摘要
通过Gleeble3500热模拟试验机研究了变形温度和应变速率对挤压态6082-T6铝合金高温拉伸力学性能的影响,采用光学显微镜(OM)、扫描电镜(SEM)和透射电镜(TEM)分析了合金在高温拉伸过程中的微观组织演变。结果表明:在恒定的应变速率下,挤压态6082-T6铝合金的拉伸强度随着拉伸温度的升高而下降;在恒定的拉伸温度下,其拉伸强度随着应变速率的升高而上升。挤压态6082-T6铝合金在高温(300~450℃)拉伸条件下表现为韧性断裂,在较高的变形温度和较低应变速率条件下,合金的韧窝增大且更深,表现出较好的塑性。在高温变形过程中,随着拉伸温度的升高,合金内部的位错密度下降,并出现了析出相粗化现象,导致合金的变形抗力下降。
Effects of deformation temperature and strain rate on high-temperature tensile mechanical properties of extruded 6082-T6 aluminum alloy were studied using a Gleeble3500 thermal simulation testing machine.Microstructure evolution of the alloy during high-temperature tensile was analyzed using optical microscope(OM),scanning electron microscopy(SEM)and transmission electron microscopy(TEM).The results show that at a constant strain rate,the tensile strength of the extruded 6082-T6 aluminum alloy decreases with the increase of tensile temperature.At a constant tensile temperature,its tensile strength increases with the increase of strain rate.The extruded 6082-T6 aluminum alloy exhibits ductile fracture under high temperature(300-450℃)tensile conditions.At higher deformation temperatures and lower strain rates,the dimples of the alloy increase and become deeper,exhibiting good plasticity.During the high-temperature deformation process,as the tensile temperature increases,the dislocation density inside the alloy decreases,and there is a coarsening phenomenon of precipitates,resulting in a decrease in the deformation resistance of the alloy.
作者
叶拓
邱飒蔚
刘杰
岳焕宇
刘伟
吴远志
YE Tuo;QIU Sa-wei;LIU Jie;YUE Huan-yu;LIU Wei;WU Yuan-zhi(School of Intelligent Manufacturing and Mechanical Engineering,Hunan Institute of Technology,Hengyang 421002,China;Research Institute of Automobile Parts Technology,Hunan Institute of Technology,Hengyang 421002,China)
出处
《材料热处理学报》
CAS
CSCD
北大核心
2024年第3期113-120,共8页
Transactions of Materials and Heat Treatment
基金
国家自然科学基金(52201074,52171115)
湖南省教育厅科学研究项目(22A0626)
国家级大学生创新创业训练计划平台项目(S202311528020,S202311528045)。
关键词
6082-T6铝合金
高温拉伸
显微组织
力学性能
6082-T6 aluminum alloy
high temperature tensile
microstructure
mechanical property
