激光与光电子学进展, 2018, 55 (5): 051403, 网络出版: 2018-09-11   

AZ31镁合金和铝基复合材料的脉冲激光焊接 下载: 1096次

Pulsed Laser Welding of AZ31 Magnesium Alloy and
作者单位
常熟理工学院汽车工程学院, 江苏 常熟 215500
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36.15 J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。
Abstract
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 Mg17Al12, 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 microstructure is the next, and that of the AZ31 Mg alloy is the weakest.

戴军, 杨莉, 张尧成, 陈春霖. AZ31镁合金和铝基复合材料的脉冲激光焊接[J]. 激光与光电子学进展, 2018, 55(5): 051403. Matrix Composites Aluminum, 杨莉, 张尧成, 陈春霖. Pulsed Laser Welding of AZ31 Magnesium Alloy and[J]. Laser & Optoelectronics Progress, 2018, 55(5): 051403.

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