Deformation heterogeneity on the cross-sectional planes of a magnesium alloy processed by high-pressure torsion

Figueiredo, Roberto B., Aguilar, Maria Teresa P., Cetlin, Paulo R. and Langdon, Terence G. (2011) Deformation heterogeneity on the cross-sectional planes of a magnesium alloy processed by high-pressure torsion. Metallurgical and Materials Transactions A, 42 (10), 3013-3021. (doi:10.1007/s11661-011-0609-z).

Record type: Article

Abstract

Disks of an extruded AZ31 magnesium alloy were processed by high-pressure torsion (HPT) at a pressure of 6.0 GPa through 1/4, 1, and 5 turns either at room temperature (296 K (23 °C)) or at an elevated temperature of 463 K (190 °C). The cross-sectional planes of the disks were examined after processing, and it is shown that there is a high level of heterogeneity throughout all of the samples. This heterogeneity is revealed through the nature of the flow patterns, through the distributions of grain sizes, and by comprehensive microhardness measurements. The results demonstrate that it is possible to double the strength of the alloy in some areas of the disk after processing through 5 turns at room temperature

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