Hangai Yoshihiko, Utsunomiya Takao, Kuwazuru Osamu, Kitahara Soichiro, Yoshikawa Nobuhiro
Graduate School of Science and Technology, Gunma University, Kiryuu 376-8515, Japan.
Faculty of Engineering, Shibaura Institute of Technology, Tokyo 135-8548, Japan.
Materials (Basel). 2015 Oct 21;8(10):7161-7168. doi: 10.3390/ma8105366.
Recently, to further improve the performance of aluminum foam, functionally graded (FG) aluminum foams, whose pore structure varies with their position, have been developed. In this study, three types of FG aluminum foam of aluminum alloy die casting ADC12 with combinations of two different amounts of added blowing agent titanium(II) hydride (TiH₂) powder were fabricated by a friction stir welding (FSW) route precursor foaming method. The combinations of 1.0-0 mass %, 0.4-0 mass %, and 0.2-0 mass % TiH₂ were selected as the amounts of TiH₂ relative to the mass of the volume stirred by FSW. The static compression tests of the fabricated FG aluminum foams were carried out. The deformation and fracture of FG aluminum foams fundamentally started in the high-porosity (with TiH₂ addition) layer and shifted to the low-porosity (without TiH₂ addition) layer. The first and second plateau regions in the relationship between compressive stress and strain independently appeared with the occurrence of deformations and fractures in the high- and low-porosity layers. It was shown that FG aluminum foams, whose plateau region varies in steps by the combination of amounts of added TiH₂ (, the combination of pore structures), can be fabricated.
最近，为了进一步提高泡沫铝的性能，已经开发出了功能梯度（FG）泡沫铝，其孔隙结构随位置而变化。在本研究中，通过搅拌摩擦焊（FSW）路线前驱体发泡法制备了三种铝合金压铸件ADC12的FG泡沫铝，它们是由两种不同添加量的发泡剂氢化钛（TiH₂）粉末组合而成。相对于FSW搅拌体积的质量，选择1.0 - 0质量%、0.4 - 0质量%和0.2 - 0质量%的TiH₂组合作为TiH₂的添加量。对制备的FG泡沫铝进行了静态压缩试验。FG泡沫铝的变形和断裂基本上从高孔隙率（添加TiH₂）层开始，然后转移到低孔隙率（未添加TiH₂）层。在高孔隙率层和低孔隙率层中分别出现变形和断裂时，压缩应力与应变关系中的第一和第二平台区独立出现。结果表明，可以制备出平台区因添加TiH₂量（孔隙结构组合）的不同而呈阶梯状变化的FG泡沫铝。
