Processing of a magnesium alloy by equal-channel angular pressing using a back-pressure

Xu, Cheng, Xia, Kenong and Langdon, Terence G. (2009) Processing of a magnesium alloy by equal-channel angular pressing using a back-pressure. Materials Science and Engineering: A, 527 (1-2), 205-211. (doi:10.1016/j.msea.2009.07.063).

Record type: Article

Abstract

Experiments were conducted on the magnesium AZ31 alloy to evaluate the significance of conducting equal-channel angular pressing (ECAP) with a back-pressure. Following processing by ECAP, the values of the Vickers microhardness were recorded on the cross-sectional planes and microstructural observations were undertaken using transmission electron microscopy. The results show an increase in the hardness in the first pass with significant microstructural inhomogeneity and a transition towards a more homogeneous structure with subsequent passes. The grain size was measured as not, vert, similar0.9 ?m after 8 passes. A comparison with published data on the same alloy processed by ECAP without a back-pressure suggests several advantages in incorporating a back-pressure into ECAP. These advantages include the ability to achieve greater grain refinement, a potential for pressing at lower temperatures and the development of a more rapid evolution towards a homogeneous microstructure.

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