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Microstructural modification of Sn–Bi and Sn–Bi–Al immiscible alloys by shearing

Z. Cassinath, Z. Li, S. Sridhar, A. Das, H. R. Kotadia, Amit Das Orcid Logo

Materials Science and Technology, Volume: 35, Issue: 18, Pages: 2157 - 2164

Swansea University Author: Amit Das Orcid Logo

Abstract

Sn–20 wt-%Bi and immiscible Sn–20 wt-%Bi–1 wt-%Al alloys were used to understand the effect of high-intensity shearing on microstructural refinement. Novel ACME (Axial Centrifugal Metal Expeller) shearing device, based on axial compressor and rotor–stator mechanism to generate high shear rate and in...

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Published in: Materials Science and Technology
ISSN: 0267-0836 1743-2847
Published: Informa UK Limited 2019
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URI: https://cronfa.swan.ac.uk/Record/cronfa51938
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first_indexed 2019-09-18T14:19:04Z
last_indexed 2020-07-21T13:13:20Z
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spelling 2020-07-21T12:41:25.2477010 v2 51938 2019-09-18 Microstructural modification of Sn–Bi and Sn–Bi–Al immiscible alloys by shearing 4d785df766daed9a857c934bb130ed8b 0000-0002-7196-6254 Amit Das Amit Das true false 2019-09-18 MTLS Sn–20 wt-%Bi and immiscible Sn–20 wt-%Bi–1 wt-%Al alloys were used to understand the effect of high-intensity shearing on microstructural refinement. Novel ACME (Axial Centrifugal Metal Expeller) shearing device, based on axial compressor and rotor–stator mechanism to generate high shear rate and intense turbulence, was used to condition the melts prior to solidification. Microstructure in the Sn–Bi alloy deviated from dendritic grains with coarse eutectic pockets under conventional solidification to compact grains with well-dispersed eutectic under semisolid-state shearing. Decreasing the shearing temperature and increasing shearing time increased the globularity of grains. Following shearing, remnant liquid solidified into fine grain structure. In the immiscible Sn–Bi–Al alloy, shearing produced uniform dispersion of refined Al-rich particles in Sn-rich matrix as opposed to severe segregation under conventional solidification. The primary effect of shearing appears to originate from the thermo-solutal homogenisation of the melt and its effect on interface stability during solidification. Journal Article Materials Science and Technology 35 18 2157 2164 Informa UK Limited 0267-0836 1743-2847 Solidification, microstructure, semisolid, Sn alloys, immiscible, coarsening, grain refinement, melt shearing 12 12 2019 2019-12-12 10.1080/02670836.2019.1661659 COLLEGE NANME Materials Science and Engineering COLLEGE CODE MTLS Swansea University 2020-07-21T12:41:25.2477010 2019-09-18T13:06:55.6209945 Z. Cassinath 1 Z. Li 2 S. Sridhar 3 A. Das 4 H. R. Kotadia 5 Amit Das 0000-0002-7196-6254 6 51938__15301__03d56daadb3449d38a0325ea95a3e7fe.pdf ADMST2019.pdf 2019-09-18T13:27:33.8200000 Output 1226005 application/pdf Accepted Manuscript true 2020-09-17T00:00:00.0000000 false eng
title Microstructural modification of Sn–Bi and Sn–Bi–Al immiscible alloys by shearing
spellingShingle Microstructural modification of Sn–Bi and Sn–Bi–Al immiscible alloys by shearing
Amit Das
title_short Microstructural modification of Sn–Bi and Sn–Bi–Al immiscible alloys by shearing
title_full Microstructural modification of Sn–Bi and Sn–Bi–Al immiscible alloys by shearing
title_fullStr Microstructural modification of Sn–Bi and Sn–Bi–Al immiscible alloys by shearing
title_full_unstemmed Microstructural modification of Sn–Bi and Sn–Bi–Al immiscible alloys by shearing
title_sort Microstructural modification of Sn–Bi and Sn–Bi–Al immiscible alloys by shearing
author_id_str_mv 4d785df766daed9a857c934bb130ed8b
author_id_fullname_str_mv 4d785df766daed9a857c934bb130ed8b_***_Amit Das
author Amit Das
author2 Z. Cassinath
Z. Li
S. Sridhar
A. Das
H. R. Kotadia
Amit Das
format Journal article
container_title Materials Science and Technology
container_volume 35
container_issue 18
container_start_page 2157
publishDate 2019
institution Swansea University
issn 0267-0836
1743-2847
doi_str_mv 10.1080/02670836.2019.1661659
publisher Informa UK Limited
document_store_str 1
active_str 0
description Sn–20 wt-%Bi and immiscible Sn–20 wt-%Bi–1 wt-%Al alloys were used to understand the effect of high-intensity shearing on microstructural refinement. Novel ACME (Axial Centrifugal Metal Expeller) shearing device, based on axial compressor and rotor–stator mechanism to generate high shear rate and intense turbulence, was used to condition the melts prior to solidification. Microstructure in the Sn–Bi alloy deviated from dendritic grains with coarse eutectic pockets under conventional solidification to compact grains with well-dispersed eutectic under semisolid-state shearing. Decreasing the shearing temperature and increasing shearing time increased the globularity of grains. Following shearing, remnant liquid solidified into fine grain structure. In the immiscible Sn–Bi–Al alloy, shearing produced uniform dispersion of refined Al-rich particles in Sn-rich matrix as opposed to severe segregation under conventional solidification. The primary effect of shearing appears to originate from the thermo-solutal homogenisation of the melt and its effect on interface stability during solidification.
published_date 2019-12-12T04:05:39Z
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score 10.916527