Effect of hydrostatic pressure on thermally induced phase transformation in NiTi alloy: A molecular dynamics study

Wan, Jia-Lu; Chen, Zhibin; Qin, Shengjian; Shang, Jia‐Xiang

doi:10.1016/j.commatsci.2018.06.035

Cited by 11 publications

(8 citation statements)

References 36 publications

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“…At 143 K, as shown in Figure 19c, the model completes the second stage of martensite phase transformation, and the majority of the austenite phase transforms into martensite phase. The models undergo a two-step martensite phase transformation during the cooling process, which is in agreement with the findings of Wan et al [35] During the heating process, the average atomic potential energy undergoes a sudden rise. It indicates that the reverse phase transformation of martensite do not exhibit a segmentation phenomenon.…”

Section: Temperature-induced Phase Transformationsupporting

confidence: 91%

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: Temperature-induced Phase Transformationsupporting

confidence: 91%

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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Section: Phase Transformation Temperaturementioning

confidence: 62%

“…Phase transformation temperatures decreased by~4 K and~11 K as normal stress increased to 0.5 GPa and 1.1 GPa, as shown in Figure 4b. Wan et al [32] reported similar results such that phase transformation temperatures decreased by 5-10 K as hydrostatic pressure increased from 0 GPa to 1 GPa. On the other hand, results from normal + shear stresses showed a different trend.…”

Section: Phase Transformation Temperaturementioning

confidence: 65%

Molecular Dynamics Study of Bulk Properties of Polycrystalline NiTi

Lee

Shin

2021

Metals

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Molecular dynamics (MD) simulations were carried out to study the bulk polycrystalline properties of NiTi. Thermally driven phase transitions of NiTi between martensite and austenitewere simulated using single crystalline simulation domains. With external stress boundary conditions, MD simulation successfully predicted experimentally observed phase transformation temperatures of bulk polycrystalline. Elastic characteristics of NiTi martensite were simulated using polycrystalline simulation domains that consist of realistic disorientations and grain boundary structures. The existence of grain disorientation and grain boundary lowered the potential energy of the simulation domain, which led to more realistic elastic modulus prediction. Analysis of simulation domains that predicted realistic bulk polycrystalline properties showed that the major difference between single crystalline and polycrystalline structures is atomic stress distribution.

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“…[20,55,56] Also, the imposed hydrostatic pressure of the HPT can lower the martensite to austenite transformation temperature. [22,57] In the case of HPT of a Ni-rich NiTi alloy where a parent B2 to B19´transformation occurs by the application of pressure during loading, it was argued that in deformation-induced nanograins, the B19´martensite can revert to the B2 austenite after (or during) release of hydrostatic pressure by unloading, denoted as size baroeffect. [21] In contrast, in the present case of a Ti-rich NiTi alloy containing stable B19´martensite in its coarse-grained defect-free state, a size baroeffect is not confirmed.…”

Section: Hpt Deformation Of Niti Shape Memory Alloymentioning

confidence: 99%

In Situ Synchrotron X‐Ray Diffraction during High‐Pressure Torsion Deformation of Ni and NiTi

et al. 2021

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Effect of hydrostatic pressure on thermally induced phase transformation in NiTi alloy: A molecular dynamics study

Cited by 11 publications

References 36 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

Molecular Dynamics Study of Bulk Properties of Polycrystalline NiTi

In Situ Synchrotron X‐Ray Diffraction during High‐Pressure Torsion Deformation of Ni and NiTi

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