电弧超声对SiC_p/AlMMCs焊缝组织与性能的影响  

Effect of arc-ultrasonic on microstructures and mechanical properties of welded joint of SiC_p/Al MMCs

作　　者：雷玉成[1,2] 王志伟[1] 陈希章[1] 闫久春[2] 

机构地区：[1]江苏大学材料学院,江苏镇江212013 [2]哈尔滨工业大学现代焊接生产技术国家重点实验室,哈尔滨150001

出　　处：《焊接学报》2010年第10期17-21,共5页Transactions of The China Welding Institution

基　　金：哈尔滨工业大学现代焊接生产技术国家重点实验室开放基金资助项目(09003);江苏科技大学先进焊接技术省级重点开放研究基金资助项目(JSAWT-09-03)

摘　　要：以Ti合金作为填加材料,以氮氩混合气作为离子气,对SiCp/6061Al基复合材料进行电弧超声等离子弧原位合金化焊接,研究了电弧超声对等离子弧焊接头组织和性能的影响.结果表明,在不加超声时,焊缝中新生AlN相呈细长条状,Al3Ti相粗大,TiC,TiN等新生增强颗粒分布不均匀;在加入超声后,焊缝组织细密,TiC,TiN,AlN等增强相呈细小颗粒状存在,数量增加,且分布均匀,Al3Ti相尺寸减小,数量减少,从而有效改善了焊接接头的组织和性能,使焊接接头抗拉强度最大值达到225MPa,比不加超声时提高了约7%.The SiCp/6061Al MMCs joints were produced by arc-ultrasonic plasma arc in-situ weld-alloying by argon-nitrogen mixture as plasma gases and Ti wire as filler composite,and the effect of arc-ultrasonic on the microstructures and mechanical properties of the joints was investigated.The results indicate that without arc-ultrasonic (conventional plasma arc welding (PAW)),new phase AlN is slender needle-like,Al3Ti is bulky,and the new particles such as TiC and TiN distribute unevenly in weld.Because arc-ultrasonic can refine the new reinforced composites such as TiC and TiN significantly and improve their distribution,new phase Al3Ti become smaller and less.The test results of mechanical property show that the maximum tensile strength of the welded joint gained with arc-ultrasonic is 225 MPa,raising about 7% compared with conventional PAW.

关 键 词：SICP/AL基复合材料 等离子弧焊接 电弧超声 力学性能 

分 类 号：TG456[金属学及工艺—焊接] TG407