无压烧结制备TiAl合金的致密化工艺研究  

Densification sintering process of TiAl alloy prepared by pressureless sintering

作　　者：李俊涛[1] 郝彦君[2] LI Juntao;HAO Yanjun(School of Mechanical Engineering, Shaanxi Institute of Technology, Xi'an 710300, China;School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081 , China)

机构地区：[1]陕西国防工业职业技术学院机械工程学院,陕西西安710300 [2]北京理工大学材料学院,北京100081

出　　处：《兵器材料科学与工程》2019年第4期87-91,共5页Ordnance Material Science and Engineering

基　　金：陕西国防工业职业技术学院科研规划项目Gfy18-23

摘　　要：以Ti-48Al-2Cr-2Nb预合金粉末为主要原料,进行冷等静压结合无压烧结制备TiAl合金的致密化工艺研究。重点研究预合金粉末粒径、烧结气氛以及其他元素粉末掺杂对TiAl合金显微组织及力学性能的影响,确定最优的工艺参数。结果表明:在800°C以内烧结时,通氢气气氛能显著降低合金的氧化程度;在合金粉中掺杂少量的Al粉能够显著提高合金的致密度,使其具有良好的综合力学性能。Using Ti-48 Al-2 Cr-2 Nb pre-alloyed powder as the main raw material,the densification process of TiAl alloy prepared by cold isostatic pressing combined with pressureless sintering was studied. The effects of particle size,sintering atmosphere and powder doping of other elements on the microstructure and mechanical properties of TiAl alloy were emphatically studied,and the optimum process parameters were determined. The results show that the hydrogen atmosphere can significantly reduce the oxidation degree of the alloy when sintered under 800 ℃. In addition,a small amount of Al powder doped in the alloy powder can significantly increase the density of the alloy and improve comprehensive mechanical properties.

关 键 词：TIAL合金 无压烧结 冷等静压 室温塑性 

分 类 号：TG166.5[金属学及工艺—热处理]