1420铝锂合金双光点激光焊接头组织性能  

Microstructure and Properties of Twin Spot Laser Welded Joints of 1420 Al-Li Alloy

作　　者：杨璟[1,2] 李晓延[1] 陈俐[2] 巩水利[2] 李巧艳[2] 

机构地区：[1]北京工业大学,北京100124 [2]北京航空制造工程研究所高能束流加工技术国家级重点实验室,北京100024

出　　处：《稀有金属材料与工程》2011年第5期871-874,共4页Rare Metal Materials and Engineering

基　　金：国家"十一五"预研资助项目(2006145)

摘　　要：在2mm厚1420铝锂合金双光点激光焊接试验的基础上,研究接头的组织与性能。对比分析单、双光点激光焊接头各区域的组织、显微硬度及室温拉伸力学性能,并观察断口形貌。结果表明:1420铝锂合金双光点激光焊接头组织与单光点激光焊接头组织分布类似,从熔合区至焊缝中心依次是等轴细晶、柱状晶和等轴树枝晶,但较单光点接头细化;双光点激光焊接头各区域硬度低于母材,但高于单光点激光焊接头;双光点激光焊接头焊态抗拉强度较母材下降,但略高于单激光焊接头,可达母材的86%。The microstructure and properties of the joint were studied,based on the trial of twin spot laser welding of 2 mm thick 1420 aluminium-lithium alloy.The characteristics of microstructure,micro-hardness,room-temperature tensile strength and fractography of both twin spot and single spot laser welded joints were compared.The results indicate that the microstructures of the joints by twin spot and single spot laser welding are similar.Equiaxed grains,columnar crystals,and equiaxed dendrite crystals can be found from fusion zone to the weld center in the twin spot welded joint,which are finer than that of single spot welded joint.The microhardness of twin spot laser welded joint is higher than that of single spot laser welded joint,but lower than that of base metal.Meanwhile,the tensile properties of twin spot laser welded joint is decreased to 86% of that of base metal,but a little higher than that of single spot laser welded joint.

关 键 词：铝锂合金 双光点 激光焊接 组织 力学性能 

分 类 号：TG456.7[金属学及工艺—焊接]