Details
| Original language | English |
|---|---|
| Pages (from-to) | 422-430 |
| Number of pages | 9 |
| Journal | Materials Science and Engineering A |
| Volume | 558 |
| Publication status | Published - 14 Aug 2012 |
| Externally published | Yes |
Abstract
NiTi alloys in the martensitic phase deform by detwinning of the martensite variants succeeded by deformation twinning of the single crystal of martensite. One of the deformation twinning modes of the martensite is denoted as (20. 1-)[. 1-0. 2-]. In this work, we establish how twinning on the (20. 1-) planes develops via the combination of homogeneous shear and shuffle and establish its energy barrier via atomistic simulations. We calculate the slip barrier in addition to the twin barrier ruling out the potential for plastic flow via slip in the (20. 1-) plane. The (20. 1-)[. 1-0. 2-] mode succeeds the (001) and (100) compound twinning modes which have lower energy barriers. It plays a significant role in allowing deformation to higher strains in the martensitic phase. Therefore, the insight into the (20. 1-)[. 1-0. 2-] twinning mode is important in extending the shape memory strains in NiTi alloys and towards better understanding of shape memory alloys in general.
Keywords
- Ab-initio, Martensite (201), NiTi shape memory, Twins
ASJC Scopus subject areas
- Materials Science(all)
- General Materials Science
- Physics and Astronomy(all)
- Condensed Matter Physics
- Engineering(all)
- Mechanics of Materials
- Engineering(all)
- Mechanical Engineering
Cite this
- Standard
- Harvard
- Apa
- Vancouver
- BibTeX
- RIS
In: Materials Science and Engineering A, Vol. 558, 14.08.2012, p. 422-430.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Higher order twin modes in martensitic NiTi
T2 - The (201̄) case
AU - Ezaz, T.
AU - Sehitoglu, H.
AU - Abuzaid, W.
AU - Maier, H. J.
N1 - Funding information: The work was supported by the NSF Grant CMMI-09-26813 and partly by DMR-08-03270 . The authors acknowledge Dr. S. Dilibal with assistance in the experiments.
PY - 2012/8/14
Y1 - 2012/8/14
N2 - NiTi alloys in the martensitic phase deform by detwinning of the martensite variants succeeded by deformation twinning of the single crystal of martensite. One of the deformation twinning modes of the martensite is denoted as (20. 1-)[. 1-0. 2-]. In this work, we establish how twinning on the (20. 1-) planes develops via the combination of homogeneous shear and shuffle and establish its energy barrier via atomistic simulations. We calculate the slip barrier in addition to the twin barrier ruling out the potential for plastic flow via slip in the (20. 1-) plane. The (20. 1-)[. 1-0. 2-] mode succeeds the (001) and (100) compound twinning modes which have lower energy barriers. It plays a significant role in allowing deformation to higher strains in the martensitic phase. Therefore, the insight into the (20. 1-)[. 1-0. 2-] twinning mode is important in extending the shape memory strains in NiTi alloys and towards better understanding of shape memory alloys in general.
AB - NiTi alloys in the martensitic phase deform by detwinning of the martensite variants succeeded by deformation twinning of the single crystal of martensite. One of the deformation twinning modes of the martensite is denoted as (20. 1-)[. 1-0. 2-]. In this work, we establish how twinning on the (20. 1-) planes develops via the combination of homogeneous shear and shuffle and establish its energy barrier via atomistic simulations. We calculate the slip barrier in addition to the twin barrier ruling out the potential for plastic flow via slip in the (20. 1-) plane. The (20. 1-)[. 1-0. 2-] mode succeeds the (001) and (100) compound twinning modes which have lower energy barriers. It plays a significant role in allowing deformation to higher strains in the martensitic phase. Therefore, the insight into the (20. 1-)[. 1-0. 2-] twinning mode is important in extending the shape memory strains in NiTi alloys and towards better understanding of shape memory alloys in general.
KW - Ab-initio
KW - Martensite (201)
KW - NiTi shape memory
KW - Twins
UR - http://www.scopus.com/inward/record.url?scp=84866291050&partnerID=8YFLogxK
U2 - 10.1016/j.msea.2012.08.022
DO - 10.1016/j.msea.2012.08.022
M3 - Article
AN - SCOPUS:84866291050
VL - 558
SP - 422
EP - 430
JO - Materials Science and Engineering A
JF - Materials Science and Engineering A
SN - 0921-5093
ER -