Abstract

The microstructural changes on the surface of the samples of a binary brass and of brasses alloyed with iron and manganese or aluminum, taken place in the process of superplastic deformation at 550°C at a constant strain rate of 1 × 10^–3 s^–1 have been analyzed in this work. The contributions of the intergranular and intragranular deformation to the total elongation have been determined. It has been shown that the additional alloying of brass leads to a decrease in the contribution of the grain boundary sliding, which is decreased from 54% in the binary brass to 17–23% in the alloyed brasses, and to an increase in the contribution of the intragranular deformation from 10 to 30%. Experiments based on the Kirkendall method have shown that alloying leads to a slowdown of the diffusion processes, which can presumably limit the grain boundary sliding in the investigated multicomponent brasses.

中文翻译：

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二元和多成分黄铜超塑性变形机理的贡献比较

摘要

二元黄铜以及与铁，锰或铝合金化的黄铜样品表面的微观结构变化是在550°C的超塑性变形过程中以1×10 ^–3 s ^–1的恒定应变速率发生的。已经在这项工作中进行了分析。已经确定了晶间和晶内变形对总伸长率的贡献。研究表明，黄铜的额外合金化导致晶界滑动的贡献减小，从二元黄铜的54％下降到合金黄铜的17-23％，并增加了贡献的10％到30％。基于Kirkendall方法的实验表明，合金化会导致扩散过程变慢，这可能会限制所研究的多组分黄铜中的晶界滑动。