Exploiting tube high-pressure shearing to prepare a microstructure in Pb-Sn alloys for unprecedented superplasticity
Exploiting tube high-pressure shearing to prepare a microstructure in Pb-Sn alloys for unprecedented superplasticity
Superplastic Pb-Sn alloys were produced via tube high-pressure shearing (t-HPS), in a single step starting from elemental solid bulks. A Pb-40 wt% Sn alloy showed an exceptional superplastic elongation as high as ∼1870% at a strain rate of 1.0 × 10
−3 s
−1 at room temperature, thereby elevating the optimum strain rate for maximum elongation under these conditions by more than one order of magnitude over conventional cast Pb-Sn alloys. This unprecedented room temperature superplasticity is attributed to the equiaxed grains having uniform sizes of the order of one micrometer, and in particular to the well-mixed domains of Pb and Sn in nearly equal proportions. This microstructure cannot be attained in cast eutectic or hypoeutectic alloys through conventional thermomechanical processing, but instead it is a direct outcome of t-HPS-generated compositional patterning at room temperature.
Compositional patterning, Pb-Sn alloys, severe plastic deformation, superplasticity, tube high-pressure shearing
Lin, Kui
1ee783bd-01c2-4fbe-8150-41605ad19366
Li, Zheng
7bd62f81-c407-46c3-a573-b7a2edf2ee52
Liu, Ying
300e627e-a3dd-44b0-be1e-d2ccda0b7b83
Ma, En
3b6b91ab-c5ba-4211-a5e6-6a94d65642a5
Wang, Jing Tao
e53673c2-1671-4437-ab59-412a670146aa
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
1 March 2022
Lin, Kui
1ee783bd-01c2-4fbe-8150-41605ad19366
Li, Zheng
7bd62f81-c407-46c3-a573-b7a2edf2ee52
Liu, Ying
300e627e-a3dd-44b0-be1e-d2ccda0b7b83
Ma, En
3b6b91ab-c5ba-4211-a5e6-6a94d65642a5
Wang, Jing Tao
e53673c2-1671-4437-ab59-412a670146aa
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Lin, Kui, Li, Zheng, Liu, Ying, Ma, En, Wang, Jing Tao and Langdon, Terence G.
(2022)
Exploiting tube high-pressure shearing to prepare a microstructure in Pb-Sn alloys for unprecedented superplasticity.
Scripta Materialia, 209, [114390].
(doi:10.1016/j.scriptamat.2021.114390).
Abstract
Superplastic Pb-Sn alloys were produced via tube high-pressure shearing (t-HPS), in a single step starting from elemental solid bulks. A Pb-40 wt% Sn alloy showed an exceptional superplastic elongation as high as ∼1870% at a strain rate of 1.0 × 10
−3 s
−1 at room temperature, thereby elevating the optimum strain rate for maximum elongation under these conditions by more than one order of magnitude over conventional cast Pb-Sn alloys. This unprecedented room temperature superplasticity is attributed to the equiaxed grains having uniform sizes of the order of one micrometer, and in particular to the well-mixed domains of Pb and Sn in nearly equal proportions. This microstructure cannot be attained in cast eutectic or hypoeutectic alloys through conventional thermomechanical processing, but instead it is a direct outcome of t-HPS-generated compositional patterning at room temperature.
Text
JTWang-SMM-final
- Accepted Manuscript
More information
Accepted/In Press date: 29 October 2021
e-pub ahead of print date: 20 November 2021
Published date: 1 March 2022
Additional Information:
Funding Information:
This work was supported by the National Key R&D Program of China (Grant No. 2017YFA0204403) and the National Natural Science Foundation of China (Grant No. 52074160). E.M. acknowledges XJTU for hosting his work at the Center for Alloy Innovation and Design (CAID). T.G.L. was supported by the European Research Council under Grant Agreement No. 267464-SPDMETALS. The EBSD experiments were performed at the Materials Characterization and Research Center of Nanjing University of Science and Technology.
Keywords:
Compositional patterning, Pb-Sn alloys, severe plastic deformation, superplasticity, tube high-pressure shearing
Identifiers
Local EPrints ID: 452192
URI: http://eprints.soton.ac.uk/id/eprint/452192
ISSN: 1359-6462
PURE UUID: 4ddb989e-cc30-4fcb-bd23-1546d056ae3b
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Date deposited: 29 Nov 2021 17:32
Last modified: 17 Mar 2024 06:56
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Contributors
Author:
Kui Lin
Author:
Zheng Li
Author:
Ying Liu
Author:
En Ma
Author:
Jing Tao Wang
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