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Evolution of hardness, microstructure, and strain rate sensitivity in a Zn-22% Al eutectoid alloy processed by high-pressure torsion

Evolution of hardness, microstructure, and strain rate sensitivity in a Zn-22% Al eutectoid alloy processed by high-pressure torsion
Evolution of hardness, microstructure, and strain rate sensitivity in a Zn-22% Al eutectoid alloy processed by high-pressure torsion
Severe plastic deformation (SPD) is an attractive processing method for refining microstructures of metallic materials to give ultrafine grain sizes within the submicrometer to even the nanometer levels. Experiments were conducted to discuss the evolution of hardness, microstructure and strain rate sensitivity, m, in a Zn-22% Al eutectoid alloy processed by high- pressure torsion (HPT). The data from microhardness and nanoindentation hardness measurements revealed that there is a significant weakening in the Zn-Al alloy during HPT despite extensive grain refinement. Excellent room-temperature (RT) plasticity was observed in the alloy after HPT from nanoindentation creep in terms of an increased value of m. The microstructural changes with increasing numbers of HPT turns show a strong correlation with the change in the m value. Moerover, the excellent RT plasticity in the alloy is discussed in terms of the enhanced level of grain boundary sliding and the evolution of microsturucture.

1757-899X
12101
Kawasaki, Megumi
944ba471-eb78-46db-bfb7-3f0296d9ef6d
Lee, Han-Joo
dfea332e-c7bd-49d9-b544-c62baab464bf
Choi, In-Chul
7a33a581-e44b-4f53-8ded-5e46af6f5506
Jang, Jae-il
c8160c1e-ce1b-4518-8a52-930cb9f54800
Ahn, Byungmin
92fd09aa-9424-4020-ae74-02dd129f470f
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Kawasaki, Megumi
944ba471-eb78-46db-bfb7-3f0296d9ef6d
Lee, Han-Joo
dfea332e-c7bd-49d9-b544-c62baab464bf
Choi, In-Chul
7a33a581-e44b-4f53-8ded-5e46af6f5506
Jang, Jae-il
c8160c1e-ce1b-4518-8a52-930cb9f54800
Ahn, Byungmin
92fd09aa-9424-4020-ae74-02dd129f470f
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86

Kawasaki, Megumi, Lee, Han-Joo, Choi, In-Chul, Jang, Jae-il, Ahn, Byungmin and Langdon, Terence G. (2014) Evolution of hardness, microstructure, and strain rate sensitivity in a Zn-22% Al eutectoid alloy processed by high-pressure torsion. IOP Conference Series: Materials Science and Engineering, 63, 12101. (doi:10.1088/1757-899X/63/1/012101).

Record type: Article

Abstract

Severe plastic deformation (SPD) is an attractive processing method for refining microstructures of metallic materials to give ultrafine grain sizes within the submicrometer to even the nanometer levels. Experiments were conducted to discuss the evolution of hardness, microstructure and strain rate sensitivity, m, in a Zn-22% Al eutectoid alloy processed by high- pressure torsion (HPT). The data from microhardness and nanoindentation hardness measurements revealed that there is a significant weakening in the Zn-Al alloy during HPT despite extensive grain refinement. Excellent room-temperature (RT) plasticity was observed in the alloy after HPT from nanoindentation creep in terms of an increased value of m. The microstructural changes with increasing numbers of HPT turns show a strong correlation with the change in the m value. Moerover, the excellent RT plasticity in the alloy is discussed in terms of the enhanced level of grain boundary sliding and the evolution of microsturucture.

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More information

Published date: 2014
Organisations: Engineering Mats & Surface Engineerg Gp

Identifiers

Local EPrints ID: 368099
URI: http://eprints.soton.ac.uk/id/eprint/368099
ISSN: 1757-899X
PURE UUID: 907f645f-e36d-440d-a4c7-aae66c9c39f4
ORCID for Terence G. Langdon: ORCID iD orcid.org/0000-0003-3541-9250

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Date deposited: 09 Sep 2014 10:35
Last modified: 15 Mar 2024 03:13

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Contributors

Author: Megumi Kawasaki
Author: Han-Joo Lee
Author: In-Chul Choi
Author: Jae-il Jang
Author: Byungmin Ahn

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