热等静压态TiNiNb合金的热变形行为及微观组织  

Hot deformation behavior and microstructure of hot isostatic pressing TiNiNb alloy

作　　者：刘俊伟[1] 刘军[1] 鲁世强[1] 万俊 徐勇[1] LIU Jun-wei;LIU Jun;LU Shi-qiang;WAN Jun;XU Yong(Key Laboratory for Microstructural Control of Metallic Materials of Jiangxi Province,Nanchang Hangkong University,Nanchang 330063,China)

机构地区：[1]南昌航空大学江西省金属材料微结构调控重点实验室

出　　处：《材料热处理学报》2018年第10期15-22,共8页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金(51504138,51674118);中国航空基金(2016ZF56027);江西省科技支撑计划(20141122040007);江西省自然科学基金(20171BAB206002);江西教育厅科技项目(GJJ150726);江西省金属材料微结构调控重点实验室开放课题(EJ201701515);江西省“百人远航工程”项目和江西省升级研究生教改课题(JXYJG-2016-133)

摘　　要：研究了热等静压态TiNiNb合金的热变形行为,并探究了变形温度及应变速率对其热变形行为的影响,同时建立了本构方程。结果表明：热等静态TiNiNb合金的热变形激活能为200.448 kJ/mol;变形温度及变形速率对热等静压态TiNiNb合金流变应力有显著的影响,峰值应力随变形温度上升而减小,随应变速率上升而增大;将非晶态的预合金粉末经热等静压制成的TiNiNb合金微观组织中可以观察到TiNi基体相,β-Nb相及少量的（Ti,Nb）_2Ni相。在热压缩过程中,变形温度上升、应变速率增加均会使TiNi基体相的含量略微增加,β-Nb相的含量有所减少。The hot deformation behavior of TiNiNb alloys prepared by hot isostatic pressing was investigated, the influence of deformation temperature and strain rate on its hot deformation behavior was investigated, and the constitutive equation was established. The results show that the hot deformation activation energy of the TiNiNb alloy is 200.448 kJ/mol, the deformation temperature and deformation rate have a significant influence on the flow stress of the hot isostatically pressed TiNiNb alloy, and the peak stress decreases with the increase of deformation temperature and increases with the increase of strain rate. The TiNi matrix phase, β-Nb phase and a small amount of（Ti,Nb）_2Ni phase can be observed in the microstructure of the TiNiNb alloy prepared by hot isostatic pressing using amorphous prealloyed powder as raw materials. During hot compression, the content of TiNi matrix phase increases slightly and the content of β-Nb phase decreases slightly with the increase of deformation temperature and strain rate.

关 键 词：TININB合金 微观组织 热变形激活能 高温压缩 本构方程 

分 类 号：TG146.2[一般工业技术—材料科学与工程]