Effects of aging temperature on electrical conductivity and hardness of Cu-3 at. pct Ti alloy aged in a hydrogen atmosphere

Handle URI:
http://hdl.handle.net/10754/334620
Title:
Effects of aging temperature on electrical conductivity and hardness of Cu-3 at. pct Ti alloy aged in a hydrogen atmosphere
Authors:
Semboshi, S.; Nishida, T.; Numakura, H.; Al-Kassab, T.; Kirchheim, R.
Abstract:
To improve the balance of the electrical conductivity and mechanical strength for dilute Cu-Ti alloys by aging in a hydrogen atmosphere, the influence of aging temperature ranging from 673 K to 773 K (400 °C to 500 °C) on the properties of Cu-3 at. pct Ti alloy was studied. The Vickers hardness increases steadily with aging time and starts to fall at 3 hours at 773 K (500 °C), 10 hours at 723 K (450 °C), or over 620 hours at 673 K (400 °C), which is the same as the case of conventional aging in vacuum. The maximum hardness increases from 220 to 236 with the decrease of aging temperature, which is slightly lower than aging at the same temperature in vacuum. The electrical conductivity at the maximum hardness also increases from 18 to 32 pct of pure copper with the decrease of the temperature, which is enhanced by a factor of 1.3 to 1.5 in comparison to aging in vacuum. Thus, aging at 673 K (400 °C) in a hydrogen atmosphere renders fairly good balance of strength and conductivity, although it takes nearly a month to achieve. The microstructural changes during aging were examined by transmission electron microscopy (TEM) and atom-probe tomography (APT), it was confirmed that precipitation of the Cu4Ti phase occurs first and then particles of TiH2 form as the third phase, thereby efficiently removing the Ti solutes in the matrix.
KAUST Department:
Physical Sciences and Engineering (PSE) Division
Citation:
Semboshi S, Nishida T, Numakura H, Al-Kassab T, Kirchheim R (2011) Effects of Aging Temperature on Electrical Conductivity and Hardness of Cu-3 at. pct Ti Alloy Aged in a Hydrogen Atmosphere. Metallurgical and Materials Transactions A 42: 2136-2143. doi:10.1007/s11661-011-0637-8.
Publisher:
Springer Nature
Journal:
Metallurgical and Materials Transactions A
Issue Date:
1-Aug-2011
DOI:
10.1007/s11661-011-0637-8
Type:
Article
ISSN:
10735623
Appears in Collections:
Articles; Physical Sciences and Engineering (PSE) Division

Full metadata record

DC FieldValue Language
dc.contributor.authorSemboshi, S.en
dc.contributor.authorNishida, T.en
dc.contributor.authorNumakura, H.en
dc.contributor.authorAl-Kassab, T.en
dc.contributor.authorKirchheim, R.en
dc.date.accessioned2014-11-11T14:32:22Z-
dc.date.available2014-11-11T14:32:22Z-
dc.date.issued2011-08-01en
dc.identifier.citationSemboshi S, Nishida T, Numakura H, Al-Kassab T, Kirchheim R (2011) Effects of Aging Temperature on Electrical Conductivity and Hardness of Cu-3 at. pct Ti Alloy Aged in a Hydrogen Atmosphere. Metallurgical and Materials Transactions A 42: 2136-2143. doi:10.1007/s11661-011-0637-8.en
dc.identifier.issn10735623en
dc.identifier.doi10.1007/s11661-011-0637-8en
dc.identifier.urihttp://hdl.handle.net/10754/334620en
dc.description.abstractTo improve the balance of the electrical conductivity and mechanical strength for dilute Cu-Ti alloys by aging in a hydrogen atmosphere, the influence of aging temperature ranging from 673 K to 773 K (400 °C to 500 °C) on the properties of Cu-3 at. pct Ti alloy was studied. The Vickers hardness increases steadily with aging time and starts to fall at 3 hours at 773 K (500 °C), 10 hours at 723 K (450 °C), or over 620 hours at 673 K (400 °C), which is the same as the case of conventional aging in vacuum. The maximum hardness increases from 220 to 236 with the decrease of aging temperature, which is slightly lower than aging at the same temperature in vacuum. The electrical conductivity at the maximum hardness also increases from 18 to 32 pct of pure copper with the decrease of the temperature, which is enhanced by a factor of 1.3 to 1.5 in comparison to aging in vacuum. Thus, aging at 673 K (400 °C) in a hydrogen atmosphere renders fairly good balance of strength and conductivity, although it takes nearly a month to achieve. The microstructural changes during aging were examined by transmission electron microscopy (TEM) and atom-probe tomography (APT), it was confirmed that precipitation of the Cu4Ti phase occurs first and then particles of TiH2 form as the third phase, thereby efficiently removing the Ti solutes in the matrix.en
dc.language.isoenen
dc.publisherSpringer Natureen
dc.rightsThis is an Open Access article distributed under the terms of the Creative Commons-Attribution Noncommercial License, which permits unrestricted noncommercial use, distribution, and reproduction in any medium, provided the original author(s) and source are credited.en
dc.rightsArchived with thanks to Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Scienceen
dc.rights.urihttp://creativecommons.org/licenses/by-nc/3.0/en
dc.subjectAging temperaturesen
dc.subjectAging timeen
dc.subjectAtom-probe tomographyen
dc.subjectCu-Ti alloysen
dc.subjectElectrical conductivityen
dc.subjectHydrogen atmosphereen
dc.subjectIn-vacuumen
dc.subjectmatrixen
dc.subjectMaximum hardnessen
dc.subjectMicrostructural changesen
dc.subjectPure copperen
dc.subjectThird phaseen
dc.subjectTi alloysen
dc.subjectAlloysen
dc.subjectAtmospheric temperatureen
dc.subjectCopper alloysen
dc.subjectElectric conductivityen
dc.subjectHydrogenen
dc.subjectTransmission electron microscopyen
dc.subjectVacuumen
dc.subjectVickers hardnessen
dc.subjectTitanium alloysen
dc.titleEffects of aging temperature on electrical conductivity and hardness of Cu-3 at. pct Ti alloy aged in a hydrogen atmosphereen
dc.typeArticleen
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.identifier.journalMetallurgical and Materials Transactions Aen
dc.eprint.versionPublisher's Version/PDFen
dc.contributor.institutionInstitute for Materials Research, Tohoku University, Sendai, Aoba-ku 980-8577, Japanen
dc.contributor.institutionDepartment of Materials Science, Osaka Prefecture University, Sakai 599-8531, Japanen
dc.contributor.institutionJTEKT Corporation, Kashihara Nara 634-8555, Japanen
dc.contributor.institutionInstitute for Material Physics, University of Gottingen, Gottingen 37073, Germanyen
dc.contributor.affiliationKing Abdullah University of Science and Technology (KAUST)en
kaust.authorAl-Kassab, Talaaten
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