应变速率对室温下90°等通道转角挤压变形工业纯钛拉伸性能的影响  

Effect of Strain Rate on Tensile Properties of Commercial Pure Titanium Processed by ECAP at Room Temperature with a 90° Die

作　　者：刘晓燕[1] 赵西成[1] 杨西荣[1] 张凯[1] 解晨[1] 

机构地区：[1]西安建筑科技大学冶金工程学院,西安710055

出　　处：《机械工程材料》2013年第8期5-8,71,共5页Materials For Mechanical Engineering

基　　金：高等学校博士学科点专项科研基金资助项目(20116120110012);陕西省教育厅专项科研基金资助项目(12JK0430)

摘　　要：采用单向拉伸测试方法,研究了应变速率(0.001 7,0.01,0.1s-1)对室温下经90°等通道转角挤压变形1道次工业纯钛室温拉伸性能的影响,并分析了其断口形貌。结果表明:当应变速率由0.001 7s-1升至0.1s-1时,挤压后工业纯钛的断裂伸长率由17.9%减至14.9%,抗拉强度由780MPa增至926MPa,应变硬化指数由0.07降低到0.04;拉伸断口均为韧窝型韧性断口,且随应变速率的增加韧窝深度变浅。The uniaxial tensile test was applied to investigate the effect of strain rate （0. 001 7,0. 01,0. 1 s 1 ） on the tensile properties and fractography of commercial pure titanium （CP-Ti） fabricated by equal channel angular pressing （ECAP）with one pass deformation at room temperature using a die of 90°. The results show as the strain rate rose from 0. 001 7 s 1 to 0. 1 s-1 , elongation to fracture decreased from 17. 9O/oo to 14.9%, and ultimate tensile strength increased from 780 MPa to 926 MPa, and work hardening exponent reduced from 0. 07 to 0. 04. The fracture surface of CP-Ti exhibited tough fracture of dimple, and dimple became shallow with the increase of strain rate.

关 键 词：等通道转角挤(ECAP) 工业纯钛 应变速率 拉伸性能 

分 类 号：TG146.4[一般工业技术—材料科学与工程]