基于Ti中间层的SiC_(p)/6061-T6Al MMCs低功率激光-TIG复合焊接头组织与性能  

Microstructure and Properties of SiC_(p)/6061-T6Al MMCs Joint Manufactured by Low-Power Laser-TIG Hybrid Welding Technology with Ti as Interlayer

作　　者：巴现礼 高增[1] 王振江[1] 邱得超 牛济泰[1,2,3] 邱玉洁 Ba Xianli;Gao Zeng;Wang Zhenjiang;Qiu Dechao;Niu Jitai;Qiu Yujie(School of Materials Science and Engineering,Henan Polytechnic University,Jiaozuo 454000,China;State Key Laboratory of Advanced Welding and Joining,Harbin Institute of Technology,Harbin 150001,China;Henan Jingtai High-Novel Materials Ltd.of Science and Technology,Jiaozuo 454000,China)

机构地区：[1]河南理工大学材料科学与工程学院,河南焦作454000 [2]哈尔滨工业大学先进焊接与连接国家重点实验室,黑龙江哈尔滨150001 [3]河南晶泰航空航天高新材料科技有限公司,河南焦作454000

出　　处：《稀有金属材料与工程》2021年第10期3657-3663,共7页Rare Metal Materials and Engineering

基　　金：河南省重点创新示范专项(191110211800);河南省高校基本科研业务费专项资金(NSFRF180405);河南省科技攻关项目(202102210036)。

摘　　要：以0.1 mm厚的Ti箔作中间夹层,使用低功率激光-TIG复合焊的方式对SiC_(p)/6061-T6Al MMCs进行焊接,并对接头的宏观形貌、显微组织、物相、电阻率、抗拉强度及断口形貌进行分析。结果表明:激光功率对焊缝的成形有着较大影响;Ti箔的加入基本抑制了焊缝中针状Al_(4)C_(3)的生成,并生成TiC增强相以及条状TiAl_(3);焊缝区为等轴晶组织,熔合区为柱状晶组织,热影响区组织变化不明显;随着激光功率的增加,接头的电阻率呈现出增加的趋势,并明显高于母材;在554 W时,接头的抗拉强度可达196.98 MPa,是母材强度的54.71%。接头断口中几乎没有气孔,韧窝中的第二相粒子以TiC为主,接头呈现出以脆性断裂为主的脆-韧性混合断裂特征。Using Ti foil with thickness of 0.1 mm as the interlayer,SiC_(p)/6061-T6Al MMCs was welded by employing low-power laser-TIG hybrid welding.After welding experiment,the macro morphology,microstructure,phase,resistivity,tensile strength and fracture morphology of the joint were analyzed.The results show that laser power has significant influence on the formability of welding seam.Ti foil can basically suppress the formation of needle-like Al_(4)C_(3) in weld seam.Meanwhile,some new phases such as TiC reinforcement phase and strip-like TiAl_(3) generate in welding seam.The microstructures of weld zone and fusion zone are equiaxed crystal and columnar crystal,respectively.The microstructure in heat-affected zone does not change obviously.The joint resistivity increases with the increasing of laser power and the value of joint resistivity is significantly higher than that in base material.The joint tensile strength achieves 196.98 MPa,which is equal to 54.71%of base material,when laser power of 554 W is applied.There are almost no pores in joint fracture and the second phase particle in dimple is mainly composed of TiC.The joint displays the characteristics of brittle-ductile mixed fracture which is dominated by brittle fracture.

关 键 词：SiC_(p)/6061-T6Al复合材料 激光-TIG复合焊 Ti箔中间层 显微组织 性能 

分 类 号：TG442[金属学及工艺—焊接]