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An examination of microstructural evolution in a Pb-Sn eutectic alloy processed by high-pressure torsion and subsequent self-annealing.

Zhang, N.X., Kawasaki, M., Huang, Y. and Langdon, T.G., 2021. An examination of microstructural evolution in a Pb-Sn eutectic alloy processed by high-pressure torsion and subsequent self-annealing. Materials Science and Engineering A, 802 (January), 140653.

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DOI: 10.1016/j.msea.2020.140653

Abstract

The Pb-Sn alloy has a wide use in the electronic, energy storage and nuclear industries and a fine-grained Pb-Sn alloy may open up new possibilities for applications in these industries. In order to understand the behavior of grain refinement, a Pb-62% Sn eutectic alloy was processed by high-pressure torsion (HPT), stored at room temperature (RT) and then the microstructures of the alloy after HPT were repeatedly investigated during the course of self-annealing using electron backscatter diffraction, scanning electron microscopy and transmission electron microscopy. It is demonstrated that there is a large fraction of twin boundaries with a twin relationship of 62.8°<100> in the microstructure of the initial as-cast condition. Due to the presence of the high imposed pressure, the mobility of Ʃ21 boundaries at 71° is greatly favoured during processing by HPT. After the high pressure is removed, the mobility of dislocation-twin boundaries near 62.8°<100> is then favoured. Processing by HPT significantly increases the solubility of Sn in the Pb phase. The supersaturated state of Sn in Pb is not stable during self-annealing at RT and instead a decomposition of Sn from the Pb-rich phase is observed after storage for 16 days. The main mechanism for this decomposition is lattice diffusion.

Item Type:Article
ISSN:0921-5093
Uncontrolled Keywords:High-pressure torsion; Pb-Sn alloy; Self-annealing; solubility; twin boundaries
Group:Faculty of Science & Technology
ID Code:34946
Deposited By: Unnamed user with email symplectic@symplectic
Deposited On:08 Dec 2020 13:30
Last Modified:15 Aug 2021 08:27

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