稀土Y对Ti-48Al-2Nb-2Cr合金高温抗氧化性能的影响  

Effect of Y on Oxidation Resistance of Ti-48Al-2Nb-2Cr Alloys

作　　者：周玉俊[1] 周雪锋[1] 陈光[1] 

机构地区：[1]南京理工大学材料评价与设计教育部工程研究中心,江苏南京210094

出　　处：《热加工工艺》2015年第10期93-96,共4页Hot Working Technology

基　　金：国家973项目(2011CB605504);新金属材料国家重点实验室开放基金项目(2012-ZD01)

摘　　要：采用水冷铜坩埚真空感应悬浮熔炼技术制备了Ti-48Al-2Nb-2Cr合金,研究了稀土元素Y对该合金在750、850℃高温抗氧化性能的影响。结果表明:Y元素的添加,改变了氧化层结构,细化了氧化层颗粒,促使生成一层连续致密、具备保护性能的Al2O3层,减缓了氧化速率,降低了氧化增重,改善了Ti-48Al-2Nb-2Cr合金的抗氧化性能,且氧化过程中基体与氧化层间无开裂剥落现象。Ti-48Al-2Nb-2Cr alloys were prepared by cold crucible induction levitation melting method and the effect of Y on the oxidation resistance at 750 ℃ and 850 ℃ of the alloy were studied.The results show that the oxide multi-layered structures change structure by Y-addition and the oxide particle is refined,which can promote to form continuous and protective Al2O3 layer.Y-containing alloys exhibit better oxidation resistance than Y-free alloy which has significantly lower mass gain,can decrease oxidation rate,then,no spallation and cracking at scale/substrate interface were observed.

关 键 词：TIAL合金 循环氧化 稀土Y 抗氧化性能 

分 类 号：TG146.2[一般工业技术—材料科学与工程]