An evaluation of the flow behavior during high strain rate superplasticity in an Al−Mg−Sc alloy
An evaluation of the flow behavior during high strain rate superplasticity in an Al−Mg−Sc alloy
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DOI：
10.1007/s11661-001-1006-9
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发表时间：
2001-12
期刊：
影响因子：
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通讯作者：
S. Komura;Z. Horita;M. Furukawa;M. Nemoto;T. Langdon
中科院分区：
文献类型：
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作者：
S. Komura;Z. Horita;M. Furukawa;M. Nemoto;T. Langdon
通过铸造制备 Al-3%Mg-0.2%Sc 合金，并进行等通道角压制，将晶粒尺寸减小至~0.2μm。该合金在 573 至 723 K 的温度范围内实现了非常高的拉伸伸长率，在 673 和 723 K 的温度下以及应变率等于或高于 10−2s−1 时，伸长率高达 >2000 pct。相比之下，经过冷轧 (CR) 的相同合金样品在 673 K 时的断裂伸长率 < 400%。对等通道角 (ECA) 压制样品的实验数据的分析显示与传统超塑性的一致性，包括超塑性流动的激活能，其在纯 Al 中晶界扩散和 Al-Mg 固溶体合金中相互扩散的预期范围内。
An Al-3 pct Mg-0.2 pct Sc alloy was fabricated by casting and subjected to equal-channel angular pressing to reduce the grain size to ∼0.2µm. Very high tensile elongations were achieved in this alloy at temperatures over the range from 573 to 723 K, with elongations up to >2000 pct at temperatures of 673 and 723 K and strain rates at and above 10−2s−1. By contrast, samples of the same alloy subjected to cold rolling (CR) yielded elongations to failure of <400 pct at 673 K. An analysis of the experimental data for the equal-channel angular (ECA)-pressed samples shows consistency with conventional superplasticity including an activation energy for superplastic flow which is within the range anticipated for grain boundary diffusion in pure Al and interdiffusion in Al-Mg solid solution alloys.