钎焊方法制备泡沫铝/铝夹芯板的组织及性能
Microstructure and properties of aluminum foam/aluminum sandwich prepared by brazing
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摘要: 采用Al-Si钎料真空钎焊的方法制备了泡沫铝/铝夹芯板，对夹芯板钎焊界面处微观组织进行了金相、SEM形貌、EDS能谱分析，并对夹芯板弯曲力学性能进行了研究，分析了钎焊工艺参数对泡沫铝/铝焊缝微观组织及力学性能的影响.结果表明，在605~625℃温度下保温20 min，夹芯板钎缝中心区微观组织主要由α（Al）固溶体、块状CaAl2Si2化合物、骨骼状CaAl4组成；随着焊接温度的升高，钎料中合金元素向母材中扩散速度加快，块状CaAl2Si2分布更加均匀、分散，提高了焊缝中心区的韧性；当焊接温度为625℃时，泡沫铝/铝夹芯板抗弯强度达到最高的67.97 MPa.Abstract: The foam aluminum/aluminum sandwich was prepared by vacuum brazing with Al-Si as brazing filler. The microstructure of the sandwich panel was characterized by metallography, SEM morphology and EDS spectrum. Meanwhile the bending mechanical properties of the sandwich panels and the effects of the parameters of brazing on the microstructure and mechanical properties of the aluminum/aluminum alloy foam joints were analyzed. The results shown that the microstructure in the central zone of brazing seam was mainly composed of α (Al) solid solution, massive CaAl2Si2compound and skeletal CaAl4 at the welding temperature 605~625℃ for 20 min. With the increase of the welding temperature, diffusion of the alloying elements was accelerated into the base metal, and the distribution of massiveCaAl2Si2 become more uniform. The toughness of the weld center was improved. When the welding temperature was 625℃, The highest strength up to 67.97MPa of the foam aluminum/aluminum sandwich were achieved.
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