Grain size and pseudoelastic behaviour of a Cu–Al–Be alloy

Montecinos, S.; Cuniberti, A.; Sepúlveda, A.

doi:10.1016/j.matchar.2006.11.009

Cited by 93 publications

(80 citation statements)

References 17 publications

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“…This effect is in a qualitative agreement with experimental observations, e.g. [8]. Note that an inverse relationship is observed in nano-crystalline materials [16], however, this effect is not covered by the present study.…”

Section: Minimization Of Total Incremental Energy Supplysupporting

confidence: 92%

On dissipation, interfacial energy and size eﬀects in shape memory alloys

Stupkiewicz

Petryk

2009

ESOMAT 2009 - 8th European Symposium on Martensitic Transformations

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Abstract. This work presents a multiscale approach aimed at the modelling of evolution of martensitic microstructures with account for the interfacial energy effects. The total Helmholz free energy and the energy dissipated in the system are split into contributions from the bulk material, from phase interfaces and from other boundaries. Microstructure evolution is then determined by the incremental energy minimization. As an application, stress-induced transformation is considered which proceeds by formation and growth of internally twinned martensite plates within the austenite matrix. The interfacial energy is examined at three scales, namely at twin boundaries, austenite-martensite interfaces and at grain boundaries. Both atomic-scale and the elastic micro-strain interfacial energies are included and respective estimates are taken from the materials science literature or predicted using micromechanical finite element analysis. Examples are provided for the cubic-to-orthorhombic transformation in a CuAlNi shape memory alloy. They illustrate the effect of grain size on the macroscopic stress-strain response including the hysteresis width.

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Section: Minimization Of Total Incremental Energy Supplysupporting

confidence: 92%

On dissipation, interfacial energy and size eﬀects in shape memory alloys

Stupkiewicz

Petryk

2009

ESOMAT 2009 - 8th European Symposium on Martensitic Transformations

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“…Decreasing the ratio of grain size to specimen size leads to a stricter compatibility requirement and thus inhibits the martensitic phase transformation. In fact, the increase in the critical martensitic transformation stress O-Ms and the decrease in the martensite start temperature Ms for decreasing grain size-to-specimen size ratio were reported in [109, 122,71,120]. In addition, Chen and Schuh proposed another intrinsic size-dependent effect.…”

Section: Experimentally Observed Size-dependent Mechanical Responses mentioning

confidence: 92%

Computational modeling of size-dependent superelasticity of shape memory alloys

Qiao

Radovitzky

2016

Journal of the Mechanics and Physics of Solids

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The superelastic effect in shape memory alloys (SMAs) is attributed to the stressinduced reversible austenitic-martensitic phase transformations. It is characterized by the development of significant strains which are fully recoverable upon unloading, and also characterized by the stress-hysteresis in the loading and unloading cycle which corresponds to the energy dissipated during phase transformations. Recently, experiments have revealed size-dependent effects in the superelastic responses of SMAs at micro-and nanoscales. For instance, the CuAlNi microwires and submicron pillars show a substantially higher capacity for the energy dissipation than that of bulk samples, which offers a significant promise for the applications in protective materials.In this thesis, a continuum model is developed in order to improve our understanding of size effects in SMAs at small scales. The modeling approach combines classic superelastic models, which use the volume fraction as an internal variable to represent the martensitic phase transformation, with strain gradient plasticity theories. Size effects are incorporated through two internal length scales, an energetic length scale and a dissipative length scale, which correspond to the martensitic volume fraction gradient and its time rate of change, respectively. Introducing the gradient of the martensitic volume fraction leads to coupled macro-and microforce balance equations, where the displacements and the martensitic volume fraction are both independent fields. A variational formulation for the temporally-discretized coupled macro-and microforce balance equations is proposed, as well as a computational framework based on this formulation. A robust and scalable parallel algorithm is implemented within this computational framework, which enables the large-scale three-dimensional study of size effects in SMAs with unprecedented resolution. This modeling and computational framework furnishes, in effect, a versatile tool to analyze a broad range of problems involving size effects in superelasticity with the potential to guide microstructure design and optimization. In particular, the model captures the increase of the stress hysteresis and strain hardening in bulk polycrystalline SMAs for decreasing grain size, as well as the increase of the residual strain for decreasing pillar size in NiTi pillars. The model confirms that constraints like grain boundaries 3 and the surface Ti oxide layer are responsible for the size-dependent superelasticity in SMAs.

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“…Cu-(13 wt.%) Al shape memory alloys with addition small amount of beryllium per elastic effect at room temperature, because the martensitic transformation from the austenite phase (β) have BCC crystal structure to marten site phase (18R) have monoclinic crystal structure [1][2][3][4][5][6]. The application of these alloy used as absorb vibration damping effect in bridge and building structure [7].…”

Section: Introductionmentioning

confidence: 99%

Effect of Aging on Corrosion Behavior of Martensite Phase in Cu-Al-Be Shape Memory Alloy

Jt¹,

Am²,

Az³

2017

J Nanomed Nanotechnol

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Grain size and pseudoelastic behaviour of a Cu–Al–Be alloy

Cited by 93 publications

References 17 publications

On dissipation, interfacial energy and size eﬀects in shape memory alloys

On dissipation, interfacial energy and size eﬀects in shape memory alloys

Computational modeling of size-dependent superelasticity of shape memory alloys

Effect of Aging on Corrosion Behavior of Martensite Phase in Cu-Al-Be Shape Memory Alloy

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