高Nb-TiAl合金/Ni-Cr-W高温合金扩散连接界面相演化（英文）  

Phase Evolution of Diffusion Bonding Interface between High Nb Containing TiAl Alloy and Ni-Cr-W Superalloy

作　　者：齐先胜[1] 薛祥义[1] 唐斌[1] 寇宏超[1] 胡锐[1] 李金山[1] 

机构地区：[1]西北工业大学凝固技术国家重点实验室,陕西西安710072

出　　处：《稀有金属材料与工程》2015年第7期1575-1580,共6页Rare Metal Materials and Engineering

基　　金：National Key Basic Research Development Program of China(2011CB605502);Program of Introducing Talents of Discipline to Universities(08040)

摘　　要：在1000℃-50 MPa-60 min条件下对高Nb-Ti Al和Ni-Cr-W高温合金进行了扩散连接,通过光学显微镜(OM)、扫描电子显微镜(SEM)、能谱仪(EDS)和X射线衍射仪(XRD)对扩散连接界面处显微组织及相组成进行了分析。研究结果表明,未添加中间层时,高Nb-Ti Al合金/Ni-Cr-W高温合金扩散连接接头处的相组成为γ-Ti Al、Ni2Al Ti、Ni3Ti、(Ni Cr)ss相、γ相。而高Nb-Ti Al合金/Ti/Cu/Ni-Cr-W高温合金扩散连接接头处的相组成为Ti3Al、Tiss、Ti2Ni、rich Cu-Ni Al Ti、α2-Wss、Ni2Al Ti、(Ni Cr)ss相、γ相。此外,由于Cr和W的扩散速度较慢,Cr和W原子主要偏聚在靠近Ni-Cr-W高温合金的区域。Ti/Cu箔的加入有利于界面处元素的扩散和反应,可以有效避免微裂纹的产生。The diffusion bonding between high Nb containing TiAl alloy and Ni-Cr-W superalloy was carried out under the condition of 1000 ℃-50 MPa-60 min.The microstructure and the composition of diffusion bonding interface were characterized by optical microscope（OM）, scanning electron microscope（SEM）, energy disperse spectroscopy（EDS） and X-Ray diffraction（XRD）.The phase evolutions of bonds with and without Ti/Cu interlayers were analyzed.The results indicate that the interfacial phases of high Nb containing TiAl alloy/Ni-Cr-W superalloy joint consist of γ-TiAl, Ni2 AlTi, Ni3 Ti,（Ni Cr）ss（ss represents solid solution）, γ phase, while the interfacial phases of joint with Ti/Cu interlayers consist of Ti3 Al, Tiss, Ti2 Ni, rich Cu-Ni AlTi, α2-Wss, Ni2 AlTi,（Ni Cr）ss, γ phase.Besides, Cr and W atoms are concentrated in the zone near Ni-Cr-W superalloy because their diffusion is difficult.Ti/Cu foils can promote diffusion and reaction; therefore the micro-cracks in the bonded joint will be avoided efficiently.

关 键 词：高Nb-TiAl合金 Ni-Cr-W高温合金 扩散连接 相演化 

分 类 号：TG495[金属学及工艺—焊接]