Article: Microstructural evolution in NiTi alloy subjected to surface mechanical attrition treatment and mechanism
| Title | Microstructural evolution in NiTi alloy subjected to surface mechanical attrition treatment and mechanism | ||||||
|---|---|---|---|---|---|---|---|
| Authors | Hu, T4 Chu, CL3 Wu, SL4 5 Xu, RZ4 Sun, GY1 Hung, TF4 Yeung, KWK2 Wu, ZW4 Li, GY1 Chu, PK4 | ||||||
| Keywords | A. Nanostructured intermetallic B. Phase transformation B. Plastic deformation mechanisms D. Grain boundaries F. Transmission electron microscopy | ||||||
| Issue Date | 2011 | ||||||
| Publisher | Elsevier 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?] DOI: http://dx.doi.org/10.1016/j.intermet.2011.03.020 | ||||||
| Abstract | Both 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. | ||||||
| ISSN | 0966-9795 2011 Impact Factor: 1.649 2011 SCImago Journal Rankings: 0.107 | ||||||
| DOI | http://dx.doi.org/10.1016/j.intermet.2011.03.020 | ||||||
| ISI Accession Number ID | WOS:000292179500008
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 | References in Scopus |
| dc.contributor.author | Hu, T | ||||||
|---|---|---|---|---|---|---|---|
| dc.contributor.author | Chu, CL | ||||||
| dc.contributor.author | Wu, SL | ||||||
| dc.contributor.author | Xu, RZ | ||||||
| dc.contributor.author | Sun, GY | ||||||
| dc.contributor.author | Hung, TF | ||||||
| dc.contributor.author | Yeung, KWK | ||||||
| dc.contributor.author | Wu, ZW | ||||||
| dc.contributor.author | Li, GY | ||||||
| dc.contributor.author | Chu, PK | ||||||
| dc.date.accessioned | 2011-09-23T05:51:37Z | ||||||
| dc.date.available | 2011-09-23T05:51:37Z | ||||||
| dc.date.issued | 2011 | ||||||
| dc.description.abstract | Both 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.nature | Link_to_subscribed_fulltext | ||||||
| dc.identifier.citation | Intermetallics, 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.citeulike | 9373083 | ||||||
| dc.identifier.doi | http://dx.doi.org/10.1016/j.intermet.2011.03.020 | ||||||
| dc.identifier.epage | 1145 | ||||||
| dc.identifier.hkuros | 192189 | ||||||
| dc.identifier.isi | WOS:000292179500008
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.issn | 0966-9795 2011 Impact Factor: 1.649 2011 SCImago Journal Rankings: 0.107 | ||||||
| dc.identifier.issue | 8 | ||||||
| dc.identifier.scopus | eid_2-s2.0-79957612156 | ||||||
| dc.identifier.spage | 1136 | ||||||
| dc.identifier.uri | http://hdl.handle.net/10722/139555 | ||||||
| dc.identifier.volume | 19 | ||||||
| dc.language | eng | ||||||
| dc.publisher | Elsevier Ltd. The Journal's web site is located at http://www.elsevier.com/locate/intermet | ||||||
| dc.publisher.place | United Kingdom | ||||||
| dc.relation.ispartof | Intermetallics | ||||||
| dc.relation.references | References in Scopus | ||||||
| dc.subject | A. Nanostructured intermetallic | ||||||
| dc.subject | B. Phase transformation | ||||||
| dc.subject | B. Plastic deformation mechanisms | ||||||
| dc.subject | D. Grain boundaries | ||||||
| dc.subject | F. Transmission electron microscopy | ||||||
| dc.title | Microstructural evolution in NiTi alloy subjected to surface mechanical attrition treatment and mechanism | ||||||
| dc.type | Article |
Author Affiliations
- Hunan University
- The University of Hong Kong
- Southeast University
- City University of Hong Kong
- Hubei University