Investigation on Microstructure and Mechanical Properties of CoCrNi/Ti2AlNb Joints Brazed with Ti-Based Amorphous Filler

Xiaochen Li; Jingxin Xu; Guanheng Han; Wei Fu; Yanyu Song; Yu Lei; Xiaoguo Song; Fei Long; Shengpeng Hu

doi:10.1007/s11661-026-08135-w

Investigation on Microstructure and Mechanical Properties of CoCrNi/Ti₂AlNb Joints Brazed with Ti-Based Amorphous Filler

Xiaochen Li
, Jingxin Xu
, Guanheng Han
, Wei Fu^*
, Yanyu Song
, Yu Lei
, Xiaoguo Song
, Fei Long
, Shengpeng Hu^*

^*Corresponding author for this work

School of Materials Science and Engineering

Harbin Institute of Technology
Harbin Institute of Technology Weihai
Qingdao University of Technology
Henan Academy of Sciences

Research output: Contribution to journal › Article › peer-review

Abstract

Achieving the brazing of CoCrNi medium-entropy alloy and Ti₂AlNb alloy is of great significance for the fabrication of complex high-temperature resistant components in aero-engines. In this study TiZrNiCu filler was used to realize the brazing of the two alloys. The typical interfacial microstructure of the brazed joint is CoCrNi/rich-Cr γ + γ + σ/TiNi + TiNi₃ + Cr + σ/(Ti, Zr)(Ni, Cu)/Ti(Co, Ni)/Ti₂Ni(Al, Nb) + (Ti, Zr)₂(Ni, Cu, Co)/β/Ti₂AlNb. With the increase of brazing temperature and holding time, the content of (Ti, Zr)₂(Ni, Cu, Co) in the joint decreases while the content of β phase increases. However, the concentration of (Ti, Zr)₂(Ni, Cu, Co) increases again accompanied by the formation of new phases such as Ti(Co, Ni)₃ and (Ti, Nb)_ss under extremely high brazing parameters. The joint reaches the highest strength under the parameter of 1040 °C/10 min. The joints mainly fracture at (Ti, Zr)₂(Ni, Cu, Co), Ti₂Ni(Al, Nb) as well as (Ti, Zr)(Ni, Cu) and Ti(Co, Ni), presenting a cleavage fracture mode. Combined with nanoindentation tests, Ti₂Ni(Al, Nb) and (Ti, Zr)₂(Ni, Cu, Co) have the lowest plasticity factors among all phases in the joint, which are prone to cause failure.

Original language	English
Pages (from-to)	1239-1250
Number of pages	12
Journal	Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Volume	57
Issue number	3
DOIs	https://doi.org/10.1007/s11661-026-08135-w
State	Published - Mar 2026

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@article{3b892fa17e414061a430c044282d2739,

title = "Investigation on Microstructure and Mechanical Properties of CoCrNi/Ti2AlNb Joints Brazed with Ti-Based Amorphous Filler",

abstract = "Achieving the brazing of CoCrNi medium-entropy alloy and Ti2AlNb alloy is of great significance for the fabrication of complex high-temperature resistant components in aero-engines. In this study TiZrNiCu filler was used to realize the brazing of the two alloys. The typical interfacial microstructure of the brazed joint is CoCrNi/rich-Cr γ + γ + σ/TiNi + TiNi3 + Cr + σ/(Ti, Zr)(Ni, Cu)/Ti(Co, Ni)/Ti2Ni(Al, Nb) + (Ti, Zr)2(Ni, Cu, Co)/β/Ti2AlNb. With the increase of brazing temperature and holding time, the content of (Ti, Zr)2(Ni, Cu, Co) in the joint decreases while the content of β phase increases. However, the concentration of (Ti, Zr)2(Ni, Cu, Co) increases again accompanied by the formation of new phases such as Ti(Co, Ni)3 and (Ti, Nb)ss under extremely high brazing parameters. The joint reaches the highest strength under the parameter of 1040 °C/10 min. The joints mainly fracture at (Ti, Zr)2(Ni, Cu, Co), Ti2Ni(Al, Nb) as well as (Ti, Zr)(Ni, Cu) and Ti(Co, Ni), presenting a cleavage fracture mode. Combined with nanoindentation tests, Ti2Ni(Al, Nb) and (Ti, Zr)2(Ni, Cu, Co) have the lowest plasticity factors among all phases in the joint, which are prone to cause failure.",

author = "Xiaochen Li and Jingxin Xu and Guanheng Han and Wei Fu and Yanyu Song and Yu Lei and Xiaoguo Song and Fei Long and Shengpeng Hu",

note = "Publisher Copyright: {\textcopyright} The Minerals, Metals \& Materials Society and ASM International 2026.",

year = "2026",

month = mar,

doi = "10.1007/s11661-026-08135-w",

language = "英语",

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TY - JOUR

T1 - Investigation on Microstructure and Mechanical Properties of CoCrNi/Ti2AlNb Joints Brazed with Ti-Based Amorphous Filler

