Abstract

The effect produced by the time of milling the aluminum Al–12Si alloy powder in a ball mill in an air atmosphere on the macrostructural characteristics of aluminum foam was studied. The milling time was from 5 to 20 min at a speed of 300 rpm and a ball to powder mass ratio of 8 : 1. The treated matrix alloy powder was mixed with 1 wt % of TiH₂, thereupon compact cylindrical specimens were manufactured by hot pressing at a temperature of 400°C. The foaming of specimens was performed in steel die at a temperature of 800°C. The results demonstrated that an increase in the time of milling the powder of aluminum matrix alloy to 15 min had a positive effect on the process of foaming due to a growth in the oxidation level as exhibited by a decrease in the size of formed pores and the density of aluminum foam specimens. However, a further increase in the milling time, at which powder particles coarsened as a result of cold welding, led to the degradation of the macrostructural characteristics of a foam specimen.

中文翻译：

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基体粉末氧化铣削对Al-12Si合金基泡沫铝结构和性能的影响

摘要

研究了在空气气氛中球磨机中球磨铝Al-12Si合金粉末的时间对泡沫铝宏观结构特性的影响。研磨时间为 5 至 20 分钟，转速为 300 rpm，球粉质量比为 8:1。处理后的基体合金粉末与 1 wt% TiH _2混合，然后在 400°C 的温度下通过热压制造紧凑的圆柱形样品。试样的发泡在钢模中在 800°C 的温度下进行。结果表明，将铝基合金粉末的研磨时间增加到 15 分钟对发泡过程有积极的影响，这是由于氧化水平的增加，表现为形成的孔隙尺寸减小和泡沫铝试样的密度。然而，进一步增加研磨时间，此时粉末颗粒由于冷焊而粗化，导致泡沫样品的宏观结构特性退化。