Thermoelastic phase transformation in TiNi alloys under cyclic instrumented indentation

Arciniegas, Milena P.; Gaillard, Yves; Peña, J.; Manero, J. M.; Gil, F.J.

doi:10.1016/j.intermet.2009.03.020

Cited by 29 publications

(18 citation statements)

References 37 publications

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“…1 unloadingereloading paths form a closed hysteresis loop, which is highly repetitive. These distinct loops in shape-memory alloys are associated with some degree of pseudoelasticity because of a forward and reverse phase transformation [9,12,14]. It can be mentioned that broader loops have been observed with spherical indenter in NiTi alloys [12].…”

Section: Resultsmentioning

confidence: 93%

“…However, the analysis of the loadedisplacement curves obtained by instrumented indentation presents a greater difficulty respect to those obtained by tensile and compressive tests due to the complex loading conditions. Evidence of the martensitic phase transformation induced by indentation has been previously reported as hysteresis loops produced between the unloading and reloading loadedisplacement curve [9,12]. In contrast, elasticeplastic materials present coincident unloadingereloading paths [16].…”

Section: Introductionmentioning

confidence: 90%

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Instrumented indentation of transforming and no-transforming phases in Cu–Al–Be shape-memory alloys

2012

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Section: Resultsmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 90%

Instrumented indentation of transforming and no-transforming phases in Cu–Al–Be shape-memory alloys

2012

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“…The quantitative stress analysis of nanoindentation on NiTi samples performed in [8] suggests that the stress required to induce the martensitic phase transformation at nanometer scales is on a par with macroscopic stresses required to induce it. Purely SE behavior (without any induced plasticity) was successfully observed in spherical indentation tests performed in [9].…”

Section: Proceedings Of the International Symposium On Physics Of Matmentioning

confidence: 86%

Characterization of Superelastic NiTi Alloys by Nanoindentation: Experiments and Simulations

et al. 2015

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NiTi-based shape memory alloys are metallic materials exhibiting remarkable response to mechanical and/or thermal loading, e.g. superelasticity, pseudoplasticity or one-way shape memory eect. They can be engineered into structures of micro-size dimensions, hence, they appear promising for application in micro-electromechanical systems. For their ecient utilization, appropriate characterization is important. Due to relative simplicity, indentation represents a very standard and popular technique for basic characterization of metallic materials providing information about stiness and hardness. Moreover, it can be used for identication of other events in the material. This study aims to verify applicability of the recently developed constitutive model for NiTi-based shape memory alloy in simulations of nanoindentation tests. The model is tted to a particular sample material using experimental data, and a series of simulations mimicking tests at various temperatures is performed. Since the model also captures two-stage martensitic transformation via the intermediate R-phase, its inuence on the simulations is investigated as well. It is conrmed that spherical indentation is a suitable method for simple and fast detection whether the material is in superelastic or pseudoplastic regime.

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“…In fact, the latter is expected to play a significant role in the indentation response of SMAs, as this takes place in the indentation region due to the presence of highly localized stresses. As a consequence, well known contact mechanics theories for conventional metals cannot be directly applied to SMAs and work has been carried out, in recent years, to understand better the effects of microstructural transitions on the indentation response of both thin films [3][4][5][6][7][8] and bulk specimens [9][10][11][12][13][14][15]. These studies revealed marked effects of material composition, as well as the thermo-mechanical treatments carried out during material processing, on the indentation response of SMAs.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, a method to estimate the phase transformation stresses of a pseudoelastic alloy has been proposed in [13], based on comparing the indentation response of the SMA with that of a conventional elastic material. Finally, cyclic instrumented indentation was carried out in [14] so as to capture the stress-induced phase transition mechanisms from the experimentally measured load-displacement curves. However, notwithstanding the encouraging results obtained recently, considerable research needs to be carried out to elucidate the relationship between the indentation response of SMAs and their mechanical and functional properties.…”

Section: Introductionmentioning

confidence: 99%

Indentation response of a NiTi shape memory alloy: modeling and experiments

Maletta

Furgiuele

Sgambitterra

et al. 2012

Frattura Ed Integrità Strutturale

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ABSTRACT. The indentation response of a pseudoelastic nickel-titanium based shape memory alloy (SMA) has been analyzed. Indentation tests have been carried out at room temperature using a spherical diamond tip and indentation loads in the range 50-500 mN in order to promote a large stress-induced transformation zone in the indentation region and, consequently, to avoid local effects due to microstructural variations. The measured load-displacement data have been analyzed to obtain information on the pseudoelastic response of the alloy. To aid this analysis numerical simulations were performed, by using a commercial finite element (FE) software code and a special constitutive model for SMAs, so as to understand better the microstructural evolution occurring during the indentation process. Finally, the FE model has been used to analyze the effects of temperature on the indentation response of the alloy. This analysis revealed a marked variation of both the maximum and residual penetration depths with increasing test temperature. SOMMARIO.Nel presente lavoro è stata analizzata la risposta all'indentazione di una lega a memoria di forma (SMA -Shape Memory Alloy) a base di nickel e titanio. In particolare, sono state eseguite prove di indentazione mediante l'utilizzo di un indentatore sferico e per livelli di carico compresi tra 50 e 500 mN, al fine di favorire la formazione di zone di trasformazione ampie e, pertanto, evitare effetti locali dovuti a variazioni microstrutturali. Le curve carico-spostamento sono state analizzate al fine di ottenere informazioni utili per la comprensione del comportamento pseudoelastico della lega. A tale scopo, sono state condotte analisi numeriche, utilizzando un software commerciale agli elementi finiti, per meglio comprendere i cambiamenti microstrutturali, che avvengono durante il processo di indentazione. Infine, il modello numerico è stato utilizzato per analizzare l'effetto della temperatura sulla risposta all'indentazione delle SMAs. I risultati hanno mostrato una marcata variazione della profondità di penetrazione e della profondità residua al variare della temperatura.

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Thermoelastic phase transformation in TiNi alloys under cyclic instrumented indentation

Cited by 29 publications

References 37 publications

Instrumented indentation of transforming and no-transforming phases in Cu–Al–Be shape-memory alloys

Instrumented indentation of transforming and no-transforming phases in Cu–Al–Be shape-memory alloys

Characterization of Superelastic NiTi Alloys by Nanoindentation: Experiments and Simulations

Indentation response of a NiTi shape memory alloy: modeling and experiments

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