Properties of a ZK60 magnesium alloy processed by high-pressure torsion
Properties of a ZK60 magnesium alloy processed by high-pressure torsion
An extruded ZK60 magnesium alloy with an initial grain size of ?9.4 ?m was processed by high pressure torsion (HPT) for up to 5 revolutions and microstructural observations were carried out using optical and scanning electron microscopy. Measurements of the Vickers microhardness over the disk surfaces revealed lower values in the central areas of the disks after low numbers of HPT turns but with a reasonable level of homogeneity across the disks after processing by HPT through 5 turns at 2.0 GPa. The average grain size after 5 revolutions was ?1.0 ?m. Samples were processed by HPT through 5 turns and then tested in tension at a temperature of 473 K. The results show the occurrence of superplastic behavior with a maximum elongation to failure of about 535% when testing with an initial strain rate of 1.0 × 10?4 s?1. These results are consistent with earlier data obtained on the ZK60 alloy after processing by equal-channel angular pressing (ECAP) but the elongations to failure are lower because of using miniature tensile specimens cut from the HPT disks
hardness, high-pressure torsion, magnesium alloy, severe plastic deformation, superplasticity
357-363
Torbati-Sarraf, Seyed Alireza
0d44235a-4532-4147-b270-487fb303d386
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
November 2014
Torbati-Sarraf, Seyed Alireza
0d44235a-4532-4147-b270-487fb303d386
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Torbati-Sarraf, Seyed Alireza and Langdon, Terence G.
(2014)
Properties of a ZK60 magnesium alloy processed by high-pressure torsion.
Journal of Alloys and Compounds, 613, .
(doi:10.1016/j.jallcom.2014.06.056).
Abstract
An extruded ZK60 magnesium alloy with an initial grain size of ?9.4 ?m was processed by high pressure torsion (HPT) for up to 5 revolutions and microstructural observations were carried out using optical and scanning electron microscopy. Measurements of the Vickers microhardness over the disk surfaces revealed lower values in the central areas of the disks after low numbers of HPT turns but with a reasonable level of homogeneity across the disks after processing by HPT through 5 turns at 2.0 GPa. The average grain size after 5 revolutions was ?1.0 ?m. Samples were processed by HPT through 5 turns and then tested in tension at a temperature of 473 K. The results show the occurrence of superplastic behavior with a maximum elongation to failure of about 535% when testing with an initial strain rate of 1.0 × 10?4 s?1. These results are consistent with earlier data obtained on the ZK60 alloy after processing by equal-channel angular pressing (ECAP) but the elongations to failure are lower because of using miniature tensile specimens cut from the HPT disks
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Published date: November 2014
Keywords:
hardness, high-pressure torsion, magnesium alloy, severe plastic deformation, superplasticity
Organisations:
Engineering Mats & Surface Engineerg Gp
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Local EPrints ID: 368109
URI: http://eprints.soton.ac.uk/id/eprint/368109
ISSN: 0925-8388
PURE UUID: f423eb76-84aa-4bb8-8516-4b6bca35a777
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Date deposited: 12 Sep 2014 14:14
Last modified: 15 Mar 2024 03:13
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Author:
Seyed Alireza Torbati-Sarraf
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