TY - JOUR
T1 - Phase evolution of diffusion bonding interface between high Nb containing TiAl alloy and Ni-Cr-W superalloy
AU - Qi, Xiansheng
AU - Xue, Xiangyi
AU - Tang, Bin
AU - Kou, Hongchao
AU - Hu, Rui
AU - Li, Jinshan
N1 - Publisher Copyright:
Copyright © 2015, Northwest Institute for Nonferrous Metal Research. Published by Elsevier BV. All rights reserved.
PY - 2015/7/1
Y1 - 2015/7/1
N2 - 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, Ni2AlTi, Ni3Ti, (NiCr)ss (ss represents solid solution), γ phase, while the interfacial phases of joint with Ti/Cu interlayers consist of Ti3Al, Tiss, Ti2Ni, rich Cu-NiAlTi, α2-Wss, Ni2AlTi, (NiCr)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.
AB - 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, Ni2AlTi, Ni3Ti, (NiCr)ss (ss represents solid solution), γ phase, while the interfacial phases of joint with Ti/Cu interlayers consist of Ti3Al, Tiss, Ti2Ni, rich Cu-NiAlTi, α2-Wss, Ni2AlTi, (NiCr)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.
KW - Diffusion bonding
KW - High Nb containing TiAl alloy
KW - Ni-Cr-W superalloy
KW - Phase evolution
UR - http://www.scopus.com/inward/record.url?scp=84940367904&partnerID=8YFLogxK
M3 - 文章
AN - SCOPUS:84940367904
SN - 1002-185X
VL - 44
SP - 1575
EP - 1580
JO - Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering
JF - Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering
IS - 7
ER -