5083铝合金的高温应变速率循环超塑性  

Superplasticity of 5083 Aluminum Alloy Induced by Strain Rate Cycling at High Temperatures

作　　者：葛永成[1] 徐雪峰[2] 张杰刚[3] 

机构地区：[1]东南大学成贤学院,南京210088 [2]南昌航空大学航空制造工程学院,南昌330063 [3]首都航天机械公司,北京100076

出　　处：《机械工程材料》2014年第8期97-100,共4页Materials For Mechanical Engineering

基　　金：国家自然科学基金资助项目(51075196);江西省教育厅基金资助项目(GJJ12451)

摘　　要：采用应变速率循环法、恒速度法、恒应变速率法,在450,475,500℃下分别对切割面粗糙度不同的5083铝合金进行拉伸,研究了温度、拉伸方式、切割面粗糙度对其超塑性的影响以及应变速率循环法拉伸后的显微组织。结果表明:5083铝合金经上述三种方式拉伸后,其最大伸长率分别为131%,108%,149%,分别对应最佳变形温度为475℃,500℃,500℃,而且线切割面粗糙试样的伸长率均低于线切割面光滑试样的;在应变速率循环法拉伸时,随着变形温度的升高,5083铝合金的原始长条状组织逐渐断裂并变短,最后变成等轴组织。The 5083 aluminum alloy specimens with different roughnesses of cutting surtace were testea on a tensile tester using the strain rate cycling method, the constant strain rate method and the constant velocity method at 450,475℃ and 500 C. The influences of temperature, tensile methods and roughness of cutting surface on the superplasticity of the alloy as well as the microstructure of the alloy after tensile test in strain rate cycling method were studied. The results show that the optimal elongations of the 5083 aluminum alloy through the three tensile methods were respectively 131G at 475 ℃, 108% at 500 ℃, and 145% at 500 ℃. And the elongations of the samples with rough surface were much less than those of the samples with smooth cutting surface. In the strain rate cycling method tensile test, the original strip structure of 5083 aluminum alloy began to fracture and tended to be shorter, and eventually became an equiaxed structure with the increase of deformation temperature.

关 键 词：5083铝合金 应变速率循环法 超塑性 拉伸试验 

分 类 号：TG146.21[一般工业技术—材料科学与工程]