Solubility and diffusion of hydrogen in TiNi1−xCux (x=0.2 and 0.4) shape memory alloys

Mazzolai, Giovanni

doi:10.1016/j.jallcom.2007.01.098

Cited by 10 publications

(9 citation statements)

References 13 publications

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“…Our calculation results revealed that with the increasing of Cu content, the decrystallization phenomenon was reinforced which may lead to the deterioration of hydrogen diffusivity. It concurred with the results reported by Mazzolai [30], that hydrogen diffusion coefficient of TiNi alloys decreased with increasing Cu substitution by experimental measurement.…”

Section: Electrochemical Measurementssupporting

confidence: 93%

The phase transformation and electrochemical properties of TiNi alloys with Cu substitution: Experiments and first-principle calculations

Zhang

Elkedim

et al. 2017

International Journal of Hydrogen Energy

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Section: Electrochemical Measurementssupporting

confidence: 93%

The phase transformation and electrochemical properties of TiNi alloys with Cu substitution: Experiments and first-principle calculations

Zhang

Elkedim

et al. 2017

International Journal of Hydrogen Energy

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“…Taking determined by Mazzolai [29] for cubic TiNi 0.8 Cu 0.2 , a value of 1.57 × 10 −12 cm 2 /s can be obtained at 23 • C.…”

Section: Resultsmentioning

confidence: 86%

Influence of B substitution for Ti and Ni on the electrochemical hydriding of TiNi

Drenchev

Spassov

2009

Journal of Alloys and Compounds

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“…The vanishing amounts of H remaining within the samples after this treatment is ensured by the extremely low H solubility (n H < 10 -5 ; n H =H/Me is the ratio between the number of H and metal (Me) atoms) in NiTi based alloys under the above conditions of pressure and temperature (Ref. 41).…”

Section: Phenomenology Of Damping Peaks In Martensitesmentioning

confidence: 99%

Recent progresses in the understanding of the elastic and anelastic properties of H-free, H-doped and H-contaminated NiTi based alloys

Mazzolai¹

2011

AIP Advances

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This review is focused on the influence of interstitial hydrogen and alloy compositional changes on the internal friction (IF) spectrum and elastic Young's modulus (E) of NiTi based shape memory alloys. In the martensitically transforming binary alloys Ni50+xTi50-x (x≤1.3) vacuum annealed and furnace cooled (H-free), besides the well known IF peak associated with the martensitic transition two additional non-thermally activated peaks (P150K and P200K′) are present due to some sort of second-order phase transitions. In martensitically transforming Ni50+xTi50-x and Ti50Ni50-yCuy alloys doped with hydrogen two thermally activated peaks, PTWH and PH, appear which originate from stress-assisted motions of H-twin boundary complexes and isolated H-elastic dipoles (Snoek effect), respectively. In a H-free martensitically non-trasforming alloy (x=2), besides the non-thermally activated peak P150K, a frequency dependent dip is observed in the E(T) curves at a temperature Tg. This dip is similar to that reported in the literature for two other non-transforming alloys (x=1.5 and x=2.5), which, however, were also found to exhibit a thermally activated IF peak just below Tg. Most likely, these two alloys were contaminated with hydrogen during the preliminary solubilization in argon atmosphere and subsequent water quenching treatments given to them. The Young's modulus dip and the lower temperature IF peak have been both attributed to a novel type of phase transition reported in the literature as “strain glass transition”. The introduction of hydrogen into the non-transforming alloy with x=2 enhances the Young's modulus dip and gives rise to the H-Snoek peak PH just below Tg, which clearly appears to be the counterpart of the peak observed in the alloys (x=1.5 and x=2.5) solubilized in argon atmosphere and water quenched. The conclusion was reached in the present work that this last peak is not related to the strain glass transition but is rather an H-Snoek relaxation

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Solubility and diffusion of hydrogen in TiNi1−xCux (x=0.2 and 0.4) shape memory alloys

Cited by 10 publications

References 13 publications

The phase transformation and electrochemical properties of TiNi alloys with Cu substitution: Experiments and first-principle calculations

The phase transformation and electrochemical properties of TiNi alloys with Cu substitution: Experiments and first-principle calculations

Influence of B substitution for Ti and Ni on the electrochemical hydriding of TiNi

Recent progresses in the understanding of the elastic and anelastic properties of H-free, H-doped and H-contaminated NiTi based alloys

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