Staff View: X-phase precipitation in aging of Cu-Al-Ni-xTi shape memory alloys and its influence on phase transition behavior

X-phase precipitation in aging of Cu-Al-Ni-xTi shape memory alloys and its influence on phase transition behavior

The present work aims to investigate the aging treatment effects on the microstructure, transition characteristics, and mechanical properties of Cu-Al-Ni-xTi shape memory alloys. The aging treatment of the homogenized and modified alloys of Cu-Al-Ni-xTi results in variations of the martensite morpho...

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Main Authors:	Saud, Safaa Najah, Hamzah, Esah, Abu Bakar, Tuty Asma, Bakhsheshi-Rad, Hamid Reza, Hosseinian, Raheleh
Format:	Article
Published:	Springer Netherlands 2016
Subjects:	TJ Mechanical engineering and machinery
Online Access:	http://eprints.utm.my/id/eprint/71384/ https://www.scopus.com/inward/record.uri?eid=2-s2.0-84953410543&doi=10.1007%2fs10973-015-4894-4&partnerID=40&md5=4e4aaaeba7c2adb686fa47ddca221744
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spelling	my.utm.713842017-11-20T08:30:36Z http://eprints.utm.my/id/eprint/71384/ X-phase precipitation in aging of Cu-Al-Ni-xTi shape memory alloys and its influence on phase transition behavior Saud, Safaa Najah Hamzah, Esah Abu Bakar, Tuty Asma Bakhsheshi-Rad, Hamid Reza Hosseinian, Raheleh TJ Mechanical engineering and machinery The present work aims to investigate the aging treatment effects on the microstructure, transition characteristics, and mechanical properties of Cu-Al-Ni-xTi shape memory alloys. The aging treatment of the homogenized and modified alloys of Cu-Al-Ni-xTi results in variations of the martensite morphology, volume fraction, and precipitate size. These variations in the features of precipitates have an obvious effect on transition behavior and mechanical properties. The transition temperatures are increased slightly with an increase in the aging time and temperatures; such increase is mainly attributed to changes in the γ′1 and β′1 morphology and distribution, along with the precipitates. The thermodynamic parameters (ΔH and ΔS) tend to decrease with an increase in the aging time and temperatures. Moreover, the brittleness, low strength, and poor processability of Cu-Al-Ni alloys greatly limit their application. We attempted to improve the mechanical properties without losing the thermoelastic properties through the additions of Ti and appropriate aging treatments. The highest tensile strength and strain of 640 MPa and 4.3 % were obtained in alloy of Cu-Al-Ni-0.7 mass% Ti aged at 250 °C for 24 h and 100 °C for 48 h, respectively. The shape memory behavior of the alloys was studied using a specially designed machine. The strain recovery by shape memory effect of the alloys increases with an increase in the aging tomes and temperature, where the highest recovery (100 %) is obtained with the alloy of Cu-Al-Ni-0.7 mass% Ti after being aged at 250 °C for 24 h. Springer Netherlands 2016 Article PeerReviewed Saud, Safaa Najah and Hamzah, Esah and Abu Bakar, Tuty Asma and Bakhsheshi-Rad, Hamid Reza and Hosseinian, Raheleh (2016) X-phase precipitation in aging of Cu-Al-Ni-xTi shape memory alloys and its influence on phase transition behavior. Journal of Thermal Analysis and Calorimetry, 123 (1). pp. 377-389. ISSN 1388-6150 https://www.scopus.com/inward/record.uri?eid=2-s2.0-84953410543&doi=10.1007%2fs10973-015-4894-4&partnerID=40&md5=4e4aaaeba7c2adb686fa47ddca221744
institution	Universiti Teknologi Malaysia
building	UTM Library
collection	Institutional Repository
continent	Asia
country	Malaysia
content_provider	Universiti Teknologi Malaysia
content_source	UTM Institutional Repository
url_provider	http://eprints.utm.my/
topic	TJ Mechanical engineering and machinery
spellingShingle	TJ Mechanical engineering and machinery Saud, Safaa Najah Hamzah, Esah Abu Bakar, Tuty Asma Bakhsheshi-Rad, Hamid Reza Hosseinian, Raheleh X-phase precipitation in aging of Cu-Al-Ni-xTi shape memory alloys and its influence on phase transition behavior
description	The present work aims to investigate the aging treatment effects on the microstructure, transition characteristics, and mechanical properties of Cu-Al-Ni-xTi shape memory alloys. The aging treatment of the homogenized and modified alloys of Cu-Al-Ni-xTi results in variations of the martensite morphology, volume fraction, and precipitate size. These variations in the features of precipitates have an obvious effect on transition behavior and mechanical properties. The transition temperatures are increased slightly with an increase in the aging time and temperatures; such increase is mainly attributed to changes in the γ′1 and β′1 morphology and distribution, along with the precipitates. The thermodynamic parameters (ΔH and ΔS) tend to decrease with an increase in the aging time and temperatures. Moreover, the brittleness, low strength, and poor processability of Cu-Al-Ni alloys greatly limit their application. We attempted to improve the mechanical properties without losing the thermoelastic properties through the additions of Ti and appropriate aging treatments. The highest tensile strength and strain of 640 MPa and 4.3 % were obtained in alloy of Cu-Al-Ni-0.7 mass% Ti aged at 250 °C for 24 h and 100 °C for 48 h, respectively. The shape memory behavior of the alloys was studied using a specially designed machine. The strain recovery by shape memory effect of the alloys increases with an increase in the aging tomes and temperature, where the highest recovery (100 %) is obtained with the alloy of Cu-Al-Ni-0.7 mass% Ti after being aged at 250 °C for 24 h.
format	Article
author	Saud, Safaa Najah Hamzah, Esah Abu Bakar, Tuty Asma Bakhsheshi-Rad, Hamid Reza Hosseinian, Raheleh
author_facet	Saud, Safaa Najah Hamzah, Esah Abu Bakar, Tuty Asma Bakhsheshi-Rad, Hamid Reza Hosseinian, Raheleh
author_sort	Saud, Safaa Najah
title	X-phase precipitation in aging of Cu-Al-Ni-xTi shape memory alloys and its influence on phase transition behavior
title_short	X-phase precipitation in aging of Cu-Al-Ni-xTi shape memory alloys and its influence on phase transition behavior
title_full	X-phase precipitation in aging of Cu-Al-Ni-xTi shape memory alloys and its influence on phase transition behavior
title_fullStr	X-phase precipitation in aging of Cu-Al-Ni-xTi shape memory alloys and its influence on phase transition behavior
title_full_unstemmed	X-phase precipitation in aging of Cu-Al-Ni-xTi shape memory alloys and its influence on phase transition behavior
title_sort	x-phase precipitation in aging of cu-al-ni-xti shape memory alloys and its influence on phase transition behavior
publisher	Springer Netherlands
publishDate	2016
url	http://eprints.utm.my/id/eprint/71384/ https://www.scopus.com/inward/record.uri?eid=2-s2.0-84953410543&doi=10.1007%2fs10973-015-4894-4&partnerID=40&md5=4e4aaaeba7c2adb686fa47ddca221744
_version_	1643656180986281984
score	13.211869

X-phase precipitation in aging of Cu-Al-Ni-xTi shape memory alloys and its influence on phase transition behavior

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