File Download

There are no files associated with this item.

  Links for fulltext
     (May Require Subscription)
Supplementary

Article: Time-dependent characteristics of incipient plasticity in nanoindentation of a Ni3Al single crystal

TitleTime-dependent characteristics of incipient plasticity in nanoindentation of a Ni3Al single crystal
Authors
KeywordsMechanical Properties
Nanoindentation
Single Crystal
Issue Date2002
PublisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/actamat
Citation
Acta Materialia, 2002, v. 50 n. 6, p. 1599-1611 How to Cite?
AbstractDepth-sensing nanoindentation was used to trace the transition from elasticity to plasticity in single crystal Ni3Al. We found, as others have reported, that the incipient plasticity occurs spontaneously on increasing the load over a narrow load range. However, when the load is held at a value smaller than the spontaneous excursion value, excursion will also occur, albeit after a certain holding time. The holding time is found to be longer at lower holding loads. The magnitude of the displacement excursion is also found to increase with the holding load. After the excursion, all the tests showed similar elastoplastic deformation behavior in the load-displacement plot. A passive layer following electropolishing was found to be responsible for the pre-excursion plasticity observed in some samples. This passive layer, however, has no significant effect on the critical load for incipient plasticity. A model based on the homogeneous nucleation of a dislocation loop was proposed to explain the observations. The time-delay effect of the pop-in is thought to be due to the slow growth of an initially stable dislocation loop at the most highly stressed point under the indenter to an unstable loop by absorption of vacancies from the matrix. © 2002 Acta Materialia Inc. Published by Elsevier Science Ltd. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/156644
ISSN
2015 Impact Factor: 5.058
2015 SCImago Journal Rankings: 3.683
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorChiu, YLen_US
dc.contributor.authorNgan, AHWen_US
dc.date.accessioned2012-08-08T08:43:21Z-
dc.date.available2012-08-08T08:43:21Z-
dc.date.issued2002en_US
dc.identifier.citationActa Materialia, 2002, v. 50 n. 6, p. 1599-1611en_US
dc.identifier.issn1359-6454en_US
dc.identifier.urihttp://hdl.handle.net/10722/156644-
dc.description.abstractDepth-sensing nanoindentation was used to trace the transition from elasticity to plasticity in single crystal Ni3Al. We found, as others have reported, that the incipient plasticity occurs spontaneously on increasing the load over a narrow load range. However, when the load is held at a value smaller than the spontaneous excursion value, excursion will also occur, albeit after a certain holding time. The holding time is found to be longer at lower holding loads. The magnitude of the displacement excursion is also found to increase with the holding load. After the excursion, all the tests showed similar elastoplastic deformation behavior in the load-displacement plot. A passive layer following electropolishing was found to be responsible for the pre-excursion plasticity observed in some samples. This passive layer, however, has no significant effect on the critical load for incipient plasticity. A model based on the homogeneous nucleation of a dislocation loop was proposed to explain the observations. The time-delay effect of the pop-in is thought to be due to the slow growth of an initially stable dislocation loop at the most highly stressed point under the indenter to an unstable loop by absorption of vacancies from the matrix. © 2002 Acta Materialia Inc. Published by Elsevier Science Ltd. All rights reserved.en_US
dc.languageengen_US
dc.publisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/actamaten_US
dc.relation.ispartofActa Materialiaen_US
dc.subjectMechanical Propertiesen_US
dc.subjectNanoindentationen_US
dc.subjectSingle Crystalen_US
dc.titleTime-dependent characteristics of incipient plasticity in nanoindentation of a Ni3Al single crystalen_US
dc.typeArticleen_US
dc.identifier.emailNgan, AHW: hwngan@hkucc.hku.hken_US
dc.identifier.authorityNgan, AHW=rp00225en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1016/S1359-6454(02)00025-3en_US
dc.identifier.scopuseid_2-s2.0-0037006911en_US
dc.identifier.hkuros67028-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0037006911&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume50en_US
dc.identifier.issue6en_US
dc.identifier.spage1599en_US
dc.identifier.epage1611en_US
dc.identifier.isiWOS:000174972400030-
dc.publisher.placeUnited Kingdomen_US
dc.identifier.scopusauthoridChiu, YL=7202775086en_US
dc.identifier.scopusauthoridNgan, AHW=7006827202en_US
dc.identifier.citeulike572393-

Export via OAI-PMH Interface in XML Formats


OR


Export to Other Non-XML Formats