Thermally- and stress-induced thermoelastic martensitic transformations in the reference frame of equilibrium thermodynamics

Wollants, Patrick; Roos, Jozef; Delaey, L.

doi:10.1016/0079-6425(93)90005-6

Cited by 270 publications

(145 citation statements)

References 36 publications

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“…For example, we may re-examine the size effect on transformation hysteresis in light of the above discussion, because hysteresis is directly related to transformation obstacles [21,66,67]. During a thermoelastic martensitic transformation the moving interface has to perform an amount of frictional work related to the number and nature of the obstacles it meets [21,67].…”

Section: Size Effect In Hysteresismentioning

confidence: 99%

“…In line with these results, microcompression studies on Cu-Al-Ni single crystalline pillars with diameters of ~1 µm show a much larger superelastic hysteresis than their bulk counterparts [17][18][19][20]; smaller samples dissipate more energy per unit volume than larger samples. The energy dissipation in SMAs, manifested by the hysteresis, is related to the movement of the austenite/martensite interface where energy is dissipated in the form of frictional work spent on overcoming resistance to interface motion [21,22].…”

Section: Introductionmentioning

confidence: 99%

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Transition from many domain to single domain martensite morphology in small-scale shape memory alloys

Ueland

Schuh

2013

Acta Materialia

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Section: Size Effect In Hysteresismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Transition from many domain to single domain martensite morphology in small-scale shape memory alloys

Ueland

Schuh

2013

Acta Materialia

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“…(18) in the previous example), correspond to true equilibrium states, and not to states where the equilibrium would only be established along the interfaces between the martensitic domains and the austenite, as suggested in Ref. 32. Also, further growth of the martensite is continuous and do not necessitate any finite increase of undercooling.…”

Section: Model Of Olson and Cohenmentioning

confidence: 96%

The role of phase compatibility in martensite

Salman

Finel

Delville

et al. 2012

Journal of Applied Physics

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Shape memory alloys inherit their macroscopic properties from their mesoscale microstructure originated from the martensitic phase transformation. In a cubic to orthorhombic transition, a single variant of martensite can have a compatible (exact) interface with the austenite for some special lattice parameters in contrast to conventional austenite/twinned martensite interface with a transition layer. Experimentally, the phase compatibility results in a dramatic drop in thermal hysteresis and gives rise to very stable functional properties over cycling. Here, we investigate the microstructures observed in Ti50Ni50−xPdx alloys that undergo a cubic to orthorhombic martensitic transformation using a three-dimensional phase field approach. We will show that the simulation results are in very good agreement with transmission electron microscopy observations. However, the understanding of the drop in thermal hysteresis requires the coupling of phase transformation with plastic activity. We will discuss this point within the framework of thermoelasticity, which is a generic feature of the martensitic transformation.

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“…Whilst details of these transformations, such as hysteresis, require consideration of further factors [5], it is possible in principle to calculate the phase equilibria from data of the type contained in table 1. The only problem associated with such analyses is the formalism employed for the effect of stress on the thermodynamics of the transformation.…”

Section: Thermodynamic Formalismmentioning

confidence: 99%

The Thermomechanical Behaviour of a Metastable Cu-Al-Ni Single Crystal Alloy

Friend

Hamilton

1995

J. Phys. IV France

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This paper presents the results from an experimental and theoretical analysis of the thermomechanical behaviour of a metastable P-phase single crystal alloy of composition Cu -28.3at% A1 -3.8at% Ni. The stress-strain behaviour of this single crystal material was investigated experimentally by tensile testing and this data was used to characterise the stress1 temperature martensite phase equilibria. The same alloy was also the subject of microcalorimetric measurements which enabled some of the enthalpies and entropies of transformation to be directly determined. This thermodynamic data was used to calculate the stressltemperature phase equilibria of the alloy. It is shown that the calculated equilibria agree well with those measured experimentally. It is also shown that such thermodynamic evaluations allow a direct interrogation of free-energylstressltemperature space which provides a fundamental explanation for the change in stress-induced martensite type as the temperature of the alloy is increased. It is shown that the latter is due primarily to the difference in the shear strains associated with the 0 7 ' and &-P' martensitic transformations, with a smaller effect resulting from the entropy difference between the y' and fi' phases.

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Thermally- and stress-induced thermoelastic martensitic transformations in the reference frame of equilibrium thermodynamics

Cited by 270 publications

References 36 publications

Transition from many domain to single domain martensite morphology in small-scale shape memory alloys

Transition from many domain to single domain martensite morphology in small-scale shape memory alloys

The role of phase compatibility in martensite

The Thermomechanical Behaviour of a Metastable Cu-Al-Ni Single Crystal Alloy

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