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Article: Continuous strain bursts in crystalline and amorphous metals during plastic deformation by nanoindentation
Title | Continuous strain bursts in crystalline and amorphous metals during plastic deformation by nanoindentation |
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Authors | |
Keywords | Engineering Engineering mechanics and materials physics |
Issue Date | 2005 |
Publisher | Materials 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? |
Abstract | Using 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 Identifier | http://hdl.handle.net/10722/44931 |
ISSN | 2023 Impact Factor: 2.7 2023 SCImago Journal Rankings: 0.569 |
ISI Accession Number ID | |
References |
DC Field | Value | Language |
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dc.contributor.author | Li, H | en_HK |
dc.contributor.author | Ngan, AHW | en_HK |
dc.contributor.author | Wang, MG | en_HK |
dc.date.accessioned | 2007-10-30T06:13:43Z | - |
dc.date.available | 2007-10-30T06:13:43Z | - |
dc.date.issued | 2005 | en_HK |
dc.identifier.citation | Journal Of Materials Research, 2005, v. 20 n. 11, p. 3072-3081 | en_HK |
dc.identifier.issn | 0884-2914 | en_HK |
dc.identifier.uri | http://hdl.handle.net/10722/44931 | - |
dc.description.abstract | Using 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 |
dc.format.extent | 831521 bytes | - |
dc.format.extent | 41180 bytes | - |
dc.format.extent | 310 bytes | - |
dc.format.mimetype | application/pdf | - |
dc.format.mimetype | application/pdf | - |
dc.format.mimetype | text/plain | - |
dc.language | eng | en_HK |
dc.publisher | Materials Research Society. The Journal's web site is located at http://www.mrs.org/publications/jmr | en_HK |
dc.relation.ispartof | Journal of Materials Research | en_HK |
dc.rights | Journal of Materials Research. Copyright © Materials Research Society. | en_HK |
dc.subject | Engineering | en_HK |
dc.subject | Engineering mechanics and materials physics | en_HK |
dc.title | Continuous strain bursts in crystalline and amorphous metals during plastic deformation by nanoindentation | en_HK |
dc.type | Article | en_HK |
dc.identifier.openurl | http://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+nanoindentation | en_HK |
dc.identifier.email | Ngan, AHW:hwngan@hkucc.hku.hk | en_HK |
dc.identifier.authority | Ngan, AHW=rp00225 | en_HK |
dc.description.nature | published_or_final_version | en_HK |
dc.identifier.doi | 10.1557/JMR.2005.0379 | en_HK |
dc.identifier.scopus | eid_2-s2.0-33645457157 | en_HK |
dc.relation.references | http://www.scopus.com/mlt/select.url?eid=2-s2.0-33645457157&selection=ref&src=s&origin=recordpage | en_HK |
dc.identifier.volume | 20 | en_HK |
dc.identifier.issue | 11 | en_HK |
dc.identifier.spage | 3072 | en_HK |
dc.identifier.epage | 3081 | en_HK |
dc.identifier.isi | WOS:000233095400026 | - |
dc.publisher.place | United States | en_HK |
dc.identifier.scopusauthorid | Li, H=26432017800 | en_HK |
dc.identifier.scopusauthorid | Ngan, AHW=7006827202 | en_HK |
dc.identifier.scopusauthorid | Wang, MG=8547632200 | en_HK |
dc.identifier.issnl | 0884-1616 | - |