Abstract The shaping of aluminum foam with high productivity is indispensable for the wide use of lightweight aluminum foam in various industrial fields. The precursor foaming process is one of the industrialized manufacturing processes of aluminum foam. Recently, a process for the press forming of aluminum foam during foaming of the precursor has been developed. In this study, pores during press forming were observed nondestructively by X-ray radiography. The behaviors of pores during press forming while foaming the precursor and during press forming at room temperature after the precursor had been foamed and solidified were compared. It was shown that the pores during press forming during foaming can be continuously observed nondestructively by X-ray radiography. Pores in the aluminum foam only moved and did not collapse during press forming while foaming, which indicated that ductile material flow occurred during press forming. In contrast, no flow of pores in the aluminum foam was observed during press forming of the aluminum foam at room temperature, but the cell walls collapsed and the density of the aluminum foam increased, which indicated that brittle fracture occurred during press forming. From X-ray computed tomography (CT) images of the samples, the pore structures of aluminum foam press-formed during foaming were similar to those of the aluminum foam before press forming. In contrast, the pore structures of the aluminum foam press-formed at room temperature were considerably different from those of the aluminum foam before press forming. Consequently, it was demonstrated that the press forming of aluminum foam during foaming can be used to shape aluminum foam without affecting the pore structures.

中文翻译：

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X射线照相无损观察泡沫铝压制成形过程中的气孔

摘要 泡沫铝的高生产率成型对于轻质泡沫铝在各个工业领域的广泛应用是必不可少的。前驱体发泡工艺是泡沫铝工业化制造工艺之一。最近，已经开发了一种在前体发泡过程中对泡沫铝进行压制成型的方法。在这项研究中，通过 X 射线照相无损地观察了压制成型过程中的气孔。比较前驱体发泡时的压制成型时和前驱体发泡固化后的室温压制成型时的气孔行为。结果表明，在发泡过程中压制成型过程中的气孔可以通过 X 射线照相无损地连续观察。泡沫铝中的孔在发泡过程中在压制成型过程中仅移动而没有塌陷，这表明在压制成型过程中发生了韧性材料流动。相比之下，在室温下泡沫铝压制成型过程中没有观察到泡沫铝中的孔隙流动，但泡孔壁坍塌，泡沫铝的密度增加，这表明压制成型过程中发生了脆性断裂。从样品的 X 射线计算机断层扫描 (CT) 图像来看，发泡过程中压制成型的泡沫铝的孔隙结构与压制成型前的泡沫铝相似。相比之下，室温下压制成型的泡沫铝的孔结构与压制成型前的泡沫铝的孔结构有很大不同。最后，