期刊
PHILOSOPHICAL MAGAZINE LETTERS
卷 97, 期 6, 页码 217-228出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/09500839.2017.1316019
关键词
Deformation twinning; slip; bands; Ni-Ti alloys; EBSD; shape memory alloys; plastic; deformation; dislocations; twinning; {110}. 0 0 1. slip; {114} twinning; B2 austenite
类别
资金
- Nyquist Chair funds
- National Science Foundation, DMREF grant [1437106]
- Div Of Civil, Mechanical, & Manufact Inn
- Directorate For Engineering [1437106] Funding Source: National Science Foundation
The work addresses two main questions that have baffled the shape memory research community. Firstly, the superb ductility of B2NiTi cannot be solely attributed to slip on {0 1 1} planes, because there are not a sufficient number of independent slip systems under arbitrary deformations. We show unequivocally, upon diffraction measurements and local strain field traces, that deformation twinning on {1 1 4} planes that can provide additional systems to accommodate plastic flow is activated. Secondly, the slip direction on the {0 1 1} planes has not been established in NiTi with certainty. It is proved precisely to be in. 0 0 1. direction based on crystallographic shear analysis producing the specific strain tensor components (measured at mesoscale with digital image correlation, DIC). Based on the singlecrystal experiments, the CRSSs (critical resolved shear stress) are established as 250 and 330 MPa for slip and twinning, respectively. The results have implications in devising correct crystal plasticity formulations for shape memory alloys.
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