Effect of Hydrogen on Transformation Characteristics and Deformation Behavior in a TiNi Shape Memory Alloy

Hoshiya, Taiji; Den, Shoji; Katsuta, Hiroshi; Ando, Hiroei

doi:10.2320/jinstmet1952.56.7_747

Cited by 12 publications

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“…[1][2][3][4][5][6][7][8][9] This is supported by the fact that the hydrogen embrittlement behavior of the alloy is not always the same for the same amount of absorbed hydrogen. [10][11][12] In particular, the martensite transformation is sensitively affected by the hydrogen states.…”

Section: Introductionmentioning

confidence: 65%

“…[10][11][12] In particular, the martensite transformation is sensitively affected by the hydrogen states. [1][2][3][4][5][6][7][8][9][10][11][12] However, the mechanisms underlying the effects of hydrogen states on the martensite transformation are complicated and remain unclear. The hydrogen states are often reflected in the hydrogen thermal desorption behavior.…”

Section: Introductionmentioning

confidence: 99%

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Effects of the Hydrogen Absorption Conditions on the Hydrogen Embrittlement Behavior of Ni–Ti Superelastic Alloy

2012

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The present study has investigated whether the hydrogen embrittlement behavior of Ni-Ti superelastic alloy can be changed by modifying the hydrogen absorption conditions. Upon immersion in H2SO4 or H3PO4 solution, the stress plateau due to the stress-induced martensite transformation becomes unclear and forms a gentle slope. In addition, the superelastic strain decreases with increasing immersion time. The peripheral part of the fracture surface of the immersed specimens is flat as usual, whereas the center part of the fracture surface is rough compared with that under other hydrogen absorption conditions reported previously. For the specimens immersed in H3PO4 solution, hydrogen thermal desorption tends to be observed at higher temperatures compared with the specimens immersed in H2SO4 solution. Moreover, for a longer immersion time, a second peak of hydrogen desorption is observed at a high temperature, indicating that the hydrogen states change with the hydrogen absorption conditions. The results of this study suggest that changing the hydrogen embrittlement behavior by modifying the hydrogen absorption conditions may enable the determination of the embrittlement mechanism of the alloy.

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Section: Introductionmentioning

confidence: 65%

Section: Introductionmentioning

confidence: 99%

Effects of the Hydrogen Absorption Conditions on the Hydrogen Embrittlement Behavior of Ni–Ti Superelastic Alloy

2012

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Transformation Behaviors and Microstructure Modifications in Hydrogen-Charged Ti–Ni Shape Memory Alloy

Kalbekov,

Akamine,

Ajito

et al. 2024

Shap. Mem. Superelasticity

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The effect of hydrogen charging duration on the transformation behavior, microstructural evolution, and dynamic microstructural changes associated with thermoelastic martensitic transformation in Ti–Ni shape memory alloy was investigated. Compared with the uncharged specimen, the martensitic transformation start (Ms) and reverse transformation finish (Af) temperatures increased with charging time, whereas the martensitic transformation finish and reverse transformation start temperatures remained almost unchanged. In situ SEM results were consistent with these behaviors. Upon cooling, the transformation progressed from the center to the surface in charged specimens, indicating a higher transformation temperature in the center than the surface. The latent heat of transformation decreased with increasing charging time, quantitatively attributed to an untransformed region consisting of hydrogen-induced martensite and a hydrogen-affected layer. The hydrostatic effect from those layers on the interior B2 phase was proposed as the origin of the increased Ms and Af temperatures.

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Hydrogen embrittlement of work-hardened Ni–Ti alloy in fluoride solutions

et al. 2005

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Effect of Hydrogen on Transformation Characteristics and Deformation Behavior in a TiNi Shape Memory Alloy

Cited by 12 publications

References 0 publications

Effects of the Hydrogen Absorption Conditions on the Hydrogen Embrittlement Behavior of Ni–Ti Superelastic Alloy

Effects of the Hydrogen Absorption Conditions on the Hydrogen Embrittlement Behavior of Ni–Ti Superelastic Alloy

Transformation Behaviors and Microstructure Modifications in Hydrogen-Charged Ti–Ni Shape Memory Alloy

Hydrogen embrittlement of work-hardened Ni–Ti alloy in fluoride solutions

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