Orientation imaging microscopy and microhardness in a ZK60 magnesium alloy processed by high-pressure torsion
Orientation imaging microscopy and microhardness in a ZK60 magnesium alloy processed by high-pressure torsion
An extruded ZK60 magnesium alloy was processed by high-pressure torsion (HPT) at room temperature for up to 5 turns under a constant compressive pressure of 2.0 GPa with a rotation speed of 1 rpm. This processing produced an average grain size of ~700 nm. The grain size distributions and textures were examined by electron backscatter diffraction (EBSD) and this revealed some multi-modality in the microstructure at different stages of straining with
fractions of both coarse grains and ultrafine grains. EBSD analysis at the mid-radius positions of unprocessed and HPT-processed materials revealed a gradual evolution from a prismatic {1010} fiber to an ultimate basal {0001} fiber texture with the c-axis parallel to the normal direction. The majority of grain boundaries had misorientations larger than 15o throughout the processing.
The strain hardening tended towards a reasonable hardness homogeneity with a hardenability exponent, η, of 0.07 up to strains of ~20 and with a subsequent hardness saturation at Hv » 125.
185-193
Torbati-Sarraf, Seyed A.
53a0a227-8f39-4492-bdd5-65515ae95113
Sabbaghianrad, Shima
2dbc35ee-f341-42fd-9081-94ef3e9b10b0
Figueiredo, Roberto B.
1017915f-2dc2-4c4c-a551-721ab6666c7e
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
25 July 2017
Torbati-Sarraf, Seyed A.
53a0a227-8f39-4492-bdd5-65515ae95113
Sabbaghianrad, Shima
2dbc35ee-f341-42fd-9081-94ef3e9b10b0
Figueiredo, Roberto B.
1017915f-2dc2-4c4c-a551-721ab6666c7e
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Torbati-Sarraf, Seyed A., Sabbaghianrad, Shima, Figueiredo, Roberto B. and Langdon, Terence G.
(2017)
Orientation imaging microscopy and microhardness in a ZK60 magnesium alloy processed by high-pressure torsion.
Journal of Alloys and Compounds, 712, .
(doi:10.1016/j.jallcom.2017.04.054).
Abstract
An extruded ZK60 magnesium alloy was processed by high-pressure torsion (HPT) at room temperature for up to 5 turns under a constant compressive pressure of 2.0 GPa with a rotation speed of 1 rpm. This processing produced an average grain size of ~700 nm. The grain size distributions and textures were examined by electron backscatter diffraction (EBSD) and this revealed some multi-modality in the microstructure at different stages of straining with
fractions of both coarse grains and ultrafine grains. EBSD analysis at the mid-radius positions of unprocessed and HPT-processed materials revealed a gradual evolution from a prismatic {1010} fiber to an ultimate basal {0001} fiber texture with the c-axis parallel to the normal direction. The majority of grain boundaries had misorientations larger than 15o throughout the processing.
The strain hardening tended towards a reasonable hardness homogeneity with a hardenability exponent, η, of 0.07 up to strains of ~20 and with a subsequent hardness saturation at Hv » 125.
Text
Shima-JAC2017-accepted manuscript
- Accepted Manuscript
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Accepted/In Press date: 5 April 2017
e-pub ahead of print date: 6 April 2017
Published date: 25 July 2017
Organisations:
Engineering Mats & Surface Engineerg Gp
Identifiers
Local EPrints ID: 407859
URI: http://eprints.soton.ac.uk/id/eprint/407859
PURE UUID: bb743329-71b4-48b8-8280-0f3e5bb2f10d
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Date deposited: 27 Apr 2017 01:07
Last modified: 16 Mar 2024 05:15
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Contributors
Author:
Seyed A. Torbati-Sarraf
Author:
Shima Sabbaghianrad
Author:
Roberto B. Figueiredo
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