TiZrNiCu钎料钎焊Ti53311S高温钛合金接头界面结构及性能  

Interfacial Microstructure and Properties of Ti53311S Titanium Alloy Joints Brazed Using TiZrNiCu Filler Metal

作　　者：宋晓国[1] 曹健[1] 李兆光[2] 张志伟[2] 冯吉才[1] 

机构地区：[1]哈尔滨工业大学(威海),山东威海264209 [2]北京控制工程研究所,北京100090

出　　处：《稀有金属材料与工程》2013年第8期1694-1698,共5页Rare Metal Materials and Engineering

基　　金：国家重点基础研究发展计划项目(2011CB605505);哈尔滨工业大学(威海)校科研基金(HIT(WH)201208)

摘　　要：采用TiZrNiCu钎料实现了Ti53311S高温钛合金的钎焊连接,通过SEM、EDS、微区XRD等方法分析了接头界面的微观组织结构,重点研究了钎焊温度对接头界面结构及力学性能的影响规律。结果表明,钎焊接头的典型界面结构为:Ti53311S/α+β/(Ti,Zr)2(Cu,Ni)化合物/α+β/Ti53311S;随钎焊温度的升高,(Ti,Zr)2(Cu,Ni)化合物数量不断减少,当钎焊温度超过α+β→β转变温度时,钎缝及钛合金母材均形成片层状α+β组织;接头抗拉强度随钎焊温度升高逐渐增加后趋于稳定,当在1010℃/10 min条件下钎焊时,接头平均抗拉强度最大为912.8 MPa,断口分析表明,断裂发生于钎缝处,为脆性解理断裂。Ti53311S high-temperature titanium alloy was brazed using TiZrNiCu filler metal. The interfacial microstructure was characterized by SEM, EDS and Micro-focus XRD. Effects of the brazing temperature on the interfacial microstructure and mechanical properties of the joints were investigated. The results show that the typical interracial microstructure is Ti53311S/α＋β/（Ti, Zr）2（Cu, Ni） compounds/α＋β/Ti53311S. The content of brittle （Ti,Zr）2（Cu,Ni） compounds decreases with the temperature increasing and the lamellar α＋βmicrostructure is formed when the brazing temperature exceeds the transformation temperature of α＋β→β. Tensile strength of joints increases gradually at first and then tends to be stable with the increase of brazing temperature. The highest tensile strength of 912.8 MPa is obtained when the specimens are brazed at 1010 ℃ for 10 min. Fracture analysis indicates that the joints fracture at brazing seam showing lots of cleavage planes on the fracture surfaces

关 键 词：Ti53311S合金 TiZrNiCu钎料 界面结构 力学性能 钎焊 

分 类 号：TG425[金属学及工艺—焊接]