Tension–compression asymmetry of the stress–strain response in aged single crystal and polycrystalline NiTi

Gall, Ken; Şehitoğlu, Hüseyin; Chumlyakov, Yuriy; Киреева, И. В.

doi:10.1016/s1359-6454(98)00432-7

Cited by 369 publications

(240 citation statements)

References 23 publications

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“…One has also to determine the habit plane normal at the same time. In addition, since no clear criterion to pick up an acceptable combination of the two BCVs to form (2) has been given yet, some trials are needed in the computation. The present study will show how the approach using infinitesimal theory simplifies computational processes.…”

Section: Discussionmentioning

confidence: 99%

“…To determine flow curves of a material, whose plastic deformation is produced by martensitic transformation, transformation strains of a martensite plate must be characterized [1][2][3]. Most studies along this line adopt results obtained by the phenomenological crystallographic theory of martensitic transformation [4,5].…”

Section: Introductionmentioning

confidence: 99%

“…The present study demonstrates this point. Also, if stress analysis is involved as in polycrystal transformation plasticity [1][2][3], infinitesimal theory is rather adequate, since stress analysis is usually based on infinitesimal theory. That is, consistency with using Hooke's law is observed.…”

Section: Introductionmentioning

confidence: 99%

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Infinitesimal approach to the crystallography of martensitic transformation: application to Ni-Ti

et al. 2000

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Infinitesimal approach to the crystallography of martensitic transformation: application to Ni-Ti

et al. 2000

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“…In the first case, it has been widely reported that the fine and coherent Ni4Ti3 precipiates can resist the plastic flow by acting as effective barriers to dislocation motion [31][32][33]. As a result, the Ni4Ti3 precipitates in the heat-treated sample would increase the stress required for plastic flow in the welded regions and meanwhile suppress the formation of dislocations during straining, as evidenced by the smaller amount of residual strain after cyclic SSRT comparing to the as-welded sample.…”

Section: Discussionmentioning

confidence: 99%

Reduction of environmentally induced cracking of laser-welded shape memory NiTi wires via post-weld heat-treatment

Chan

Man

2013

Materials Science and Engineering: A

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In this study, the environmentally induced cracking behaviour of the NiTi weldment with and without post-weld heat-treatment (PWHT) in Hanks' solution at 37.5 °C at OCP were studied by tensile and cyclic slow-strain-rate tests (SSRT), and compared with those tested in oil (an inert environment). Our previous results in the tensile and cyclic SSRT showed that the weldment without PWHT showed high susceptibility to the hydrogen cracking, as evidenced by the degradation of tensile and super-elastic properties when testing in Hanks' solution. The weldment after PWHT was much less susceptible to hydrogen attack in Hanks' solution as no obvious degradation in the tensile and super-elastic properties was observed, and only a very small amount of micro-cracks were found in the fracture surface. The susceptibility to hydrogen cracking of the NiTi weldment could be alleviated by applying PWHT at the optimized temperature of 350 °C after laser welding.

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“…[3] As a consequence, the study of the deformation and fracture behavior of Nitinol and its composites under various loading conditions becomes critical for the large-scale utilization of Nitinol. The mechanical response of Nitinol has been extensively studied experimentally and theoretically, at both quasistatic [10][11][12][13][14][15][16][17] and high strain rates. [18][19][20][21][22][23] However, the utilization and the potential application of Nitinol in long-life components as a structural material requires a thorough understanding of the dominant deformation and fracture mechanisms of Nitinol under different loading conditions.…”

Section: Introductionmentioning

confidence: 99%

Fracture of Nitinol under Quasistatic and Dynamic Loading

Jiang

Vecchio

2007

Metall Mater Trans A

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Owing to the potential application of Nitinol as an advanced structural material, it is essential to thoroughly understand the deformation and fracture behavior of Nitinol under various loading conditions. The present study explores the fracture behavior of Nitinol under quasistatic and dynamic loading, with emphasis on the fracture toughness and fracture mechanism of Nitinol. To this end, the precracked bend sample was employed to perform dynamic fracture testing using a modified (pulse-shaped) Hopkinson-pressure-bar-loaded fracture-testing system. The dynamic fracture initiation toughness was measured under stress-state equilibrium conditions at a loading rate of $ 10 6 MPa ffiffiffiffi m p /s. To further investigate the fracture mechanism, additional dynamic fracture tests were performed using double-crack, four-point bend samples. The experimental results indicate that the dynamic fracture toughness of Nitinol is higher than it is under quasistatic loading, and that the loading rate influences the fracture mechanisms of Nitinol. The interplay between the dynamic strength of Nitinol and the activation stress for stress-induced martensite (SIM) transformation plays an important role in the fracture behavior of Nitinol.

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Tension–compression asymmetry of the stress–strain response in aged single crystal and polycrystalline NiTi

Cited by 369 publications

References 23 publications

Infinitesimal approach to the crystallography of martensitic transformation: application to Ni-Ti

Infinitesimal approach to the crystallography of martensitic transformation: application to Ni-Ti

Reduction of environmentally induced cracking of laser-welded shape memory NiTi wires via post-weld heat-treatment

Fracture of Nitinol under Quasistatic and Dynamic Loading

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