泡沫铝及其三明治结构累积叠轧制备

通过累积叠轧法制备泡沫铝.采用称重法研究泡沫铝孔隙结构,利用光学显微镜观察泡沫铝孔隙形貌.发现以TiH₂为发泡介质,当发泡温度660~680℃和发泡时间6~10 min时,利用累积叠轧法制备泡沫铝的孔隙结构特性最好.发泡温度和发泡时间的最佳值与发泡剂用量有关,TiH₂质量分数为1.5%,在670℃发泡8 min,泡沫铝的孔隙率可达到42%,孔径为0.43 mm.以制备的泡沫铝为夹芯,通过轧制复合制备了TC4钛合金/泡沫铝芯和1Cr18Ni9Ti不锈钢/泡沫铝芯三明治板.利用光学显微镜和能谱仪研究了三明治板的界面.面板与芯板间的化合反应形成了界面的反应层,界面实现了冶金结合. 

Preparation of aluminum foams and their sandwiches by accumulative roll-bonding

Aluminum foams were prepared by accumulative roll-bonding (ARB). Their porosity and pore mor- phology were studied by weighing and optical microscopy, respectively. It is found that aluminum foams prepared by ARB with TiH₂ powder as the blister have optimum performance within the foaming temperature of 660 to 680 ℃ and the foaming time of 6 to 10 min. The optimum values of foaming temperature and foaming time are relevant to blister content. With 1.5% TiH₂ at 670 ℃ for 8 min, the porosity and pore size of aluminum foams can reach 42% and 0.43 mm, respectively. Taking the aluminum foam by accumulative roll-bonding as the core, TC4 titanium alloy/aluminum foam and 1Crl8Ni9Ti stainless steel/aluminum foam sandwiches were produced by roll cladding. The interface morphology of these sandwiches was investigated by optical microscopy and energy spectrum analysis. A conversion zone forms by combination reaction between the face plate and the core plate, leading to metallurgical bonding at the interface.