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采用超声辅助液态扩散焊接的方法制备冶金复合泡沫铝夹芯板,利用光学显微镜(OM)和SEM观察冶金复合样品的界面组织和结构,发现连接界面发生了侵蚀作用,接头均匀连续;EDS线扫结果表明,连接界面处焊接合金(Zn-10Al)和铝基体间的元素扩散现象明显。表明在超声作用下,基体材料表面氧化膜被破坏,枝晶在界面附着生长,形成良好的冶金连接。将制备的冶金复合样品和胶黏泡沫铝夹芯板样品进行三点弯曲疲劳对比试验,结果显示冶金复合样品和胶黏样品的疲劳极限分别达到3058N和2829N。在相同载荷下,冶金复合样品的疲劳寿命远远长于胶黏样品。两种样品的疲劳破坏方式完全不同,胶黏样品表现为面板和芯层粘接面的脱粘剪切破坏,冶金复合样品的疲劳剪切破坏出现在泡沫铝芯层,没有出现面板脱离现象。
The metallurgical composite foam aluminum sandwich panel was prepared by ultrasonic assisted liquid diffusion welding. The microstructure and microstructure of the metallurgical composite samples were observed by optical microscope (OM) and SEM, and the erosion of the interface was observed. The joints were uniform and continuous. The EDS line scan The results show that the elemental diffusion between the welded alloy (Zn-10Al) and the aluminum matrix at the interface is obvious. It shows that under the action of ultrasound, the oxide film on the surface of the matrix material is destroyed and the dendrite grows on the interface to form a good metallurgical connection. The three-point bending fatigue test of the prepared metallurgical composite sample and the adhesive aluminum foam sandwich panel shows that the fatigue limit of the metallurgical composite sample and the adhesive sample reaches 3058N and 2829N, respectively. Under the same load, the fatigue life of the metallurgical composite sample is much longer than the adhesive sample. The fatigue failure modes of the two samples are totally different. The adhesive samples show the debonding and shearing failure of the bonding surface of the panel and the core layer, and the fatigue shear failure of the metallurgical composite samples appears in the aluminum foam foam layer with no panel detachment.