On the volume change in Co–Ni–Al during pseudoelasticity

Dilibal, Savaş; Şehitoğlu, Hüseyin; Hamilton, Reginald F.; Maier, Hans Jürgen; Chumlyakov, Yuriy

doi:10.1016/j.msea.2010.12.056

Cited by 33 publications

(16 citation statements)

References 19 publications

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“…The theoretical calculations for CRSS in Ni 2 FeGa, Co 2 NiGa, Co 2 NiA, NiTi, NiTiHf 25 , and CuZn results in 0.63, 0.76, 0.72, 0.71, 0.78 and 0.08 GPa respectively [38]. These values are consistent with corresponding experimental values presented in [20,[39][40][41][42][43][44][45][46][47].…”

Section: Transformation Strain-slip Resistance Behavior Of Smassupporting

confidence: 87%

Shape memory strains and temperatures in the extreme

Şehitoğlu

Patriarca

2017

Current Opinion in Solid State and Materials Science

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It is well known that the achievement of high transformation strains in shape memory alloys (SMAs) has been curtailed by plastic deformation mediated via dislocation slip. In particular, the utilization of SMAs at high temperatures is also hindered by plastic slip. In this paper, an overview of the most important SMAs is provided by constructing transformation strain, transformation temperature, and slip resistance plots to put existing works in perspective. To this plots, we added results on NiTiHf alloys which impart both high temperature capability and high slip resistance at unprecedented levels. The remarkable finding is that NiTiHf alloys can undergo transformation strains near 20% and transformation temperatures exceeding 400 °C

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Section: Transformation Strain-slip Resistance Behavior Of Smassupporting

confidence: 87%

Shape memory strains and temperatures in the extreme

Şehitoğlu

Patriarca

2017

Current Opinion in Solid State and Materials Science

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“…Another important constitutive behavior characteristic of SMAs is the superelasticity (also known as pseudoelasticity) [70][71][72]. Superelasticity can be defined as complete recovery of forward transformation-induced macroscale strain upon removal of stress (under isothermal condition) [73][74][75] (due to reversibility of transformation). In Figure 2, the red loop describes the superelastic response of SMAs.…”

Section: Superelasticitymentioning

confidence: 99%

A revisit to atomistic rationale for slip in shape memory alloys

Chowdhury

Şehitoğlu

2017

Progress in Materials Science

120

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Performance degradation in shape memory alloys (SMA) arises due to a gradual loss of strain recoverability attributable to slip mediated plasticity. The slip-induced changes in SMAs can be profound creating accumulation of permanent strains, altering the critical stress and hysteresis in an adverse manner. Slip nucleation in ordered SMA lattices can often be triggered due to energetically favorable dissociation reactions. Partial slip can dominate over full slip, generating planar defects (e.g. anti-phase boundary, superlattice or complex stacking faults) as evidenced through electron microscopy. Considerable advances are made lately on physically rationalizing the observed plastic micromechanism(s) benefitting from quantum mechanical models. In-depth analyses of crystal variables (e.g. lattice ordering, atomic stacking and stable/metastable fault structures) subjected to intrinsic solid-state effects have unequivocally established the genesis of empirical slipping propensity in terms of atomic fault energetics. This article systematically revisits the empirical physical evidence of slip in important SMAs from the literature, presents the pertinent experimental findings, and then embarks on reviewing the

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“…Помимо нитинола, существуют и другие сплавы, обладающие эффектом памяти формы. Примерами могут быть сплавы Au-Cd и Cu-Zn-Al, причем последний имеет широкое практическое применение и может быть выплавлен в обычной атмосфере [10,11]. Тем не менее, системные исследования вопросов, связанных с синтезом сплавов с памятью формы, остаются в числе перспективных и востребованных.…”

Section: разработан новый аустенитный дисперсионно-твердеющий сплав нunclassified

The effect of heat treatment on the properties of the new iron-base alloy

Akimov¹,

Нури²

2015

EEJET

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On the volume change in Co–Ni–Al during pseudoelasticity

Cited by 33 publications

References 19 publications

Shape memory strains and temperatures in the extreme

Shape memory strains and temperatures in the extreme

A revisit to atomistic rationale for slip in shape memory alloys

The effect of heat treatment on the properties of the new iron-base alloy

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