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Article: Microstructural evolution in NiTi alloy subjected to surface mechanical attrition treatment and mechanism
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TitleMicrostructural evolution in NiTi alloy subjected to surface mechanical attrition treatment and mechanism
 
AuthorsHu, T4
Chu, CL3
Wu, SL4 5
Xu, RZ4
Sun, GY2
Hung, TF4
Yeung, KWK1
Wu, ZW4
Li, GY2
Chu, PK4
 
KeywordsA. Nanostructured intermetallic
B. Phase transformation
B. Plastic deformation mechanisms
D. Grain boundaries
F. Transmission electron microscopy
 
Issue Date2011
 
PublisherElsevier Ltd. The Journal's web site is located at http://www.elsevier.com/locate/intermet
 
CitationIntermetallics, 2011, v. 19 n. 8, p. 1136-1145 [How to Cite?]
DOI: http://dx.doi.org/10.1016/j.intermet.2011.03.020
 
AbstractBoth nanocrystalline and amorphous phases are observed from the near surface of nickel titanium shape memory alloy (NiTi SMA) with the B2 austenite phase after surface mechanical attrition treatment (SMAT). The microstructure and phase changes are systematically studied by cross-sectional and plane-view transmission electron microscopy. The strain induces grain refinement and it is accompanied by increased strain in the surface layer triggering the onset of highly dense dislocations and dislocation tangles (DTs), formation of the martensite plate via stress-induced martensite (SIM) transformation (B2 to B19′), and dislocation lines (DLs) as well as dense dislocation walls (DDWs) inside the martensite plate leading to the subdivision of the martensite plate. In addition, reverse martensite transformation (B19′ to B2) and amorphization take place concurrently in the surface region, and successive subdivision and amorphization finally result in the formation of well separated nanocrystalline and amorphous phases in the near surface. The average grain size of the nanocrystallites is about 20 nm. Owing to the almost complete reverse martensite transformation as well as thermal stability, the strain-induced nanocrystalline structure has the B2 austenite phase in the surface layer and no transformation occurs. © 2011 Elsevier Ltd. All rights reserved.
 
ISSN0966-9795
2012 Impact Factor: 1.857
2012 SCImago Journal Rankings: 1.194
 
DOIhttp://dx.doi.org/10.1016/j.intermet.2011.03.020
 
ISI Accession Number IDWOS:000292179500008
Funding AgencyGrant Number
City University of Hong Kong7008009
State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body31015007
Funding Information:

This work was financially supported by City University of Hong Kong Strategic Research Grant (SRG) No. 7008009 and the Science Fund of State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body No. 31015007. The authors acknowledge Dr. W.L. Liu and Mr. X.B. Ma at Shanghai Institute of Micro-system and Information Technolgy, Chinese Academy of Science for their assistance in the TEM thin foil preparation. T. Hu is grateful to Dr. C.S. Wen at the Hong Kong Polytechnic University for SMAT experiments and Prof. J. Lu at City University of Hong Kong for valuable discussions.

 
ReferencesReferences in Scopus
 
DC FieldValue
dc.contributor.authorHu, T
 
dc.contributor.authorChu, CL
 
dc.contributor.authorWu, SL
 
dc.contributor.authorXu, RZ
 
dc.contributor.authorSun, GY
 
dc.contributor.authorHung, TF
 
dc.contributor.authorYeung, KWK
 
dc.contributor.authorWu, ZW
 
dc.contributor.authorLi, GY
 
dc.contributor.authorChu, PK
 
dc.date.accessioned2011-09-23T05:51:37Z
 
dc.date.available2011-09-23T05:51:37Z
 
dc.date.issued2011
 
dc.description.abstractBoth nanocrystalline and amorphous phases are observed from the near surface of nickel titanium shape memory alloy (NiTi SMA) with the B2 austenite phase after surface mechanical attrition treatment (SMAT). The microstructure and phase changes are systematically studied by cross-sectional and plane-view transmission electron microscopy. The strain induces grain refinement and it is accompanied by increased strain in the surface layer triggering the onset of highly dense dislocations and dislocation tangles (DTs), formation of the martensite plate via stress-induced martensite (SIM) transformation (B2 to B19′), and dislocation lines (DLs) as well as dense dislocation walls (DDWs) inside the martensite plate leading to the subdivision of the martensite plate. In addition, reverse martensite transformation (B19′ to B2) and amorphization take place concurrently in the surface region, and successive subdivision and amorphization finally result in the formation of well separated nanocrystalline and amorphous phases in the near surface. The average grain size of the nanocrystallites is about 20 nm. Owing to the almost complete reverse martensite transformation as well as thermal stability, the strain-induced nanocrystalline structure has the B2 austenite phase in the surface layer and no transformation occurs. © 2011 Elsevier Ltd. All rights reserved.
 
dc.description.natureLink_to_subscribed_fulltext
 
dc.identifier.citationIntermetallics, 2011, v. 19 n. 8, p. 1136-1145 [How to Cite?]
DOI: http://dx.doi.org/10.1016/j.intermet.2011.03.020
 
dc.identifier.citeulike9373083
 
dc.identifier.doihttp://dx.doi.org/10.1016/j.intermet.2011.03.020
 
dc.identifier.epage1145
 
dc.identifier.hkuros192189
 
dc.identifier.isiWOS:000292179500008
Funding AgencyGrant Number
City University of Hong Kong7008009
State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body31015007
Funding Information:

This work was financially supported by City University of Hong Kong Strategic Research Grant (SRG) No. 7008009 and the Science Fund of State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body No. 31015007. The authors acknowledge Dr. W.L. Liu and Mr. X.B. Ma at Shanghai Institute of Micro-system and Information Technolgy, Chinese Academy of Science for their assistance in the TEM thin foil preparation. T. Hu is grateful to Dr. C.S. Wen at the Hong Kong Polytechnic University for SMAT experiments and Prof. J. Lu at City University of Hong Kong for valuable discussions.

 
dc.identifier.issn0966-9795
2012 Impact Factor: 1.857
2012 SCImago Journal Rankings: 1.194
 
dc.identifier.issue8
 
dc.identifier.scopuseid_2-s2.0-79957612156
 
dc.identifier.spage1136
 
dc.identifier.urihttp://hdl.handle.net/10722/139555
 
dc.identifier.volume19
 
dc.languageeng
 
dc.publisherElsevier Ltd. The Journal's web site is located at http://www.elsevier.com/locate/intermet
 
dc.publisher.placeUnited Kingdom
 
dc.relation.ispartofIntermetallics
 
dc.relation.referencesReferences in Scopus
 
dc.subjectA. Nanostructured intermetallic
 
dc.subjectB. Phase transformation
 
dc.subjectB. Plastic deformation mechanisms
 
dc.subjectD. Grain boundaries
 
dc.subjectF. Transmission electron microscopy
 
dc.titleMicrostructural evolution in NiTi alloy subjected to surface mechanical attrition treatment and mechanism
 
dc.typeArticle
 
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<contributor.author>Yeung, KWK</contributor.author>
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Author Affiliations
  1. The University of Hong Kong
  2. Hunan University
  3. Southeast University
  4. City University of Hong Kong
  5. Hubei University