Influence of annealing on incomplete detwinning and deformation twinning in equiatomic NiTi shape memory alloy undergoing severe plastic deformation

Sun, Dong; Jiang, Shengyao; Zhang, Yanqiu; Yan, Bingyao; Yu, Junbo

doi:10.1016/j.jallcom.2021.159550

Cited by 20 publications

(4 citation statements)

References 45 publications

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“…This finding aligns with the experiments conducted by Wang et al, [ 10 ] which observed a two‐step martensite transformation in NiTi. Similarly, Sun et al [ 42 ] also discovered that annealed NiTi samples at 600 °C exhibited a two‐stage transformation during cooling and a one‐stage transformation during heating. These experimental results validate the rationality and reliability of our simulation findings.…”

Section: Resultsmentioning

confidence: 93%

Surface Effect on Phase Transformation of Single Crystal NiTi Shape Memory Alloys Studied by Molecular Dynamics Simulation

Liu

Wang

et al. 2023

Adv Eng Mater

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Surface effect on phase transformation of single crystal (SC) NiTi shape memory alloys (SMAs) with various thicknesses and various Ni contents is studied by molecular dynamics simulation. For the SMAs with various thicknesses considering surface effect, the residual strain, the average atomic potential energy, and the four characteristic phase transformation temperatures all increase, and fewer twinned martensite boundaries are left after cooling compared to the sample without considering surface effect. Moreover, with increasing thickness of the sample, the surface effect is gradually weakened, and there is no obvious regularity in phase transformation characteristics. For the SMAs with various Ni contents considering surface effect, segmental martensite phase transformation, phase transformation fluctuation, and wider phase transformation temperature ranges are observed, whereas these phenomena do not occur in the sample without considering surface effect. With the increasing of Ni contents, for both cases of considering surface effect or not, the critical stress of phase transformation, average atomic potential energy, the modulus of detwinned martensite increase, but the phase transformation temperature and modulus of twinned martensite decrease.

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Section: Resultsmentioning

confidence: 93%

Surface Effect on Phase Transformation of Single Crystal NiTi Shape Memory Alloys Studied by Molecular Dynamics Simulation

Liu

Wang

et al. 2023

Adv Eng Mater

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“…Shape memory alloy (SMAs) possess many good properties such as dimensional stability, shape memory properties, ductility and workability [1][2][3][4]. NiTi alloys are the most commercially viable SMAs and have been widely used in many practical applications.…”

Section: Introductionmentioning

confidence: 99%

Effects of Severe Plastic Deformation and Subsequent Annealing on Microstructures of a Ni50.6Ti49.4 Shape Memory Alloy

Zhang,

Wang,

et al. 2024

Metals

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High-pressure torsion (HPT) was applied to the Ni50.6Ti49.4 (at. %) alloy ingot up to 1/4, 2, 16, 32 and 48 turns under a pressure of 6.0 GPa. The samples were examined by X-ray diffraction (XRD), transmission electron microscope (TEM) and microhardness measurement. The results indicate that martensitic transformation and formation of amorphous phase occurred during the HPT process. As the HPT turns increased, the more the amorphous phase formed. The fraction of amorphization was analyzed based on the X-ray results. The microhardness increased with the HPT turns, which may be related to strain-induced martensite transformation, formation of the amorphous phase, increased dislocation densities and grain refinement. Differential scanning calorimetry (DSC) test revealed that shape memory alloys can be produced by HPT and post-HPT annealing from a NiTi ingot.

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“…An ultra-high tensile strength of 880 ±13 MPa and an excellent shape memory effect with a recovery rate larger than 90% were demonstrated in their results. Sun et al [35] studied the effect of annealing treatment on the transformation behaviors of samples undergoing compression. It was found that samples annealed at 300°C and 450°C exhibited one-stage phase transformation during heating and cooling, while specimens annealed at 600°C exhibited two-stage transformation on cooling and one-stage transformation on heating.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and phase transformation of nickel-titanium shape memory alloy fabricated by directed energy deposition with in-situ heat treatment

Gao

Bodunde

Qin

et al. 2022

Journal of Alloys and Compounds

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Influence of annealing on incomplete detwinning and deformation twinning in equiatomic NiTi shape memory alloy undergoing severe plastic deformation

Cited by 20 publications

References 45 publications

Surface Effect on Phase Transformation of Single Crystal NiTi Shape Memory Alloys Studied by Molecular Dynamics Simulation

Surface Effect on Phase Transformation of Single Crystal NiTi Shape Memory Alloys Studied by Molecular Dynamics Simulation

Effects of Severe Plastic Deformation and Subsequent Annealing on Microstructures of a Ni50.6Ti49.4 Shape Memory Alloy

Microstructure and phase transformation of nickel-titanium shape memory alloy fabricated by directed energy deposition with in-situ heat treatment

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