Single-crystal elastic constants of the equiatomic NiTi alloy near the martensitic transformation

Mercier, O.; Melton, K.N.; Gremaud, G.; Hägi, J.

doi:10.1063/1.327750

Cited by 228 publications

(81 citation statements)

References 23 publications

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“…The second minimum q=O near the angle 9 about 138 O is in line with the invariant plane but there is a significant discrepancy between the normals N p and NW for such value of 9. Nevertheless, there is the combination of moduli (9) Thus, the thermally formed martensite and the stress-induced one correspond to the different combinations of elastic moduli (8) and (9) Table I. Evidently, they correlate well with the above-presented experimental data.…”

Section: The Most Probable Dislocation-based Nucleation Centers For Csupporting

confidence: 76%

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Conception of New Phase Dislocation-Based Nucleation at Reconstructive Martensitic Transformations

et al. 1995

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Abstract. The role of dislocations and the dynamical mechanism controlling the structural reconstruction in the process of nucleation and wave growth of new phase unit crystals at martensitic transformations in metallic systems are discussed. It has been established that near some rectilinear dislocations with lines and Burgers's vectors typical for the original phase, there are areas where an elastically deformed state is characterized by package of particularities unambiguously corresponding to the well defuute morphological attribute set (habit, orientation relationship, macroshear) of the martensite crystal. The distinctiveness of these areas for martensite nucleation is caused by character of strains reducing the magnitude of interphase energetic barrier. The elastic model of the dislocation-based nucleation center of martensitic crystal, allowing to select the dislocations being the most probable for nucleation and to make a martensitic crystal with the morphological attribute specific collection corresponding to each a dislocation, has been proposed. Such dislocations for certain Fe-, Cu-and TiNi-based alloys are indicated. New results for titanium nickel are presented in more detail.

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Section: The Most Probable Dislocation-based Nucleation Centers For Csupporting

confidence: 76%

“…The collection (7) is taken from [8], (8) -from [9] for the temperature close to the temperature of start of B2-R transition. The collection (9) about 185'.…”

Section: The Most Probable Dislocation-based Nucleation Centers For Cmentioning

confidence: 99%

Conception of New Phase Dislocation-Based Nucleation at Reconstructive Martensitic Transformations

et al. 1995

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“…This mode of distortion in the B2 structure is well known to be very soft, as is born out in the calculation, and is frequently associated with the martensitic transformation in this class of alloys. Comparing with experimental results 29 measured at room temperature, we note that the experimental data, which are temperature dependent, indicate that c 44 is softer than our calculated result, while cЈ is stiffer than calculated ͑all our theoretical results correspond to Tϭ0 K͒. Besides temperature dependent effects, this may also be due to the effects of point defects such as vacancies and antisite defects which can sometimes be present even when the crystal is nominally at stoichiometry.…”

Section: Discussion and Summarymentioning

confidence: 56%

Structural and electronic properties of the martensitic alloys TiNi, TiPd, and TiPt

Chan

1997

Phys. Rev. B

117

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The electronic and structural properties for TiNi, TiPd, and TiPt are studied using first-principles total energy calculations. For each alloy, the structural parameters for a few structural phases are found from energy and force calculations. In each case, we found that the ground state martensitic phase (B19/B19Ј) is indeed lower in energy than the high temperature B2 phase. In all three alloys, the lowering in energy of the B19/B19Ј structure is associated with the electronic properties such as lowering of the density of states at the Fermi level at the Ti site, and the broadening of the transition-metal d bands in the B19/B19Ј phase compared with the B2 phase. ͓S0163-1829͑97͒00331-7͔

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“…For an elastically anisotropic material such as the NiTi, the residual stress in the amorphous coatings could possibly induce a texture in which grain orientations that are most compliant in the plane of the film dominate. Based on the single-crystal elastic constants of NiTi [21], this mechanism would result in a (100) fiber texture for the B 2 phase. Such a texture component is not observed in these films, however, indicating that the strain energy associated with the residual stress is not significant in defining the texture.…”

Section: Resultsmentioning

confidence: 99%

Laser annealing of amorphous NiTi shape memory alloy thin films to locally induce shape memory properties

2005

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We present the results of a crystallization study on NiTi shape memory thin films in which amorphous films are annealed by a scanning laser. This technique has the advantage that shape memory properties can be spatially distributed as required by the application. A kinetics study shows that nucleation of the crystalline phase occurs homogenously in the films. Consequently, the laser annealing process produces polycrystalline films with a random crystallographic texture.The crystallized films have a uniform microstructure across the annealed areas. The material in the crystalline regions transforms reversibly to martensite on cooling from elevated temperature and stress measurements show that a significant recovery stress is achieved in the films upon transformation.

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Single-crystal elastic constants of the equiatomic NiTi alloy near the martensitic transformation

Cited by 228 publications

References 23 publications

Conception of New Phase Dislocation-Based Nucleation at Reconstructive Martensitic Transformations

Conception of New Phase Dislocation-Based Nucleation at Reconstructive Martensitic Transformations

Structural and electronic properties of the martensitic alloys TiNi, TiPd, and TiPt

Laser annealing of amorphous NiTi shape memory alloy thin films to locally induce shape memory properties

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