Effects of processing variables and heat treatments on Al/Ti-6Al-4V interface microstructure of bimetal clad-plate fabricated via a novel route employing friction stir lap welding
Effects of processing variables and heat treatments on Al/Ti-6Al-4V interface microstructure of bimetal clad-plate fabricated via a novel route employing friction stir lap welding
复制标题
工艺变量和热处理对采用搅拌摩擦搭接焊新工艺制造的双金属复合板 Al/Ti-6Al-4V 界面微观结构的影响
DOI：
10.1016/j.jallcom.2015.10.288
复制
发表时间：
2016-02-15
影响因子：
6.2
通讯作者：
Hu, Weiye
中科院分区：
文献类型：
--
作者：
Li, Bo;Shen, Yifu;Hu, Weiye
采用多道搅拌摩擦搭接焊（FSLW）工艺制备了Al/Ti-6Al-4V复合板。研究了工艺可行性、工艺参数和后退火处理对复合板宏观成形性能、Ti/Al界面层组织和结合强度的影响。在优化的FSLW工艺条件下，在复合板界面处获得了致密性好、厚度可观的Ti/Al冶金结合中间层。在研究了FSLW工艺参数对Ti/Al中间层结构的影响后，进一步探讨了热-机械效应是Ti/Al中间层结构形成的主要机制。结果表明，在400 ℃ ~ 600 ℃退火1h后，Al/Ti-6Al-4V界面处形成了多岛状Al-Al 3 Ti双相结构的扩散溶解层。在Al/Ti-6Al-4V复合板中形成了成分均匀、界面良好的扩散溶解中间层，提高了Al/Ti-6Al-4V复合板的结合强度。FSLW产生的Ti/Al中间层的层状组织在后退火过程中起到了缩短Ti/Al扩散距离的预均匀化作用。(C)2015 Elsevier B. V.版权所有。
Al/Ti-6Al-4V bimetal clad-plates were fabricated via a novel process route employing multi-pass friction stir lap welding (FSLW) method. The process feasibility, effects of processing parameters and post heat anneal treatments on macro formability, Ti/Al interface layer microstructures and bonding strengths of the produced clad-plates were investigated. A Ti/Al metallurgical bonding interlayer at the clad-plate interface location, with good densification and considerable thickness, was obtained under the optimized FSLW process condition. Following the research on the influences of FSLW processing variables on the produced Ti/Al interlayer structure, the thermal-mechanical effect, as the main formation mechanism, was further discussed. It was revealed that the post anneal at 400 degrees C-600 degrees C for 1 h duration generated a diffusion-dissolution layer of multi-island-shaped Al-Al3Ti dual phase structure at the Al/Ti-6Al-4V interface. A well composition-homogenized diffusion-dissolution interlayer with good interfaces between multi-island-like Al and its adjacent Al3Ti phase regions improved the Al/Ti-6Al-4V clad-plate bonding strength. The laminated microstructure of Ti/Al interlayer produced by FSLW exerted a prehomogenization effect on shortening Ti/Al diffusion distance during the post anneal. (C) 2015 Elsevier B.V. All rights reserved.