Martensitic transitions, fluctuation processes and the effect of boundary conditions in pair-force model crystals

DeLorenzi, G; Flynn, C. P.

doi:10.1088/0022-3719/18/26/001

Cited by 4 publications

(1 citation statement)

References 8 publications

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“…Previous molecular dynamics (MD) simulations of shape memory have not found a twinned martensite with well defined group-subgroup relation, 7 or have had significant surface or finite-size effects 8,9 which have long been known to affect phase behavior. 10 One implication of this is that nanowires of materials without phase transitions could still exhibit shape memory driven by surface reorientation. 11,12 The martensitic transformation can either be temperature driven, as for the shape memory effect, or stress induced.…”

Section: Introductionmentioning

confidence: 99%

Twinning hierarchy, shape memory, and superelasticity demonstrated by molecular dynamics

2011

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A martensitic phase transition exhibiting shape memory, transformation-induced plasticity, or superelasticity typically involves a transformation between a high temperature, high symmetry phase and a low temperature, low symmetry phase. There have been numerous attempts using molecular dynamics to simulate the shape memory behavior, where the memory is stored in a twinned martensite and deformation occurs by motion of twin boundaries. However, the 3D case has always proved elusive, because suitable interatomic potentials to produce a unique low temperature phase are difficult to obtain. Here we present a study in which the binary Morse potential is tuned specifically to maximize the difference between L1 0 and B19 (Strukturbericht notation, spacegroups P4/mmm and Pmma) structures. The twinned structure of martensite has been induced by gradually cooling the sample below the transition temperature. A bar-shaped sample was plastically deformed in the martensite phase, and on reheating above the transition temperature the initial shape was recovered. The effect of the shear-induced phase transition on the nanostructure of resulting martensite has also been investigated. An unusual discovery is that of a hierarchy of twins: nanotwins accommodate the mismatch between austenite and martensite at the habit plane, while dynamically created macrotwins are responsible for the deformation behavior and shape memory.

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Section: Introductionmentioning

confidence: 99%

Twinning hierarchy, shape memory, and superelasticity demonstrated by molecular dynamics

2011

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Pressure effects on martensitic transformation under quenching process in a molecular dynamics model of NiAl alloy

Kazanç

Özgen

Adigüzel

2003

Physica B: Condensed Matter

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Fluctuation effects in first-order phase transitions: Theory and model for martensitic transformations

Lindgrd

Mouritsen

1990

Phys. Rev. B

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Martensitic transitions, fluctuation processes and the effect of boundary conditions in pair-force model crystals

Cited by 4 publications

References 8 publications

Twinning hierarchy, shape memory, and superelasticity demonstrated by molecular dynamics

Twinning hierarchy, shape memory, and superelasticity demonstrated by molecular dynamics

Pressure effects on martensitic transformation under quenching process in a molecular dynamics model of NiAl alloy

Fluctuation effects in first-order phase transitions: Theory and model for martensitic transformations

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