镁合金与钛合金的瞬间液相扩散焊  

Transient Liquid Phase Bonding of Magnesium Alloy (AZ31B) and Titanium Alloy (Ti6Al4V) Using Aluminium Interlayer

作　　者：熊江涛[1] 张赋升[1] 李京龙[1] 黄为东[1] 

机构地区：[1]西北工业大学材料学院,陕西西安710072

出　　处：《稀有金属材料与工程》2006年第10期1677-1680,共4页Rare Metal Materials and Engineering

摘　　要：为实现镁合金AZ31B与钛合金Ti6A14V的可靠连接，研究了两者以Al为中间层的瞬间液相扩散焊接头的微观结构与连接强度。研究结果表明：当焊接时间为180min时，焊接温度是影响界面反应热力学与动力学的主要参数，其对接头的微观组织、接头界面新生相构成与连接强度有重要影响。保温温度低于450℃时，AZ3IB／AI界面无液相产生，无法实现AZ31B与Ti6A14V的可靠连接；保温温度在450℃～480℃变化时，温度对AZ31B／Al／Ti6A14V界面反应的动力学因素有明显影响，且直接决定了焊后接头新生相的构成与分布。470℃保温180min的接头剪切强度较高（72．4MPa），达到AZ31B母材（86MPa）的84．2％。The microstructure and mechanical properties of transient liquid phase （TLP） joint, which was formed by bonding magnesium alloy （AZ31B） to titanium alloy （Ti6AI4V） using aluminium interlayer, have been investigated, When bonding time was 180 min, products of interracial reactions, microstructure of joint and bonding strength depended on bonding temperature. When bonding temperature was lower than 450℃, the temperature or composition of AZ31B/AI interface couldn＇t satisfy prerequisites of Mg-AI eutectic reaction, then no liquid phase was produced in the joint and bonding of AZ31B and Ti6AI4V was difficult to be realized. In the process of bonding temperature variation from 450℃ to 480℃, The temperature had great effect on kinetic factors of AZ31B/AI/Ti6AI4V interfacial reaction, which decided the composition and distribution of the reaction product. The joint shear strength of 72.4 MPa which is 84.2% of AZ31B strength （82.4 MPa） can be achieved after bonding at 470℃ for 180 min.

关 键 词：扩散焊 钛合金 镁合金 

分 类 号：TG453.9[金属学及工艺—焊接]