The significance of strain reversals during processing by high-pressure torsion
The significance of strain reversals during processing by high-pressure torsion
In processing by high-pressure torsion (HPT), it is possible to continuously strain in a forward direction in monotonic HPT (m-HPT) or to reverse the direction of straining in cyclic HPT (c-HPT). Experiments were conducted to compare the effects of torsionally straining high-purity Al using m-HPT and c-HPT through up to 4 turns at room temperature under a pressure of 6.0 GPa. The appearance of the microstructural damage was examined on the surface of each disk and values of the Vickers microhardness were recorded both along disk diameters and over the total surfaces to permit the construction of color-coded contour maps. Although the inhomogeneities in the microstructures decreased with increasing numbers of turns in m-HPT, the experiments show that microstructural evolution is slower when using c-HPT. It is concluded that reversals in the direction of straining during HPT processing provide an opportunity for manipulating the hardness values attained in HPT.
341-348
Kawasaki, Megumi
944ba471-eb78-46db-bfb7-3f0296d9ef6d
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
20 December 2008
Kawasaki, Megumi
944ba471-eb78-46db-bfb7-3f0296d9ef6d
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Kawasaki, Megumi and Langdon, Terence G.
(2008)
The significance of strain reversals during processing by high-pressure torsion.
Materials Science and Engineering: A, 498 (1-2), .
(doi:10.1016/j.msea.2008.08.021).
Abstract
In processing by high-pressure torsion (HPT), it is possible to continuously strain in a forward direction in monotonic HPT (m-HPT) or to reverse the direction of straining in cyclic HPT (c-HPT). Experiments were conducted to compare the effects of torsionally straining high-purity Al using m-HPT and c-HPT through up to 4 turns at room temperature under a pressure of 6.0 GPa. The appearance of the microstructural damage was examined on the surface of each disk and values of the Vickers microhardness were recorded both along disk diameters and over the total surfaces to permit the construction of color-coded contour maps. Although the inhomogeneities in the microstructures decreased with increasing numbers of turns in m-HPT, the experiments show that microstructural evolution is slower when using c-HPT. It is concluded that reversals in the direction of straining during HPT processing provide an opportunity for manipulating the hardness values attained in HPT.
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Published date: 20 December 2008
Organisations:
Engineering Mats & Surface Engineerg Gp
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Local EPrints ID: 64356
URI: http://eprints.soton.ac.uk/id/eprint/64356
ISSN: 0921-5093
PURE UUID: 20d4ddb5-1a85-4b8c-ae73-69845ebefcf5
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Date deposited: 19 Dec 2008
Last modified: 16 Mar 2024 03:28
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Author:
Megumi Kawasaki
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