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Article: Continuous strain bursts in crystalline and amorphous metals during plastic deformation by nanoindentation

TitleContinuous strain bursts in crystalline and amorphous metals during plastic deformation by nanoindentation
Authors
KeywordsEngineering
Engineering mechanics and materials physics
Issue Date2005
PublisherMaterials Research Society. The Journal's web site is located at http://www.mrs.org/publications/jmr
Citation
Journal Of Materials Research, 2005, v. 20 n. 11, p. 3072-3081 How to Cite?
AbstractUsing depth-sensing indentation with sub-nanometer displacement resolution, the plastic deformation of a range of materials, including a metallic glass, amorphous selenium, Ni3Al, pure Nb, Al, Cu, and Zn metals, and an Al-Mg alloy, has been investigated at room temperature. In amorphous selenium, even the sub-nanometer displacement resolution of the nanoindentation technique cannot reveal any strain burst during deformation at room temperature. In all other metals studied, what may appear to be smooth load-displacement curves at macroscopic scale during indentation deformation in fact turn out to consist of a continuous series of random bursts of the nanometer scale. The occurrence probability of the bursts is found to decrease at increasing burst size. In all of the crystalline metals and alloys studied, the size distribution of the strain bursts seems to follow an exponential law with a characteristic length scale. The absence of the self-organized critical behavior is likely a result of the small size of the strained volume in the nanoindentation situation, which gives rise to a constraint of a characteristic strain. In the metallic glass sample, due to the limited range of the burst sizes encountered, whether the deformation bursts follow an exponential or a power-law behavior corresponding to self-organized criticality is inconclusive. From a theoretical viewpoint based on the Shannon entropy, the exponential distribution is the most likely distribution at a given mean burst size, and this is thought to be the reason for its occurrence in different materials. © 2005 Materials Research Society.
Persistent Identifierhttp://hdl.handle.net/10722/44931
ISSN
2015 Impact Factor: 1.579
2015 SCImago Journal Rankings: 0.664
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorLi, Hen_HK
dc.contributor.authorNgan, AHWen_HK
dc.contributor.authorWang, MGen_HK
dc.date.accessioned2007-10-30T06:13:43Z-
dc.date.available2007-10-30T06:13:43Z-
dc.date.issued2005en_HK
dc.identifier.citationJournal Of Materials Research, 2005, v. 20 n. 11, p. 3072-3081en_HK
dc.identifier.issn0884-2914en_HK
dc.identifier.urihttp://hdl.handle.net/10722/44931-
dc.description.abstractUsing depth-sensing indentation with sub-nanometer displacement resolution, the plastic deformation of a range of materials, including a metallic glass, amorphous selenium, Ni3Al, pure Nb, Al, Cu, and Zn metals, and an Al-Mg alloy, has been investigated at room temperature. In amorphous selenium, even the sub-nanometer displacement resolution of the nanoindentation technique cannot reveal any strain burst during deformation at room temperature. In all other metals studied, what may appear to be smooth load-displacement curves at macroscopic scale during indentation deformation in fact turn out to consist of a continuous series of random bursts of the nanometer scale. The occurrence probability of the bursts is found to decrease at increasing burst size. In all of the crystalline metals and alloys studied, the size distribution of the strain bursts seems to follow an exponential law with a characteristic length scale. The absence of the self-organized critical behavior is likely a result of the small size of the strained volume in the nanoindentation situation, which gives rise to a constraint of a characteristic strain. In the metallic glass sample, due to the limited range of the burst sizes encountered, whether the deformation bursts follow an exponential or a power-law behavior corresponding to self-organized criticality is inconclusive. From a theoretical viewpoint based on the Shannon entropy, the exponential distribution is the most likely distribution at a given mean burst size, and this is thought to be the reason for its occurrence in different materials. © 2005 Materials Research Society.en_HK
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dc.format.extent41180 bytes-
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dc.format.mimetypetext/plain-
dc.languageengen_HK
dc.publisherMaterials Research Society. The Journal's web site is located at http://www.mrs.org/publications/jmren_HK
dc.relation.ispartofJournal of Materials Researchen_HK
dc.rightsJournal of Materials Research. Copyright © Materials Research Society.en_HK
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.subjectEngineeringen_HK
dc.subjectEngineering mechanics and materials physicsen_HK
dc.titleContinuous strain bursts in crystalline and amorphous metals during plastic deformation by nanoindentationen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0884-2914&volume=20&issue=11&spage=3072&epage=3081&date=2005&atitle=Continuous+strain+bursts+in+crystalline+and+amorphous+metals+during+plastic+deformation+by+nanoindentationen_HK
dc.identifier.emailNgan, AHW:hwngan@hkucc.hku.hken_HK
dc.identifier.authorityNgan, AHW=rp00225en_HK
dc.description.naturepublished_or_final_versionen_HK
dc.identifier.doi10.1557/JMR.2005.0379en_HK
dc.identifier.scopuseid_2-s2.0-33645457157en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-33645457157&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume20en_HK
dc.identifier.issue11en_HK
dc.identifier.spage3072en_HK
dc.identifier.epage3081en_HK
dc.identifier.isiWOS:000233095400026-
dc.publisher.placeUnited Statesen_HK
dc.identifier.scopusauthoridLi, H=26432017800en_HK
dc.identifier.scopusauthoridNgan, AHW=7006827202en_HK
dc.identifier.scopusauthoridWang, MG=8547632200en_HK

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