Effect of temperature and texture on the reorientation of martensite variants in NiTi shape memory alloys

Laplanche, Guillaume; Birk, Thorsten; Schneider, S.; Frenzel, Jan; Eggeler, Gunther

doi:10.1016/j.actamat.2017.01.023

Cited by 127 publications

(30 citation statements)

References 85 publications

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“…As the representative shape-memory alloys (SMAs), NiTi alloys have been extensively applied in medicine, aerospace, automotive, electronics, machinery, and other industries [1][2][3][4][5][6][7][8], which ascribes to their excellent properties of shape memory effects (SMEs), superelasticity (SE), high-strength, corrosion resistance, and biocompatibility [9][10][11][12][13]. For the studies of NiTi SMAs, plenty of works have been carried out by theory and experiment [14][15][16][17][18]. Haskins and Lawson [19] investigated the temperature-dependent thermodynamic properties of NiTi alloys by density functional theory molecular dynamics (DFT-MD), and then analyzed the finite temperature properties of three phases (ground state monoclinic B33, martensitic B19', and austenitic B2), and the results revealed that the anharmonic effects played a large role in both stabilizing the austenite B2 phase and suppressing the martensitic phase transition.…”

Section: Introductionmentioning

confidence: 99%

First-Principles Calculations of Structural, Mechanical, and Electronic Properties of the B2-Phase NiTi Shape-Memory Alloy Under High Pressure

Fang

Liu

2019

Computation

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A first-principles calculation program is used for investigating the structural, mechanical, and electronic properties of the cubic NiTi shape-memory alloy (SMA) with the B2 phase under high pressure. Physical parameters including dimensionless ratio, elastic constants, Young’s modulus, bulk modulus, shear modulus, ductile-brittle transition, elastic anisotropy, and Poisson’s ratio are computed under different pressures. Results indicate that high pressure enhances the ability to resist volume deformation along with the ductility and metallic bonds, but the biggest resistances to elastic and shear deformation occur at P = 35 GPa for the B2-phase NiTi SMA. Meanwhile, the strong anisotropy produced by the high pressure will motivate the cross-slip process of screw dislocations, thereby improving the plasticity of the B2-phase NiTi SMA. Additionally, the results of the density of states (DOS) reveal that the B2-phase NiTi SMA is essentially characterized by the metallicity, and it is hard to induce the structural phase transition for the B2-phase NiTi SMA under high pressure, which provides valuable guidance for designing and applying the NiTi SMA under high pressure.

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Section: Introductionmentioning

confidence: 99%

First-Principles Calculations of Structural, Mechanical, and Electronic Properties of the B2-Phase NiTi Shape-Memory Alloy Under High Pressure

Fang

Liu

2019

Computation

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“…Finally, this work demonstrates that in-situ microLaue diffraction provides a reasonable balance between characterizing a bulk specimen while still capturing microstructural deformation mechanisms. The microstructural detail of this method is superior to neutron diffraction [7] or digital image correlation studies [19] and comparable to recent high-energy X-ray diffraction work [20]. The interrogated area is significantly larger than TEM-based observations of martensite deformation [21].…”

Section: Resultsmentioning

confidence: 70%

In-situ, microscale characterization of heterogeneous deformation around notch in martensitic Shape Memory Alloy

Paul

Paranjape

Tamura

et al. 2020

Materials Science and Engineering: A

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Deformation characterization of low-symmetry phases such as martensite in SMAs is challenging due to a finescale hierarchical microstructure. Using X-ray microLaue diffraction, in-situ deformation of martensite is examined in a notched NiTi specimen. The local deformation is influenced by the notch stress field, initial martensite microstructure, and interaction between notch stress field and the external load. The microstructure evolves heterogeneously and inelastically, with detwinning and twin nucleation occurring simultaneously through loading. These results contrast with the traditional view of martensite deformation that is partitioned in three distinct regimes: elasticity, reorientation and de-twinning.

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“…MPa/K) [4]. Wires typically present a 111 texture [45,46], which is the predominant texture in the drawing direction of NiTi tubes [12]. • dσ tr /dT for forward transformation is always smaller than dσ tr /dT for reverse transformation;…”

Section: Anisotropy Of Forward and Reverse Transformation Stressesmentioning

confidence: 99%

Anisotropy and Clausius-Clapeyron relation for forward and reverse stress-induced martensitic transformations in polycrystalline NiTi thin walled tubes

Grassi

Chagnon

Oliveira

et al. 2020

Mechanics of Materials

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Inside the Clausius-Clapeyron regime, transformation stresses during superelastic tensile tests of polycrystalline shape memory alloys are linearly dependent on temperature, with coefficients being the slopes of the forward and reverse transformation lines. In this work, experiments are performed to investigate the anisotropy of the slopes of the forward and reverse transformation stress-temperature lines in a NiTi superelastic thin walled tube. The classical Clausius-Clapeyron relation is widely used to model these slopes, although, in a strict sense, this relation is defined at thermodynamic equilibrium. Experimen

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Effect of temperature and texture on the reorientation of martensite variants in NiTi shape memory alloys

Cited by 127 publications

References 85 publications

First-Principles Calculations of Structural, Mechanical, and Electronic Properties of the B2-Phase NiTi Shape-Memory Alloy Under High Pressure

First-Principles Calculations of Structural, Mechanical, and Electronic Properties of the B2-Phase NiTi Shape-Memory Alloy Under High Pressure

In-situ, microscale characterization of heterogeneous deformation around notch in martensitic Shape Memory Alloy

Anisotropy and Clausius-Clapeyron relation for forward and reverse stress-induced martensitic transformations in polycrystalline NiTi thin walled tubes

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