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Microstructural evolution and mechanical properties in a Zn-Al eutectoid alloy processed by high-pressure torsion

Microstructural evolution and mechanical properties in a Zn-Al eutectoid alloy processed by high-pressure torsion
Microstructural evolution and mechanical properties in a Zn-Al eutectoid alloy processed by high-pressure torsion
Experiments were conducted to examine the evolution of microstructure and mechanical properties in a Zn–22% Al eutectoid alloy processed by high-pressure torsion (HPT). Measurements of the Vickers microhardness revealed significant weakening in the alloy after HPT, and microstructural analysis showed that the initial duplex structure, consisting of equiaxed grains and lamellae, was retained at the disk centers after HPT, whereas equiaxed fine grains were observed at the disk edges. Direct evidence is presented for a transformation of the lamellae into equiaxed very fine grains and subsequent dynamic recrystallization in the early stages of HPT. The reduction of the lamellar structure and the loss of Zn precipitates account for the weakening in the alloy in HPT processing. Excellent high strain rate superplasticity was recorded after HPT, with elongations up to ?1800% at 473 K at a strain rate of 10?1 s?1. The experiments show that the maximum elongations are displaced to faster strain rates with increasing numbers of HPT turns
1359-6454
67-69
Cho, T.S.
a80ec783-c440-4a32-b46b-cecb1fc344f5
Lee, H.J.
a0feb7f7-b8ca-4e74-946d-17bbdf39a186
Ahn, B.
0b971678-64a2-4079-9cae-f8a6923eb9e2
Kawasaki, M.
d0ce18b9-8403-4db2-9cb2-3a6165f288a6
Langdon, T.G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Cho, T.S.
a80ec783-c440-4a32-b46b-cecb1fc344f5
Lee, H.J.
a0feb7f7-b8ca-4e74-946d-17bbdf39a186
Ahn, B.
0b971678-64a2-4079-9cae-f8a6923eb9e2
Kawasaki, M.
d0ce18b9-8403-4db2-9cb2-3a6165f288a6
Langdon, T.G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86

Cho, T.S., Lee, H.J., Ahn, B., Kawasaki, M. and Langdon, T.G. (2014) Microstructural evolution and mechanical properties in a Zn-Al eutectoid alloy processed by high-pressure torsion. Acta Materialia, 72, 67-69. (doi:10.1016/j.actamat.2014.03.026).

Record type: Article

Abstract

Experiments were conducted to examine the evolution of microstructure and mechanical properties in a Zn–22% Al eutectoid alloy processed by high-pressure torsion (HPT). Measurements of the Vickers microhardness revealed significant weakening in the alloy after HPT, and microstructural analysis showed that the initial duplex structure, consisting of equiaxed grains and lamellae, was retained at the disk centers after HPT, whereas equiaxed fine grains were observed at the disk edges. Direct evidence is presented for a transformation of the lamellae into equiaxed very fine grains and subsequent dynamic recrystallization in the early stages of HPT. The reduction of the lamellar structure and the loss of Zn precipitates account for the weakening in the alloy in HPT processing. Excellent high strain rate superplasticity was recorded after HPT, with elongations up to ?1800% at 473 K at a strain rate of 10?1 s?1. The experiments show that the maximum elongations are displaced to faster strain rates with increasing numbers of HPT turns

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

Identifiers

Local EPrints ID: 364438
URI: http://eprints.soton.ac.uk/id/eprint/364438
ISSN: 1359-6454
PURE UUID: c3809297-6096-49f2-9bd8-b6dbd222b5f4
ORCID for T.G. Langdon: ORCID iD orcid.org/0000-0003-3541-9250

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Date deposited: 28 Apr 2014 12:47
Last modified: 15 Mar 2024 03:13

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Contributors

Author: T.S. Cho
Author: H.J. Lee
Author: B. Ahn
Author: M. Kawasaki
Author: T.G. Langdon ORCID iD

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