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不同坡口形状的双光斑激光熔钎焊Ti/Al对接接头的微观组织与力学性能

The Microstructure and Mechanical Properties of Dual-Spot Laser Welded-Brazed Ti/Al Butt Joints with Different Groove Shapes.

作者信息

Li Peng, Lei Zhenglong, Zhang Xinrui, Cai Enze, Chen Yanbin

机构信息

State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, 92 West Dazhi Street, Harbin 150001, China.

出版信息

Materials (Basel). 2020 Nov 12;13(22):5105. doi: 10.3390/ma13225105.

DOI:10.3390/ma13225105
PMID:33198261
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7698248/
Abstract

Laser welding-brazing was performed to join Ti and Al together. The dual-spot laser beam mode was selected as the heat source in this study. Ti-6Al-4V and 6061-T6 Al alloys were selected as the experimental materials. Al-12Si welding wire was selected as the filler material. The effect of groove shape on the weld appearance, microstructure, temperature field, and mechanical performance of Ti/Al welded-brazed butt joints was investigated. The interfacial intermetallic compound (IMC) layer at the Ti/Weld brazing interface was inhomogeneous in joints with I-shaped and Y-shaped grooves. In Ti/Al joints with V-shaped grooves, the homogeneity of temperature field and IMC layer was improved, and the maximum thickness difference of IMC layer was only 0.20 μm. Nano-sized granular TiAlSi, TiSi, and Ti(Al,Si) constituted the IMCs. The tensile strength of Ti/Al joints with V-shaped grooves was the highest at 187 MPa. The fracture mode transformed from brittle fractures located in the IMC layer to ductile fractures located in the Al base metal, which could be attributed to the improvement of the IMC layer at the brazing interface.

摘要

采用激光熔钎焊将钛和铝连接在一起。本研究选择双光斑激光束模式作为热源。选用Ti-6Al-4V和6061-T6铝合金作为实验材料。选用Al-12Si焊丝作为填充材料。研究了坡口形状对Ti/Al熔钎焊对接接头焊缝外观、微观组织、温度场和力学性能的影响。在采用I形和Y形坡口的接头中，Ti/焊缝钎焊界面处的界面金属间化合物（IMC）层不均匀。在采用V形坡口的Ti/Al接头中，温度场和IMC层的均匀性得到改善，IMC层的最大厚度差仅为0.20μm。纳米级颗粒TiAlSi、TiSi和Ti(Al,Si)构成了IMC。采用V形坡口的Ti/Al接头的抗拉强度最高，为187MPa。断裂模式从位于IMC层的脆性断裂转变为位于铝母材中的韧性断裂，这可归因于钎焊界面处IMC层的改善。

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本文引用的文献

1
Microstructure and Tensile Behavior of Laser Arc Hybrid Welded Dissimilar Al and Ti Alloys.激光电弧复合焊接异种铝钛合金的微观结构与拉伸行为
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