Full-field strain evolution during intermartensitic transformations in single-crystal NiFeGa

Efstathiou, C.; Şehitoğlu, Hüseyin; Carroll, Jay; Lambros, John; Maier, Hans Jürgen

doi:10.1016/j.actamat.2008.04.033

Cited by 83 publications

(48 citation statements)

References 17 publications

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“…In the case of Ni 2 FeGa [36] and CuZnAl alloys (unpublished), our DIC results show that the transformation zone spreads to the entire gage section upon large deformations, so the local and overall strains are similar at 12 and 9% respectively. Similarly, the strains have been found to be uniform across the gage length in Ni 2 MnGa [37].…”

Section: Transformation Strain-slip Resistance Behavior Of Smasmentioning

confidence: 60%

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 Smasmentioning

confidence: 60%

Shape memory strains and temperatures in the extreme

Şehitoğlu

Patriarca

2017

Current Opinion in Solid State and Materials Science

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“…At higher temperatures (T > 323 K) a drastic stress drop followed by a single plateau is observed in the s(3)-curves in tension. This is a result of the simultaneous formation of both 14M (6% strain) and L1 0 (13% strain) martensites [5]. Along the stress plateau the L1 0 -martensite grows, whereas the bands of the 14M phase do not increase upon further straining.…”

Section: Resultsmentioning

confidence: 97%

“…The mechanical hysteresis Ds was determined as the stress difference between the forward and the reverse stress-induced transformation at the middle of the SE curve. The maximum SE strain amounts to Specifically, for M s < T < 323 K the two plateaus observed on the s (3)-curves are a result of the L2 1 /10M/14M and 14M/L1 0 transformation sequence, as demonstrated by in-situ experiments, which employed digital image correlation (DIC) for local strain measurements with high spatial resolution [5]. At higher temperatures (T > 323 K) a drastic stress drop followed by a single plateau is observed in the s(3)-curves in tension.…”

Section: Resultsmentioning

confidence: 97%

Tension/compression asymmetry of functional properties in [001]-oriented ferromagnetic NiFeGaCo single crystals

Panchenko¹,

Chumlyakov²,

Maier

et al. 2010

Intermetallics

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“…Further details can be found in references [138][139][140]. The study of classical and innovative alloys always requires an in-depth analysis of the basic properties of the SMA.…”

Section: Part Fivementioning

confidence: 99%

Shape memory alloys as an effective tool to damp oscillations

Torra¹,

Isalgué

Lovey

et al. 2015

J Therm Anal Calorim

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The SMA was studied for their macroscopic application in damping for civil engineering. The study is a synthesis and includes an outline of the models required for the SMA simulation and some case studies using the finite element analysis methods. This work is an overview that focuses in the mitigation of the oscillations in structures induced by earthquakes, and for a reduction of the oscillations amplitude in stayed cables under the action of rain, wind or traffic. The analysis needs the required conditions for each application determining the working conditions. The study includes the number of working cycles, the temperature effects and the cooling actions and, for instance, the action of the cycling frequency. The main target relates the appropriateness of the SMA for each purpose, and the suitability of the SMA device is always experimentally guaranteed. Furthermore, the applicability of the obtained results for SMA and the practical behavior of the SMA dampers were studied in international facilities. The paper includes appropriate suggestions for a correct preparation of the SMA dampers. This work outlines the effects of stress and temperature aging in NiTi, describes the particular structural effects between 18R and 6R, introduces a first attempt in the dynamic properties of the CuAlBe single crystals and summarizes some recent suggestions for damping using SMA.Keywords Shape memory alloys Á Martensitic transformation Á NiTi Á CuAlBe Á Damping Á Fatigue Part oneThe martensitic transformation (MT) is the origin of the unique properties of shape memory alloys (SMA) [1,2]. MT is a first-order phase transition between metastable phases with hysteresis. The transformation takes place with small displacements of the atoms and without any change in the positions of the neighboring atoms: Atomic order is conserved in the transformation. The transformation can be induced by temperature or by external forces, such as traction or compression. In temperature-induced transformations, M s (martensite start) denotes the starting temperature. The M f (martensite finish) temperature determines the end of the transformation, and A s and A f denote the austenite start and the austenite finish temperatures, respectively. This part was devoted to general contents and properties of the SMA appropriate for damping of oscillations. In particular, reduction of oscillations appeared in civil engineering structures.

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Full-field strain evolution during intermartensitic transformations in single-crystal NiFeGa

Cited by 83 publications

References 17 publications

Shape memory strains and temperatures in the extreme

Shape memory strains and temperatures in the extreme

Tension/compression asymmetry of functional properties in [001]-oriented ferromagnetic NiFeGaCo single crystals

Shape memory alloys as an effective tool to damp oscillations

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