置氢Ti-6Al-4V钛合金的热压缩变形行为研究  

Deformation behavior in the isothermal compression of hydrogenated Ti-6Al-4V alloy

作　　者：张伟福[1] 李淼泉[1] 林莺莺[1] 

机构地区：[1]西北工业大学材料学院,西安710072

出　　处：《塑性工程学报》2008年第6期107-112,共6页Journal of Plasticity Engineering

基　　金：国家自然科学基金资助项目(50371068);航空基金资助项目(04H53058);国防"973"资助项目

摘　　要：通过热模拟压缩实验，研究了氢对Ti-6Al-4V钛合金热变形行为的影响。结果表明，置氢可以显著降低Ti-6Al-4V钛合金高温压缩时的流动应力，提高Ti-6Al-4V钛合金的热加工变形速率一个数量级以上，并且明显降低了Ti-6Al-4V钛合金的变形温度。在变形温度760℃～800℃范围内，置氢量为0．4wt％的Ti-6Al-4V钛合金的流动应力最小；在变形温度840℃～920℃范围内，置氢量0．2wt％的Ti-6Al-4V钛合金的流动应力最小。同时，置氢前后Ti-6Al-4V钛合金的变形激活能计算结果表明，置氢量为0．4wt％的Ti-6Al-4V钛合金在α＋β两相区的变形激活能为208．3kJ／mol，与未置氢Ti-6Al-4V钛合金相比降低了316kJ／mol。Effect of hydrogen on deformation behavior of the Ti-6Al-4V alloy was investigated through isothermal compression. Addition of hydrogen decreases significantly flow stress, improves strain rate of more than one order of magnitude and decreases significantly deformation temperature of the Ti-6Al-4V alloy. The minimum flow stress of Ti-6Al-4V alloy is at a hydrogen content of 0. 4wt% in the deformation temperature range from 760℃ to 800℃, but the minimum flow stress is at a hydrogen content of 0. 2wt% in the deformation temperature range from 840℃ to 920℃. Meanwhile, apparent activation energy for deformation of the Ti-6Al-4V alloy is 208. 3kJ/mol at a hydrogen content of 0.4wt% in α＋β two-phase field, decreasing 316kJ/mol in comparison with that of the Ti-6Al-4V alloy with natural hydrogen.

关 键 词：TI-6AL-4V钛合金 置氢 流动应力 变形激活能 

分 类 号：TG146.23[一般工业技术—材料科学与工程]