作　　者： ; ; ; ;

机构地区： 山东大学材料科学与工程学院材料液态结构及其遗传性教育部重点实验室

出　　处： 《焊接学报》 2014年第4期63-66,116,共5页

摘　　要： 对RuTi钛合金与1060Al进行脉冲熔化极氩弧熔-钎焊(P-GMAW),采用扫描电镜(SEM)、显微硬度仪等对RuTi/1060Al接头显微组织进行分析;对焊缝中的析出相及钛合金侧过渡区进行能谱(EDS)元素分布分析.结果表明,RuTi/1060Al接头焊缝由α-Al树枝晶及分布于树枝晶边界的α-Al+Si共晶组织组成.焊缝中出现了由Ti(Al,Si)3金属间化合物组成的条状、块状析出相.RuTi钛合金与焊缝之间形成了一层厚度小于10μm、主要由Ti(Al,Si)3金属间化合物组成的锯齿状过渡区.随着焊接热输入的增加,Ti/Al过渡区由锯齿状向条状变化.钛合金热影响区主要由针状α″马氏体与条状α’马氏体组成,显微硬度为2.16~2.65 GPa. Pulsed gas metal arc welding of RuTi titanium alloy to 1060 aluminum was conducted. The microstructure in weld zone of RuTi Ti /1060Al joint was examined by scanning electron microscope( SEM) fitted with energy-dispersive spectrometer( EDS). Elemental distribution and precipitated phase in weld zone and transition region on Ti alloy side were analyzed by EDS. The weld zone was composed of α-Al dendrites and eutectic α-Al + Si structures. The eutectic α-Al + Si structures distributed along the boundaries of α-Al dendrites. Striped or block Ti( Al,Si)3intermetallics appeared in the weld zone. A serrated transition region mainly containing Ti( Al,Si)3intermetallics was formed between the RuTi titanium alloy and the weld zone. The width of the Ti / Al transition region was less than 10 μm. With the increasing of welding heat input,the Ti / Al transition region presented a rod-like appearance. The heat-affected zone( HAZ) of RuTi titanium alloy consisted of acicular α″ and lath α' martensite. The average microhardness in the HAZ was about 2. 16-2. 65 GPa.

关 键 词： 钛合金 铝 脉冲熔化极氩弧焊 显微组织 析出相

领　　域： [金属学及工艺]