Vacuum brazing of TZM alloy and graphite with Ti-35Ni alloy: Microstructure, properties, and mechanism

被引：9
作者：
Zhu, Haitao [1 ]
Song, Yanyu [1 ,2 ]
Zhao, Kehan [1 ]
Liu, Duo [1 ,2 ]
Li, Yiran [2 ]
Zhang, Yanzhou [2 ]
Hu, Shengpeng [1 ,2 ]
Song, Xiaoguo [1 ,2 ,3 ]
机构：
[1] Harbin Inst Technol, State Key Lab Adv Welding & Joining, Harbin 150001, Peoples R China
[2] Harbin Inst Technol Weihai, Shandong Prov Key Lab Special Welding Technol, Weihai 264209, Peoples R China
[3] Harbin Inst Technol Weihai, Shandong Inst Shipbldg Technol, Weihai 264209, Peoples R China
来源：
VACUUM | 2023年 / 215卷
基金：
中国国家自然科学基金;
关键词：
TZM alloy; Graphite; Brazing; Interfacial microstructure; Mechanical properties; 1ST WALL; TI; EVOLUTION; SYSTEM; TI-6AL-4V; DESIGN;
D O I：
10.1016/j.vacuum.2023.112368
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
In the present work, a reliable TZM/graphite heterogeneous joint was prepared by vacuum brazing with Ti-35Ni alloy. The influence of brazing temperature on the interfacial microstructure, shear strength, and fracture characteristics of the joints were analyzed. The formation mechanism of the joints was also investigated in detail. TiC layer was formed on graphite during the vacuum brazing process, characterized by SEM and TEM analysis. The interfacial microstructure of the joints brazed at 1200 & DEG;C was TZM/Ti(s,s)/TiNi + Ti2Ni/TiC/graphite. The thickness of TiC layer gradually increased with the increase in brazing temperature. In addition, the shear strength of TZM/graphite heterogeneous joints increased first and then decreased, reaching the peak value of 14.5 MPa at 1300 & DEG;C. Under optimal vacuum brazing temperature, the fracture path of the joint started in the TiC layer and then extended to the interior of the graphite substrate.
引用
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页数：9
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