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Article: Microstructural evolution in NiTi alloy subjected to surface mechanical attrition treatment and mechanism

TitleMicrostructural evolution in NiTi alloy subjected to surface mechanical attrition treatment and mechanism
Authors
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
Citation
Intermetallics, 2011, v. 19 n. 8, p. 1136-1145 How to Cite?
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.
Persistent Identifierhttp://hdl.handle.net/10722/139555
ISSN
2014 Impact Factor: 2.131
2014 SCImago Journal Rankings: 1.477
ISI Accession Number ID
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.

References

 

DC FieldValueLanguage
dc.contributor.authorHu, Ten_HK
dc.contributor.authorChu, CLen_HK
dc.contributor.authorWu, SLen_HK
dc.contributor.authorXu, RZen_HK
dc.contributor.authorSun, GYen_HK
dc.contributor.authorHung, TFen_HK
dc.contributor.authorYeung, KWKen_HK
dc.contributor.authorWu, ZWen_HK
dc.contributor.authorLi, GYen_HK
dc.contributor.authorChu, PKen_HK
dc.date.accessioned2011-09-23T05:51:37Z-
dc.date.available2011-09-23T05:51:37Z-
dc.date.issued2011en_HK
dc.identifier.citationIntermetallics, 2011, v. 19 n. 8, p. 1136-1145en_HK
dc.identifier.issn0966-9795en_HK
dc.identifier.urihttp://hdl.handle.net/10722/139555-
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.en_HK
dc.languageengen_US
dc.publisherElsevier Ltd. The Journal's web site is located at http://www.elsevier.com/locate/intermeten_HK
dc.relation.ispartofIntermetallicsen_HK
dc.subjectA. Nanostructured intermetallicen_HK
dc.subjectB. Phase transformationen_HK
dc.subjectB. Plastic deformation mechanismsen_HK
dc.subjectD. Grain boundariesen_HK
dc.subjectF. Transmission electron microscopyen_HK
dc.titleMicrostructural evolution in NiTi alloy subjected to surface mechanical attrition treatment and mechanismen_HK
dc.typeArticleen_HK
dc.identifier.emailYeung, KWK:wkkyeung@hkucc.hku.hken_HK
dc.identifier.authorityYeung, KWK=rp00309en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.intermet.2011.03.020en_HK
dc.identifier.scopuseid_2-s2.0-79957612156en_HK
dc.identifier.hkuros192189en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-79957612156&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume19en_HK
dc.identifier.issue8en_HK
dc.identifier.spage1136en_HK
dc.identifier.epage1145en_HK
dc.identifier.isiWOS:000292179500008-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridHu, T=25948400300en_HK
dc.identifier.scopusauthoridChu, CL=7404345713en_HK
dc.identifier.scopusauthoridWu, SL=15125218800en_HK
dc.identifier.scopusauthoridXu, RZ=40762789500en_HK
dc.identifier.scopusauthoridSun, GY=15129334300en_HK
dc.identifier.scopusauthoridHung, TF=7103293856en_HK
dc.identifier.scopusauthoridYeung, KWK=13309584700en_HK
dc.identifier.scopusauthoridWu, ZW=16551433100en_HK
dc.identifier.scopusauthoridLi, GY=39861702100en_HK
dc.identifier.scopusauthoridChu, PK=36040705700en_HK
dc.identifier.citeulike9373083-

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