Martensitic transformations in gold-titanium, palladium-titanium and platinum-titanium alloys near the equiatomic composition

Donkersloot, H. C.; Vucht, J.H.N. van

doi:10.1016/0022-5088(70)90092-5

Cited by 265 publications

(179 citation statements)

References 5 publications

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“…[3][4][5]21,22] The data for the current alloys lie within the bounds of those values reported for stoichiometric Ni 50Àx Pd x Ti 50 by Boriskina and Kenina [3] and Lindquist and Wayman. [5] This is expected, since, like binary NiTi, [23,24] NiTiPd transformation temperatures are extremely sensitive to (Ni, Pd):Ti ratio on the Ni-rich side of stoichiometry, but are much less sensitive between the Ti-rich and stoichiometric compositions.…”

Section: B Stress-free Transformation Temperaturessupporting

confidence: 77%

“…[2] Originally investigated in 1980 by Boriskina and Kenina, (Ni,Pd)Ti was identified as a stoichiometric pseudobinary system between NiTi and TiPd. [3] In the ternary (Ni,Pd)Ti system, the high (>773 K (500°C)) transformation temperature of TiPd [4] was shown to decrease linearly with decreasing Pd content to a minimum value near 10 at. pct Pd.…”

Section: Introductionmentioning

confidence: 99%

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Characterization of Ternary NiTiPd High-Temperature Shape-Memory Alloys under Load-Biased Thermal Cycling

Bigelow

Padula

Garg

et al. 2010

Metall Mater Trans A

129

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While NiTiPd alloys have been extensively studied for proposed use in high-temperature shapememory applications, little is known about the shape-memory response of these materials under stress. Consequently, the isobaric thermal cyclic responses of five (Ni,Pd) 49.5 Ti 50.5 alloys with constant stoichiometry and Pd contents ranging from 15 to 46 at. pct were investigated. From these tests, transformation temperatures, transformation strain (which is proportional to work output), and unrecovered strain per cycle (a measure of dimensional instability) were determined as a function of stress for each alloy. It was found that increasing the Pd content over this range resulted in a linear increase in transformation temperature, as expected. At a given stress level, work output decreased while the amount of unrecovered strain produced during each load-biased thermal cycle increased with increasing Pd content, during the initial thermal cycles. However, continued thermal cycling at constant stress resulted in a saturation of the work output and nearly eliminated further unrecovered strain under certain conditions, resulting in stable behavior amenable to many actuator applications.

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Section: B Stress-free Transformation Temperaturessupporting

confidence: 77%

Section: Introductionmentioning

confidence: 99%

Characterization of Ternary NiTiPd High-Temperature Shape-Memory Alloys under Load-Biased Thermal Cycling

Bigelow

Padula

Garg

et al. 2010

Metall Mater Trans A

129

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“…A simple estimate of the transition temperature is given by ∆E = kT c which suggest T c of 1050K (PdTi) and 1755K (PtTi). These rough values are significantly larger than the experimental data for the hysteretical transition region [13,35,36] (approximately 800K and 1400K respectively), but show the correct material trend. For neither system has a B19 ′ phase yet been observed experimentally.…”

Section: Alloymentioning

confidence: 54%

First-principles study of the structural energetics of PdTi and PtTi

2003

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The structural energetics of PdTi and PtTi have been studied using first-principles densityfunctional theory with pseudopotentials and a plane-wave basis. We predict that in both materials, the experimentally reported orthorhombic B19 phase will undergo a low-temperature phase transition to a monoclinic B19 ′ ground state. Within a soft-mode framework, we relate the B19 structure to the cubic B2 structure, observed at high temperature, and the B19 ′ structure to B19 via phonon modes strongly coupled to strain. In contrast to NiTi, the B19 structure is extremely close to hcp. We draw on the analogy to the bcc-hcp transition to suggest likely transition mechanisms in the present case.

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“…The lattice parameters and the atomic positions as determined by force calculations are listed in Table III for TiPd and TiPt. Although the lattice parameters of TiPd and TiPt in the B19 structure has been reported, 25 we are not aware of experimental determination of the atomic positions. Previous calculations on the electronic structure of the B19 phase of these alloys seemed to have adopted the coordinates of CdAu, which need not be appropiate for TiPd and TiPt.…”

Section: Tipd and Tiptmentioning

confidence: 95%

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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Martensitic transformations in gold-titanium, palladium-titanium and platinum-titanium alloys near the equiatomic composition

Cited by 265 publications

References 5 publications

Characterization of Ternary NiTiPd High-Temperature Shape-Memory Alloys under Load-Biased Thermal Cycling

Characterization of Ternary NiTiPd High-Temperature Shape-Memory Alloys under Load-Biased Thermal Cycling

First-principles study of the structural energetics of PdTi and PtTi

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

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