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Superplasticity of Spray Deposited 5083 Al-Mg Alloy

机译：喷镀5083 Al-Mg合金的超塑性

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摘要

The superplasticity of spray deposited and thermomechanical processed 5083 Al-Mg alloy is investigated in this paper. The results show that spray deposited 5083 Al exhibits an equiaxed grain morphology with an average size of 15 m and porosity in the range of 0.1 vol. % to 5 vol. % . Two distinct TMP procedures are employed to close porosity and refine grain size: extrusion plus rolling and direct rolling. The material processed using the former method exhibits a relatively high superplasticity with a maximum superplastic elongation of 465 % , whereas that processed using the latter method exhibits a maximum superplastic elongation of 295 % . Materials processed using extrusion plus rolling and direct rolling both exhibit similar stress-strain behavior and strain rate sensitivity factors. The strain rate factors are in the 0.3 to 0.5 range. The difference in their superplastic elongation is possibly the result of differences in grain size and available cavity nucleation sites provided by closed gas pores.
机译：研究了喷射沉积和热机械加工的5083 Al-Mg合金的超塑性。结果表明，喷镀沉积的5083 Al表现出等轴晶形态，平均尺寸为15 m，孔隙率范围为0.1 vol。 ％至5卷％。采用两种截然不同的TMP程序来封闭孔隙并细化晶粒尺寸：挤压加轧制和直接轧制。使用前一种方法加工的材料表现出较高的超塑性，最大超塑性伸长率为465％，而使用后一种方法加工的材料显示最大超塑性伸长率为295％。使用挤压，轧制和直接轧制加工的材料均显示出相似的应力-应变行为和应变速率敏感性因子。应变率因子在0.3到0.5范围内。它们超塑性伸长率的差异可能是由于晶粒尺寸和封闭气孔提供的可用腔体成核位点不同的结果。

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