are obtained.The results show that the flow stresses of base metal and FSJ jointed region of 7022aluminum alloy decline with the increase of temperature and increase with the increase of strain rate.Furthermore , the constitutive equation for base metal and FSJ jointed region of 7022aluminum alloy at high temperature and high strain rate is obtained based on Johnson-Cook model.The Hopkinson pressure bar tests for base metal and friction stir jointing（FSJ） jointed region of 7022 a- luminum alloy are carried out at different temperatures and strain rates. The temperature is 30--400 ℃ and the strain rate is 1 200-5 000 s 1. High strain rate for base metal and FSJ jointed region of 7022 aluminum alloy are studied. The corresponding stress-strain curves are obtained. The results show that the flow stresses of base metal and FSJ jointed region of 7022 aluminum alloy decline with the increase of temperature and increase with the in- crease of strain rate. Furthermore, the constitutive equation for base metal and FSJ jointed region of 7022 alumi- num alloy at high temperature and high strain rate is obtained based on Johnson-Cook model.

关 键 词：7022aluminum alloy friction stir jointing ( FSJ ) Hopkinson pressure bar test constitutive equation of stress-strain 

分 类 号：TG146.2[一般工业技术—材料科学与工程]