Fast epitaxial brazing of DD6 single crystal superalloy using novel NiCoCrAlNbTi high entropy filler alloy

被引：7

作者：

Ren, Xinyu ^{[1
]}

Li, Wenwen ^{[1
]}

Xiong, Huaping ^{[1
]}

Ren, Haishui ^{[1
]}

Jing, Yongjuan ^{[1
]}

Mao, Wei ^{[1
]}

机构：

[1] Beijing Inst Aeronaut Mat, Welding & Plast Forming Div, Beijing 100095, Peoples R China

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2024年 / 985卷

基金：

中国国家自然科学基金;

关键词：

Single crystal superalloy; Epitaxial brazing; High entropy filler; EBSD; TENSILE BEHAVIOR; EVOLUTION; PRECIPITATION; JOINTS;

D O I：

10.1016/j.jallcom.2024.174082

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

In recent years, Ni-based single crystal superalloys are widely applied in the fabrication of blades and vanes in aero-engine industry due to the excellent high temperature properties. In this study, a novel high entropy filler without Si and B was proposed. The melting point of the newly developed Ni-Co-Cr-Al-Nb-Ti filler was 1155 degrees C and fast epitaxial brazing DD6 single crystal superalloy was realized under the brazing condition of 1200 degrees C for 30 min. Furthermore, the influence of aging heat treatment on the interface microstructure and joint strength was investigated. The as-brazed joint interface mainly consisted of gamma, gamma', gamma"-(Ni,Co,Cr)3Nb and NiAl phase. After aging treatment, element distribution became more uniform and the size of intermetallic phase was refined. The gamma+gamma' phase in brazing seam exhibits same [001] orientation with DD6 substrate. The orientation relationship between gamma and gamma" was also analyzed. The joint tensile strength tested at 980 degrees C was 559 MPa.

引用

页数：8

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