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Valence Electron Ratio for Design of Shape Memory Alloys with Desired Phase Transformation Temperatures

Mehrdad Zarinejad, Kiyo Wada, Farshid Pahlevani, Reza Katal, Sajjad Rimaz

Shape Memory and Superelasticity, Volume: 7, Issue: 1, Pages: 179 - 189

Swansea University Author: Kiyo Wada

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DOI (Published version): 10.1007/s40830-021-00319-0

Abstract

Dependence of phase transformation temperatures of TiPd- and TiPt-based shape memory alloys on valence electron ratio (VER), number (ev/a), and average atomic number of the alloys (Z) are investigated. The alloys have medium numbers of valence electrons (6.6 ≤ ev/a ≤ 7.3) that are near 7 and a wide...

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Published in: Shape Memory and Superelasticity
ISSN: 2199-384X 2199-3858
Published: Springer Science and Business Media LLC 2021
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URI: https://cronfa.swan.ac.uk/Record/cronfa56691
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first_indexed 2021-04-19T13:22:34Z
last_indexed 2021-05-22T03:24:05Z
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spelling 2021-05-21T12:05:07.9024126 v2 56691 2021-04-19 Valence Electron Ratio for Design of Shape Memory Alloys with Desired Phase Transformation Temperatures 15e59ea2d2602d5c6319b5e5c446d5a7 Kiyo Wada Kiyo Wada true false 2021-04-19 AERO Dependence of phase transformation temperatures of TiPd- and TiPt-based shape memory alloys on valence electron ratio (VER), number (ev/a), and average atomic number of the alloys (Z) are investigated. The alloys have medium numbers of valence electrons (6.6 ≤ ev/a ≤ 7.3) that are near 7 and a wide range of the average atomic number (Z = 25–54). The forward and reverse phase transformation temperatures, Ms and (As), increase with average atomic number of the alloys, respectively. Clear correlations between transformation temperatures and VER are found. Ms and (As) both decrease from around 1184 °C (1175 °C) to as low as 20 °C (32 °C), respectively, with increasing VER from 0.134 to 0.270. Temperature hysteresis of the thermoelastic transformation in these alloys tends to decrease with increasing VER. Dependence of transformation temperatures and temperature hysteresis of these shape memory alloys on VER is discussed based on the variations of elastic moduli and atomic bonding due to composition change. Journal Article Shape Memory and Superelasticity 7 1 179 189 Springer Science and Business Media LLC 2199-384X 2199-3858 phase transformation temperature, valence electron, shape memory alloy, TiPd, Ti Pt, intermetallics 25 3 2021 2021-03-25 10.1007/s40830-021-00319-0 COLLEGE NANME Aerospace Engineering COLLEGE CODE AERO Swansea University 2021-05-21T12:05:07.9024126 2021-04-19T14:19:22.6995320 Faculty of Science and Engineering School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Aerospace Engineering Mehrdad Zarinejad 1 Kiyo Wada 2 Farshid Pahlevani 3 Reza Katal 4 Sajjad Rimaz 5 56691__19724__7dd8d9cb585b45c3870f9aa4e4e57dfc.pdf 56691.pdf 2021-04-21T09:20:45.5953791 Output 889394 application/pdf Accepted Manuscript true 2022-03-25T00:00:00.0000000 true eng http://creativecommons.org/licenses/by-nc-nd/4.0/
title Valence Electron Ratio for Design of Shape Memory Alloys with Desired Phase Transformation Temperatures
spellingShingle Valence Electron Ratio for Design of Shape Memory Alloys with Desired Phase Transformation Temperatures
Kiyo Wada
title_short Valence Electron Ratio for Design of Shape Memory Alloys with Desired Phase Transformation Temperatures
title_full Valence Electron Ratio for Design of Shape Memory Alloys with Desired Phase Transformation Temperatures
title_fullStr Valence Electron Ratio for Design of Shape Memory Alloys with Desired Phase Transformation Temperatures
title_full_unstemmed Valence Electron Ratio for Design of Shape Memory Alloys with Desired Phase Transformation Temperatures
title_sort Valence Electron Ratio for Design of Shape Memory Alloys with Desired Phase Transformation Temperatures
author_id_str_mv 15e59ea2d2602d5c6319b5e5c446d5a7
author_id_fullname_str_mv 15e59ea2d2602d5c6319b5e5c446d5a7_***_Kiyo Wada
author Kiyo Wada
author2 Mehrdad Zarinejad
Kiyo Wada
Farshid Pahlevani
Reza Katal
Sajjad Rimaz
format Journal article
container_title Shape Memory and Superelasticity
container_volume 7
container_issue 1
container_start_page 179
publishDate 2021
institution Swansea University
issn 2199-384X
2199-3858
doi_str_mv 10.1007/s40830-021-00319-0
publisher Springer Science and Business Media LLC
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Aerospace Engineering{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Aerospace Engineering
document_store_str 1
active_str 0
description Dependence of phase transformation temperatures of TiPd- and TiPt-based shape memory alloys on valence electron ratio (VER), number (ev/a), and average atomic number of the alloys (Z) are investigated. The alloys have medium numbers of valence electrons (6.6 ≤ ev/a ≤ 7.3) that are near 7 and a wide range of the average atomic number (Z = 25–54). The forward and reverse phase transformation temperatures, Ms and (As), increase with average atomic number of the alloys, respectively. Clear correlations between transformation temperatures and VER are found. Ms and (As) both decrease from around 1184 °C (1175 °C) to as low as 20 °C (32 °C), respectively, with increasing VER from 0.134 to 0.270. Temperature hysteresis of the thermoelastic transformation in these alloys tends to decrease with increasing VER. Dependence of transformation temperatures and temperature hysteresis of these shape memory alloys on VER is discussed based on the variations of elastic moduli and atomic bonding due to composition change.
published_date 2021-03-25T04:11:50Z
_version_ 1763753811415924736
score 11.012813

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