摘要
利用脉冲激光器进行了AZ31镁合金和TiB2增强铝基复合材料的焊接,分析了接头的微观组织,以及耐腐蚀性和硬度等性能,研究了添加TiB2中间层对接头性能的影响。结果表明,当激光单点能量为36.15J时,对焊缝成形的影响由大到小的参数依次为离焦量、脉冲频率、焊接速度。最优工艺参数下获得的接头焊缝区为细小的等轴晶且无明显缺陷,焊缝上部出现了层状富集带,焊缝中部存在Mg17Al12、AlMg、Al3Ti等金属间化合物。TiB2增强铝基复合材料的耐腐蚀性最强、焊缝组织的次之、AZ31镁合金的最弱。
The AZ31 magnesium alloy and TiB2 enhancement aluminum matrix composites are welded by a pulsed laser and the microstructures, the properties of corrosion resistance, hardness and so on for the welded joints are investigated. The effect of the addition of TiB2 interlayers on the performance of the welded joints is studied. The results show that, when the single point energy of the pulsed laser is 36.15 J, the parameters are defocusing, pulse frequency and welding speed sorted from the greatest to the least according to their influence degrees on the weld formation. Under the optimal welding parameters, there are equiaxed grains and no obvious defects in the weld zones of joints. There exist layered abundance zones on the top of the weld beams and Mg17 Al12, AlMg, Al3Ti intermetallic compounds in the middle of the weld beams. As for the corrosion resistance rate, that of TiB2 enhancement aluminum matrix composite is the strongest, that of the weld mierostructure is the next, and that of the AZ31 Mg alloy is the weakest.
作者
戴军
杨莉
张尧成
陈春霖
Dai Jun;Yang Li;Zhang Yaocheng;Chen Chunlin(School of Automotive Engineering, Changshu lnstitute of Technotogy, Changshu, Jiangsu 215500, China)
出处
《激光与光电子学进展》
CSCD
北大核心
2018年第5期261-266,共6页
Laser & Optoelectronics Progress
基金
国家自然科学基金(51505040)
江苏省自然科学基金(BK20141228)
江苏省大型工程装备检测与控制重点建设实验室开放课题(JSKLEDC201507)
关键词
激光技术
激光焊接
AZ31镁合金
铝基复合材料
微观组织
耐腐蚀性能
laser technique
laser welding
AZ31 magnesium alloy
aluminum matrix composites
mierostruetures
corrosion resistance
