Abstract

The alloy composition is an important factor effecting the pore structure of aluminum foam. In this paper, the powder compact foaming method was used, and different content of Cu element powders were added to the alloy Al–9Si, for investigating the effect of alloying element on foaming process. With the Cu content of Al–Si–Cu alloy increasing, the expansion ratio is increased, the time required to reach maximum expansion is shortened, and the number of fissure-like pores at early foaming stage is decreased. This improving action is related to the higher volume fraction of liquid phase in same melting temperature caused by increasing Cu content in alloy. Comparing different Al–Si–Cu alloys with different Cu content at same expansion ratio, the higher Cu content, the smaller pore size and the thinner cell wall. This beneficial effect on pore structure is attributed to the addition of Cu that is benefit to increasing the viscosity of Al–Si–Cu alloy during foaming. And at same expansion rate, the more content of Cu in Al–Si–Cu alloy, the higher compressive strength of aluminum foam.

Graphic Abstract

中文翻译：

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铜对铝硅泡沫细孔结构的影响

摘要

合金组成是影响泡沫铝的孔结构的重要因素。本文采用粉末致密发泡方法，并向合金Al-9Si中添加不同含量的Cu元素粉末，以研究合金元素对发泡过程的影响。随着Al–Si–Cu合金中Cu含量的增加，膨胀率增加，达到最大膨胀所需的时间缩短，发泡初期的裂隙状孔的数量减少。该改善作用与合金中Cu含量的增加引起的在相同熔融温度下液相的体积分数更高有关。比较相同膨胀率下具有不同Cu含量的不同Al-Si-Cu合金，Cu含量越高，孔径越小，孔壁越薄。这种对孔结构的有益影响归因于铜的添加，而铜的添加有利于增加发泡过程中Al–Si–Cu合金的粘度。在相同的膨胀率下，Al-Si-Cu合金中的Cu含量越高，泡沫铝的抗压强度就越高。

图形摘要