Processing of a magnesium alloy by equal-channel angular pressing using a back-pressure |
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| Authors: | Cheng Xu Kenong Xia Terence G. Langdon |
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| Affiliation: | aDepartments of Aerospace & Mechanical Engineering and Materials Science, University of Southern California, Los Angeles, CA 90089-1453, USA;bDepartment of Mechanical Engineering and ARC Centre of Excellence for Design in Light Metals, University of Melbourne, Victoria 3010, Australia;cMaterials Research Group, School of Engineering Sciences, University of Southampton, Southampton SO17 1BJ, UK |
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| 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  0.9 μm 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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| Keywords: | Back-pressure Equal-channel angular pressing Hardness Homogeneity Magnesium |
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