半固态变形量对Ti14合金热稳定性的影响  

Effect of Semi-Solid Deformation Amount on Thermal Stability of Ti14 Alloy

作　　者：屈可朋[1] 陈永楠[1] 高一帆[2] 魏建锋[1] 赵永庆[3] 王慧[1] 

机构地区：[1]西安交通大学金属材料强度国家重点实验室,陕西西安710049 [2]华东理工大学,上海200237 [3]西北有色金属研究院,陕西西安710016

出　　处：《稀有金属材料与工程》2010年第3期442-446,共5页Rare Metal Materials and Engineering

基　　金：重大基础研究前期研究专项项目(2005CCA06400);国家"973"项目(2007CB613807)

摘　　要：研究新型阻燃钛合金Ti14(α+Ti2Cu)经不同变形量(45%～75%)半固态锻造后的热稳定性能,分析变形量对合金热稳定性能的影响。结果表明:变形量改变析出相的形态及晶粒尺寸,使合金具有不同的热稳定性能。随变形量的增加,Ti14合金热暴露后的强度呈先降低后升高的趋势,塑性有所改善。半固态变形量较小时(45%),合金晶粒粗大,Ti2Cu相呈长条状分布于晶界,高的强度取决于析出相强化作用;随变形量增大(75%),晶粒细化,Ti2Cu相呈颗粒状或短棒状弥散分布,产生细晶强化,使得强度和塑性都得到改善。断口分析表明:变形量较小,断口存在大量撕裂棱;变形量达到75%,断口以韧窝为主;表明析出相和晶粒尺寸共同决定Ti14合金的热稳定性能。The thermal stability of Til4, a novel a＋Ti2Cu burn resistant titanium alloy, after semi-solid forging （SSF） with different deformation amount from 45% to 75% was investigated. Effects of deformation amount on the thermal stability were analyzed. The results show that the deformation amount significantly affects the morphology of precipitates and grain size, leading to change of thermal stability With the deformation amount increasing, the strength of Til4 alloy after thermal exposure decreases first and then increases, and the plasticity was improved. When the deformation amount was 45%, the microstructure consisted of coarse grains and strip-like Ti2Cu precipitates in the grain boundary. As deformation amount increases to 75%, the microstructure changed to refined grains and granular or/and short rod-like Ti2Cu, inducing the improvement of strength and plasticity. Fracture analyses show that the fracture has lots of tearing ridges for small deformation amount; when the deformation amount reaches 75%, the fracture are mainly dimples. It indicates the precipitates and grain size determine the thermal stability of Ti 14 alloy together

关 键 词：TI14合金 半固态 变形量 热稳定性 

分 类 号：TG146.23[一般工业技术—材料科学与工程]