QAl10-4-4/TC6双金属连接界面组织与力学性能分析

Analysis of Bonding Interfacial Microstructure and Mechanical Properties of QAl10-4-4/TC6 Bimetal

铜合金/钛合金双金属材料能发挥各自的性能优势,兼具轻质、耐磨、高强等优异性能。本文通过真空热压扩散法连接QAl10-4-4铝青铜和TC6钛合金,并采用显微组织观察和剪切强度测试等方法,研究了直接连接和添加AgCuZnCd连接的QAl10-4-4/TC6双金属的界面组织和力学性能,探究了连接参数与中间层对QAl10-4-4/TC6双金属连接质量的影响规律,分析了双金属界面过渡层形成机理,建立了连接工艺-界面组织-力学性能的内在关联。结果表明:直接扩散连接的QAl10-4-4/TC6双金属连接质量较差,生成的金属间化合物导致界面上生长了贯穿长裂纹,剪切强度仅有21 MPa;添加AgCuZnCd连接QAl10-4-4/TC6双金属后界面金属间化合物减少,当连接温度为850℃时,界面剪切强度最大为178.19 MPa,温度超过850℃时,双金属界面强度迅速降低。

Copper alloy/titanium alloy bimetallic materials can leverage their respective performance advantages,which possess excellent properties such as lightweight,wear-resistant and high-strength.This article bonded QAl10-4-4 aluminum bronze and TC6 titanium alloy of vacuum hot press diffusion bonding,studied the interfacial microstructure and mechanical properties of QAl10-4-4/TC6 bimetals that directly bonded and bonded with AgCuZnCd through microstructural observation and shear strength test,and explored the influence law of bond parameters and intermediate layers on QAl10-4-4/TC6 bimetallic bond quality,then analyzed the formation mechanism of the bimetallic interface transition layer.At last,this paper established internal correlation between bonding process-interface microstructure-mechanical properties.The results showed that the quality of QAl10-4-4/TC6 bimetallic with direct diffusion bonding was poor.Intermetallic led to the growth of through long cracks at the interface and the interface shear strength was only 21 MPa.Intermetallic reduced after bonding QAl10-4-4/TC6 bimetal with AgCuZnCd.The maximum interface shear strength was 177.9 MPa at 850℃.The residual internal stress and cracks between interfaces increased as the temperature exceeded 835℃,as a result,the bimetallic interface strength decreased rapidly.The strength of the bimetallic interface decreased rapidly as the temperature exceeded 850℃.