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Article: Removal of martensite stabilisation in CANTiM shape memory alloy by post-quench ageing

TitleRemoval of martensite stabilisation in CANTiM shape memory alloy by post-quench ageing
Authors
KeywordsMartensite stabilisation
Martensitic transformation
Post-quench ageing
Shape memory alloy
Issue Date1997
PublisherElsevier SA. The Journal's web site is located at http://www.elsevier.com/locate/jmatprotec
Citation
Journal Of Materials Processing Technology, 1997, v. 63 n. 1-3, p. 600-603 How to Cite?
AbstractStep quenching from the solid solution temperature is a common treatment to enhance the shape memory properties in many copper-based shape memory alloys (SMAs). However, the martensite stabilisation problem is more serious in step quenched Cu-Al-Ni-Mn-Ti (CANTiM) SMAs. After step quenching, martensite in CANTiM cannot reverse transform to its parent phase. In contrast, fast quenching rates usually lead to better shape memory properties in CANTiM SMA. When the alloy is directly quenched into KOH, martensite stabilisation is still present. However, martensite stabilisation can be removed by post-quench ageing at 100°C. In rapid quenching from high temperature, a large number of defects such as vacancies are usually produced. The martensite stabilisation due to fast quenching is attributed to the pinning effect of these excessive vacancies. After post-quench ageing, the concentration of vacancies is lowered and thus the pinning effect is reduced. This paper reports the behaviour of vacancies at different cooling rates in different quenching medium, and the effect of post-quench ageing. The evolution of vacancies in the alloy is studied using positron annihilation techniques. In contrast to the martensite stabilisation due to ageing at higher temperatures, the martensite stabilisation due to fast quenching rate can be removed by a carefully chosen low temperature ageing programme.
Persistent Identifierhttp://hdl.handle.net/10722/174733
ISSN
2015 Impact Factor: 2.359
2015 SCImago Journal Rankings: 1.464
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorLam, CWHen_HK
dc.contributor.authorChung, CYen_HK
dc.contributor.authorLing, CCen_HK
dc.contributor.authorFung, Sen_HK
dc.contributor.authorBeling, CDen_HK
dc.date.accessioned2012-11-26T08:47:08Z-
dc.date.available2012-11-26T08:47:08Z-
dc.date.issued1997en_HK
dc.identifier.citationJournal Of Materials Processing Technology, 1997, v. 63 n. 1-3, p. 600-603en_HK
dc.identifier.issn0924-0136en_HK
dc.identifier.urihttp://hdl.handle.net/10722/174733-
dc.description.abstractStep quenching from the solid solution temperature is a common treatment to enhance the shape memory properties in many copper-based shape memory alloys (SMAs). However, the martensite stabilisation problem is more serious in step quenched Cu-Al-Ni-Mn-Ti (CANTiM) SMAs. After step quenching, martensite in CANTiM cannot reverse transform to its parent phase. In contrast, fast quenching rates usually lead to better shape memory properties in CANTiM SMA. When the alloy is directly quenched into KOH, martensite stabilisation is still present. However, martensite stabilisation can be removed by post-quench ageing at 100°C. In rapid quenching from high temperature, a large number of defects such as vacancies are usually produced. The martensite stabilisation due to fast quenching is attributed to the pinning effect of these excessive vacancies. After post-quench ageing, the concentration of vacancies is lowered and thus the pinning effect is reduced. This paper reports the behaviour of vacancies at different cooling rates in different quenching medium, and the effect of post-quench ageing. The evolution of vacancies in the alloy is studied using positron annihilation techniques. In contrast to the martensite stabilisation due to ageing at higher temperatures, the martensite stabilisation due to fast quenching rate can be removed by a carefully chosen low temperature ageing programme.en_HK
dc.languageengen_US
dc.publisherElsevier SA. The Journal's web site is located at http://www.elsevier.com/locate/jmatprotecen_HK
dc.relation.ispartofJournal of Materials Processing Technologyen_HK
dc.subjectMartensite stabilisationen_HK
dc.subjectMartensitic transformationen_HK
dc.subjectPost-quench ageingen_HK
dc.subjectShape memory alloyen_HK
dc.titleRemoval of martensite stabilisation in CANTiM shape memory alloy by post-quench ageingen_HK
dc.typeArticleen_HK
dc.identifier.emailLing, CC: ccling@hkucc.hku.hken_HK
dc.identifier.emailFung, S: sfung@hku.hken_HK
dc.identifier.emailBeling, CD: cdbeling@hkucc.hku.hken_HK
dc.identifier.authorityLing, CC=rp00747en_HK
dc.identifier.authorityFung, S=rp00695en_HK
dc.identifier.authorityBeling, CD=rp00660en_HK
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1016/S0924-0136(96)02691-X-
dc.identifier.scopuseid_2-s2.0-0030735040en_HK
dc.identifier.hkuros21114-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0030735040&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume63en_HK
dc.identifier.issue1-3en_HK
dc.identifier.spage600en_HK
dc.identifier.epage603en_HK
dc.identifier.isiWOS:A1997WA73000102-
dc.publisher.placeSwitzerlanden_HK
dc.identifier.scopusauthoridLam, CWH=8531362100en_HK
dc.identifier.scopusauthoridChung, CY=8100842800en_HK
dc.identifier.scopusauthoridLing, CC=13310239300en_HK
dc.identifier.scopusauthoridFung, S=7201970040en_HK
dc.identifier.scopusauthoridBeling, CD=7005864180en_HK

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