Microstructure and Joining Properties of High Nb-containing TiAl Alloy Brazed Joints

Xiaoguo Song; Xiaoqing Si; Jian Cao; Zhiquan Wang; Hongyun Zhao; Jicai Feng

Microstructure and Joining Properties of High Nb-containing TiAl Alloy Brazed Joints

Xiaoguo Song^*
, Xiaoqing Si
, Jian Cao
, Zhiquan Wang
, Hongyun Zhao
, Jicai Feng

^*Corresponding author for this work

Harbin Institute of Technology

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

12 Scopus citations

Abstract

High Nb-containing TiAl alloy (Ti-45Al-8.5Nb-(W, B, Y) (at%), abbreviated as TAN alloy) was brazed at 1100℃ using Ti-28Ni (wt%) eutectic brazing alloy. The typical interfacial microstructure was TAN/τ₃-Al₃Ti₂Ni+B2/α₂-Ti₃Al layer/α₂-Ti₃Al + δ-Ti₂Ni/α₂-Ti₃Al layer/τ₃-Al₃Ti₂Ni + B2/TAN. The effects of holding time on interfacial microstructure and joining properties of TAN brazed joints were investigated. The results demonstrate that the diffusion of Ni from molten brazing alloy to TAN substrate plays an important role in the interfacial microstructure evolution, which results in an increase of diffusion zone and a reduction of brazed seam with the prolongation of holding time. Shear test indicates that the maximum shear strength at room temperature and high temperature (600℃) reaches 248.6 MPa and 166.4 MPa, respectively when holding time is 15 min. Fracture analyses reveal that brittle fracture prefers to initiate and propagate in the continuous intermetallic layers during shear test.

Translated title of the contribution	高铌TiAl合金钎焊接头组织和性能研究
Original language	English
Pages (from-to)	52-58
Number of pages	7
Journal	Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering
Volume	47
Issue number	1
State	Published - 1 Jan 2018

Keywords

Brazing
Fracture
Mechanical properties
Microstructure
TiAl intermetallic

Cite this

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title = "Microstructure and Joining Properties of High Nb-containing TiAl Alloy Brazed Joints",

abstract = "High Nb-containing TiAl alloy (Ti-45Al-8.5Nb-(W, B, Y) (at\%), abbreviated as TAN alloy) was brazed at 1100℃ using Ti-28Ni (wt\%) eutectic brazing alloy. The typical interfacial microstructure was TAN/τ3-Al3Ti2Ni+B2/α2-Ti3Al layer/α2-Ti3Al + δ-Ti2Ni/α2-Ti3Al layer/τ3-Al3Ti2Ni + B2/TAN. The effects of holding time on interfacial microstructure and joining properties of TAN brazed joints were investigated. The results demonstrate that the diffusion of Ni from molten brazing alloy to TAN substrate plays an important role in the interfacial microstructure evolution, which results in an increase of diffusion zone and a reduction of brazed seam with the prolongation of holding time. Shear test indicates that the maximum shear strength at room temperature and high temperature (600℃) reaches 248.6 MPa and 166.4 MPa, respectively when holding time is 15 min. Fracture analyses reveal that brittle fracture prefers to initiate and propagate in the continuous intermetallic layers during shear test.",

keywords = "Brazing, Fracture, Mechanical properties, Microstructure, TiAl intermetallic",

author = "Xiaoguo Song and Xiaoqing Si and Jian Cao and Zhiquan Wang and Hongyun Zhao and Jicai Feng",

year = "2018",

month = jan,

day = "1",

language = "英语",

volume = "47",

pages = "52--58",

journal = "Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering",

issn = "1002-185X",

publisher = "Science Press ",

number = "1",

}

TY - JOUR

T1 - Microstructure and Joining Properties of High Nb-containing TiAl Alloy Brazed Joints

AU - Song, Xiaoguo

AU - Si, Xiaoqing

AU - Cao, Jian

AU - Wang, Zhiquan

AU - Zhao, Hongyun

AU - Feng, Jicai

PY - 2018/1/1

Y1 - 2018/1/1

N2 - High Nb-containing TiAl alloy (Ti-45Al-8.5Nb-(W, B, Y) (at%), abbreviated as TAN alloy) was brazed at 1100℃ using Ti-28Ni (wt%) eutectic brazing alloy. The typical interfacial microstructure was TAN/τ3-Al3Ti2Ni+B2/α2-Ti3Al layer/α2-Ti3Al + δ-Ti2Ni/α2-Ti3Al layer/τ3-Al3Ti2Ni + B2/TAN. The effects of holding time on interfacial microstructure and joining properties of TAN brazed joints were investigated. The results demonstrate that the diffusion of Ni from molten brazing alloy to TAN substrate plays an important role in the interfacial microstructure evolution, which results in an increase of diffusion zone and a reduction of brazed seam with the prolongation of holding time. Shear test indicates that the maximum shear strength at room temperature and high temperature (600℃) reaches 248.6 MPa and 166.4 MPa, respectively when holding time is 15 min. Fracture analyses reveal that brittle fracture prefers to initiate and propagate in the continuous intermetallic layers during shear test.

AB - High Nb-containing TiAl alloy (Ti-45Al-8.5Nb-(W, B, Y) (at%), abbreviated as TAN alloy) was brazed at 1100℃ using Ti-28Ni (wt%) eutectic brazing alloy. The typical interfacial microstructure was TAN/τ3-Al3Ti2Ni+B2/α2-Ti3Al layer/α2-Ti3Al + δ-Ti2Ni/α2-Ti3Al layer/τ3-Al3Ti2Ni + B2/TAN. The effects of holding time on interfacial microstructure and joining properties of TAN brazed joints were investigated. The results demonstrate that the diffusion of Ni from molten brazing alloy to TAN substrate plays an important role in the interfacial microstructure evolution, which results in an increase of diffusion zone and a reduction of brazed seam with the prolongation of holding time. Shear test indicates that the maximum shear strength at room temperature and high temperature (600℃) reaches 248.6 MPa and 166.4 MPa, respectively when holding time is 15 min. Fracture analyses reveal that brittle fracture prefers to initiate and propagate in the continuous intermetallic layers during shear test.

KW - Brazing

KW - Fracture

KW - Mechanical properties

KW - Microstructure

KW - TiAl intermetallic

UR - https://www.scopus.com/pages/publications/85052711871

M3 - 文章

AN - SCOPUS:85052711871

SN - 1002-185X

VL - 47

SP - 52

EP - 58

JO - Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering

JF - Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering

IS - 1

ER -

Microstructure and Joining Properties of High Nb-containing TiAl Alloy Brazed Joints

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