Calorimetric Study of a Diffusionless Phase Transition in TiNi

Dautovich, D.P.; Melkvi, Z.; Purdy, G.R.; Stager, C. V.

doi:10.1063/1.1708847

Cited by 53 publications

(10 citation statements)

References 3 publications

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“…The enthalpies of transformation of sample 1 and sample 2 are 1500 and 1450 J mol -1 , respectively. These values are within the scatter of the values published in the literature (1)(2)(3)(4). If the enthalpy of different generations is divided by the total enthalpy the relative fractions of the different generations are nearly given.…”

Section: Resultssupporting

confidence: 66%

Cp Measurement on the Shape Memory Alloy Ni-52Ti

Jiang¹,

Luck²,

Smith³

1989

ESOMAT 1989 - Ist European Symposium on Martensitic Transformations in Science and Technology

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Section: Resultssupporting

confidence: 66%

Cp Measurement on the Shape Memory Alloy Ni-52Ti

Jiang¹,

Luck²,

Smith³

1989

ESOMAT 1989 - Ist European Symposium on Martensitic Transformations in Science and Technology

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“…[1][2][3][4][5][6][7][8][9]26,[28][29][30][31][32][33] The reported experimental data differ significantly from each other. It often happens that the same composition alloys have quite different M s temperatures and enthalpy values.…”

Section: Experimental Information and Parameter Evaluationmentioning

confidence: 52%

Thermodynamic study of the low-temperature phase B19′ and the martensitic transformation in near-equiatomic Ti-Ni shape memory alloys

Tang

1997

Metall Mater Trans A

176

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Experimental information on the transformation temperatures and the thermodynamic properties of the near-equiatomic TiNi alloys is analyzed. Special attention is paid to the estimation of T 0 temperature from experimental M s and A f temperatures. The properties of the TiNi low-temperature phase (B19') are evaluated from selected experimental data by using a two-sublattice model. The Ti-Ni phase diagram including the B19' phase is then calculated. It reveals that the equiatomic TiNi parent phase (B2) remains stable from high temperatures until 370 K, and then the B19' phase becomes thermodynamically stable as a linear compound under 370 K. Thermodynamic quantities such as the T 0 temperature and transformation enthalpy are also calculated and compared with experimental data. Further, the M s temperature is predicted and compared with data from different sources.

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“…[8,9,[38][39][40][41] Therefore, the anticipated loss of Ni following laser processing was expected to increase the phase transformation temperatures; as was found by Meier et al, studying selective laser melting of NiTi. [42] This hypothesis agrees with results from the differential scanning calorimetry (DSC) analysis presented in Figure 2.…”

Section: Augmentation Of Transformation Temperaturesmentioning

confidence: 98%

“…There have been some inconsistencies in prior studies that investigated the effects of composition on transformation temperatures. [38][39][40] However, investigators have consistently reported that when the composition of solutionized NiTi alloys was near or below equiatomic, the maximum M s temperature is approximately 338 K (65 8C). [8,9] When Ni composition is below 49 at.%, transformation temperatures become independent of composition due to Ti saturation.…”

Section: Verification Of the Vaporization Mechanismmentioning

confidence: 99%

Multiple Memory Shape Memory Alloys

2013

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Until now, shape memory alloys (SMAs) have been largely limited to “remembering” a single memory. In other words, monolithic components only possess a single set of functional properties. The current work describes how theorized change to local chemical composition induced through laser processing enables controlled augmentation of transformation temperatures. Proof of concept was demonstrated by locally embedding multiple shape memories into a monolithic NiTi component. This novel technique overcomes traditional fabrication challenges and promises to enhance SMA functionality and facilitate novel applications through producing a new class of smart materials; namely multiple memory materials (MMMs).

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Calorimetric Study of a Diffusionless Phase Transition in TiNi

Cited by 53 publications

References 3 publications

Cp Measurement on the Shape Memory Alloy Ni-52Ti

Cp Measurement on the Shape Memory Alloy Ni-52Ti

Thermodynamic study of the low-temperature phase B19′ and the martensitic transformation in near-equiatomic Ti-Ni shape memory alloys

Multiple Memory Shape Memory Alloys

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