泡沫铝及其三明治结构累积叠轧制备

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

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.

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 Till2 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.