Study on the Microstructures and Properties of 70% SiCp/Al Composites Joints Brazed with Titanium Foam/AlSiMg Composite Filler Metal

被引：0
|
作者：
Li J. [1 ,2 ,3 ]
Chang Z. [1 ]
Zhao H. [1 ]
Li L. [2 ]
Zhang Y. [1 ]
Tu Q. [2 ]
Qin Q. [1 ]
He P. [3 ]
机构：
[1] Key Laboratory of Light Metal Materials Processing Technology of Guizhou Province, Guizhou Institute of Technology, Guiyang
[2] AECC Guizhou Liyang Aero-Engine Co., Ltd., Guiyang
[3] State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin
来源：
Jixie Gongcheng Xuebao/Journal of Mechanical Engineering | 2023年 / 59卷 / 14期
关键词：
brazing; composites; interfacial microstructure; mechanical property; titanium foam;
D O I：
10.3901/JME.2023.14.092
中图分类号：
学科分类号：
摘要：
Aiming at the poor processability of the high-volume SiCp/Al composites, the brazing of 70% SiCp/Al composites with Ti foam/AlSiMg composite filler metal has been studied. The effects of brazing temperature, holding time and welding pressure on the microstructures and properties are investigated. The results show that the joint having the maximum shear strength of 119 MPa is brazed at 700 ℃, 60 min and 10 MPa. The fracture occurs on the composites, and there are a large number of dimples in the fracture surface which shows the characteristics of ductile fracture. Ti7Al5Si12 can generate at not less than 650 ℃. The holding time has a certain influence on the joints’ microstructure. Ti7Al5Si12 preferentially forms at the interface, and then Ti(Al, Si)3 generates. Ti7Al5Si12 tends to be broken and loose with the continuation of the insulation process. The joint kept for 60 min at 700 ℃ has the maximum shear strength, whose interface structure is “Composite/Ti7Al5Si12/mixed layer/Ti7Al5Si12/Composite”. The brazing pressure does not affect the microstructure of the joints, but it affects thickness, density and bonding strength. It can improve the mechanical properties of the joints by increasing the pressure under the condition of ensuring the integrity of the workpieces. © 2023 Editorial Office of Chinese Journal of Mechanical Engineering. All rights reserved.
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页码：92 / 105
页数：13
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