AU - Li, Xiaochen

AU - Xu, Jingxin

AU - Han, Guanheng

AU - Fu, Wei

AU - Song, Yanyu

AU - Lei, Yu

AU - Song, Xiaoguo

AU - Long, Fei

AU - Hu, Shengpeng

PY - 2026/3

Y1 - 2026/3

N2 - Achieving the brazing of CoCrNi medium-entropy alloy and Ti2AlNb alloy is of great significance for the fabrication of complex high-temperature resistant components in aero-engines. In this study TiZrNiCu filler was used to realize the brazing of the two alloys. The typical interfacial microstructure of the brazed joint is CoCrNi/rich-Cr γ + γ + σ/TiNi + TiNi3 + Cr + σ/(Ti, Zr)(Ni, Cu)/Ti(Co, Ni)/Ti2Ni(Al, Nb) + (Ti, Zr)2(Ni, Cu, Co)/β/Ti2AlNb. With the increase of brazing temperature and holding time, the content of (Ti, Zr)2(Ni, Cu, Co) in the joint decreases while the content of β phase increases. However, the concentration of (Ti, Zr)2(Ni, Cu, Co) increases again accompanied by the formation of new phases such as Ti(Co, Ni)3 and (Ti, Nb)ss under extremely high brazing parameters. The joint reaches the highest strength under the parameter of 1040 °C/10 min. The joints mainly fracture at (Ti, Zr)2(Ni, Cu, Co), Ti2Ni(Al, Nb) as well as (Ti, Zr)(Ni, Cu) and Ti(Co, Ni), presenting a cleavage fracture mode. Combined with nanoindentation tests, Ti2Ni(Al, Nb) and (Ti, Zr)2(Ni, Cu, Co) have the lowest plasticity factors among all phases in the joint, which are prone to cause failure.

AB - Achieving the brazing of CoCrNi medium-entropy alloy and Ti2AlNb alloy is of great significance for the fabrication of complex high-temperature resistant components in aero-engines. In this study TiZrNiCu filler was used to realize the brazing of the two alloys. The typical interfacial microstructure of the brazed joint is CoCrNi/rich-Cr γ + γ + σ/TiNi + TiNi3 + Cr + σ/(Ti, Zr)(Ni, Cu)/Ti(Co, Ni)/Ti2Ni(Al, Nb) + (Ti, Zr)2(Ni, Cu, Co)/β/Ti2AlNb. With the increase of brazing temperature and holding time, the content of (Ti, Zr)2(Ni, Cu, Co) in the joint decreases while the content of β phase increases. However, the concentration of (Ti, Zr)2(Ni, Cu, Co) increases again accompanied by the formation of new phases such as Ti(Co, Ni)3 and (Ti, Nb)ss under extremely high brazing parameters. The joint reaches the highest strength under the parameter of 1040 °C/10 min. The joints mainly fracture at (Ti, Zr)2(Ni, Cu, Co), Ti2Ni(Al, Nb) as well as (Ti, Zr)(Ni, Cu) and Ti(Co, Ni), presenting a cleavage fracture mode. Combined with nanoindentation tests, Ti2Ni(Al, Nb) and (Ti, Zr)2(Ni, Cu, Co) have the lowest plasticity factors among all phases in the joint, which are prone to cause failure.

UR - https://www.scopus.com/pages/publications/105029166304

U2 - 10.1007/s11661-026-08135-w

DO - 10.1007/s11661-026-08135-w

M3 - 文章

AN - SCOPUS:105029166304

SN - 1073-5623

VL - 57

SP - 1239

EP - 1250

JO - Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science

JF - Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science

IS - 3

ER -

Investigation on Microstructure and Mechanical Properties of CoCrNi/Ti₂AlNb Joints Brazed with Ti-Based Amorphous Filler

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