5083铝合金最佳超塑性变形行为  

Study on the optimal superplastic deformation behavior of 5083 Aluminum alloy

作　　者：柳胜举[1] 徐雪峰[1] 王高潮[1] 张杰刚[2] 

机构地区：[1]南昌航空大学航空制造工程学院,南昌330063 [2]首都航天机械公司,北京100076

出　　处：《塑性工程学报》2013年第4期79-85,共7页Journal of Plasticity Engineering

基　　金：国家自然科学基金资助项目(51075196);南昌航空大学研究生创新基金项目(YC2011)

摘　　要：采用最大m值法研究5083铝合金不同轧制方向的超塑性。在500℃～535℃温度范围内,得到其试样延伸率以及最佳变形温度为525℃,同时对比恒速度法、恒应变速率法在525℃的超塑性能。实验结果表明,5083铝合金轧制后,晶粒产生各向异性,导致不同轧制方向的延伸率有显著差异。在温度500℃、525℃和535℃下采用最大m值法拉伸,其纵向试样延伸率分别为264%、331%、317%,而横向试样延伸率则分别为98%、129%、119%,纵向试样延伸率显著大于横向试样延伸率。在温度525℃下,5083铝合金基于最大m值法的拉伸效果最好,其纵向试样最大延伸率为331%,拉伸时间为3846s;在相同温度下,用恒速度法、恒应变速率法拉伸,其纵向试样最大延伸率分别为316%、302%,而拉伸时间分别为9141s、12602s,最大m值法的延伸率略大于恒速度法、恒应变速率法的延伸率,但最大m值法的拉伸时间较恒速度法和恒应变速率法有大幅缩减。The maximum rn value method was first used to investigate the superplastic properties of 5083 Aluminum alloy along different rolling direction. In 500℃-535℃ temperature range, the elongations of specimens were obtained and the optimal de- formation temperature was 525℃, meanwhile its result was compared with the results of the constant velocity method and the constant strain rate method at 525℃. Experimental results show that, the elongations of 5083 Aluminum alloy were obviously different because of the anisotropy produced by rolling. Tensile test based on the maximum m value method was done at tempera- ture of 500℃, 525℃ and 535℃, the elongations of the longitudinal specimens were individually 264%, 331%, 317%, and the elongation of the transverse specimens were respectively 98%, 129 %, 1190%. The elongation of the longitudinal specimen was significantly greater than that of the transverse specimens. Tensile effect of 5083 Aluminum alloy based on the maximum m value was the best at 525℃, the maximum elongation of the longitudinal samples was 331%, and testing time was 3846s. The maxi mum elongations of the longitudinal samples by the constant velocity method and the constant strain rate method tensile test were individually 316%, 302% at the same temperature, while the testing time were respectively 9141s, 12602s. The elongation of the maximum m value method was slightly larger than the constant velocity method and the constant strain rate method, but tes- ting time had been substantially reduced.

关 键 词：5083铝合金 最大m值法 各向异性 延伸率 

分 类 号：TG146.21[一般工业技术—材料科学与工程]