热变形参数对LD7铝合金流动应力的影响  

Influence of thermo-deformation parameters on the flow stress of LD7 aluminum alloy

作　　者：刘芳[1] 单德彬[1] 吕炎[1] 

机构地区：[1]哈尔滨工业大学材料科学与工程学院,黑龙江哈尔滨150001

出　　处：《材料科学与工艺》2003年第1期55-58,共4页Materials Science and Technology

基　　金：教育部留学回国人员科研启动基金资助项目;黑龙江省博士后启动基金资助项目.

摘　　要：在Gleeble-1500热模拟试验机上对LD7铝合金试样在变形程度为60%,变形温度为360～480℃、变形速率为0 01～1s-1的条件下进行等温压缩试验,得到了不同应变、不同变形温度和应变速率下材料的真实应力,并利用古布金公式对实验结果进行了摩擦修正.研究结果表明:LD7铝合金是动态回复型合金;合金的流动应力随温度的升高而降低,最佳变形温度是400～450℃;该材料对应变速率具有很高的敏感性.A series of thermocompression experiments were conducted with LD7 aluminum alloy specimens on the Gleeble-1500 thermal simulator over a wide range of temperatures (360～480 ℃) with strain rates within 001～1 s-1 and the largest deformation being 60% to obtain real stress of the material, and the correction was performed to eliminate the frictional influence. The experimental results show that the LD7 aluminum alloy was a kind of dynamic recovery alloys. The flow stress declines with the increase of temperature, and the best deformation temperature was between 400 ℃ and 450 ℃. And, finally, the alloy is very sensitive to the strain rate.

关 键 词：LD7铝合金 热变形参数 流动应力 热压缩 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TG113.25[金属学及工艺—金属材料]