Martensitic transitions and mechanical spectroscopy of Ni50.8Ti49.2 alloy containing hydrogen

Biscarini, A.; Campanella, R.; Coluzzi, B.; Mazzolai, Giovanni; Trotta, L.; Tuissi, A.; Mazzolai, F.M.

doi:10.1016/s1359-6454(99)00337-7

Cited by 61 publications

(58 citation statements)

References 19 publications

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“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] When heating and cooling TiNi-based SMAs, there is an internal friction (tan ) peak with a storage modulus (E 0 ) minimum corresponding to the martensitic transformation. 5) In addition, it has been reported that the formation of premartensite R-phase in TiNi-based SMAs can strongly soften the storage modulus and thus augment the internal friction during transformation.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, most of the internal friction studies of TiNi-based SMAs focus on the damping characteristics of IF Tr . [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] However, for high damping materials, it is more important to consider the damping characteristics of IF PT and IF I since most engineering applications for these materials are used at a constant temperature (especially at room temperature) instead of a constant temperature rate. Here, the term (IF PT +IF I ) is referred to as the inherent internal friction.…”

Section: Introductionmentioning

confidence: 99%

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Inherent Internal Friction of Ti51Ni39Cu10 Shape Memory Alloy

Chang

2007

Mater. Trans.

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Ti 51 Ni 39 Cu 10 SMA is more suitable than Ti 50 Ni 50 SMA for use as a high damping alloy at room temperature because it has higher inherent internal friction and wider martensitic transformation temperature range. Experimental results show that tan values of both (IF PT +IF I ) B2!B19 and (IF PT +IF I ) B19!B19 0 of Ti 51 Ni 39 Cu 10 SMA are linearly proportional to 0 = 1=2 when the applied and 0 are within 10 Hz and 15 mm, respectively. Since defects and dislocations pin the martensite twin boundaries and obstruct their mobility, it is important to prevent the introduction of defects or dislocations into the solution-treated Ti 51 Ni 39 Cu 10 SMA to maintain its high inherent internal friction.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Inherent Internal Friction of Ti51Ni39Cu10 Shape Memory Alloy

Chang

2007

Mater. Trans.

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“…Hydrogen plays a crucial role in determining the damping properties of the martensites introducing new IF peaks and markedly affecting those usually exhibited by materials not intentionally doped with H. [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22]40 Understanding the damping spectrum of NiTi based SMA has been and still is a puzzling task, because preliminary treatments usually given to the materials before any experiment, such as solubilization in a static argon atmosphere followed by water quenching (treatment swq), lead to H contamination of the samples. This contamination, which first was assumed, 9 then experimentally proved, 19 involves amounts of H so small that their effects on physical properties are usually negligible.…”

Section: Phenomenology Of Damping Peaks In Martensitesmentioning

confidence: 99%

“…Several review reports are now available concerning the results achieved in SMA with this technique [3][4][5][6] and the reader is referred to them for the older literature. In the present review we focus our attention to some recently discovered features of the damping spectrum of NiTi based SMA regarding the influence of hydrogen and compositional structural defects on the response strain to an applied stress field.…”

Section: Introductionmentioning

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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“…[16][17][18][19][20][21]. Mazzolai and co-workers investigated and reported important parameters describing solubility and diffusion of interstitial hydrogen in the bulk NiTi SMAs [17,18].…”

Section: Introductionmentioning

confidence: 99%

Ab initiostudy of point defects in NiTi-based alloys

et al. 2014

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Changes in temperature or stress state may induce reversible B2↔(R)↔ B19' martensitic transformations and associated shape memory effects in close-to-stoichiometric nickel-titanium (NiTi) alloys. Recent experimental studies confirmed a considerable impact of the hydrogen-rich aging atmosphere on the subsequent B2 austenite ↔ B19' martensite transformation path. In this paper, we employ Density Functional Theory to study properties of Ar, He, and H interstitials in B2 austenite and B19' martensite phases. We show that H interstitials exhibit negative formation energies, while Ar and He interstitials yield positive values. Our theoretical analysis of slightly Ni-rich Ni-Ti alloys with the austenite B2 structure shows that a slight over-stoichiometry towards Ni-rich compositions in a range 51-52 at.% is energetically favorable. The same conclusion holds for H-doped NiTi with the H content up to ≈ 6 at.%. In agreement with experimental data we predict H atoms to have a strong impact on the martensitic phase transformation in NiTi by altering the mutual thermodynamic stability of the high-temperature cubic B2 and the low-temperature monoclinic B19' phase of NiTi. Hydrogen atoms are predicted to form stable interstitial defects. As this is not the case for He and Ar, mixtures of hydrogen and the two inert gases can be used in annealing experiments to control H partial pressure when studying the martensitic transformations in NiTi in various atmospheres.

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Martensitic transitions and mechanical spectroscopy of Ni50.8Ti49.2 alloy containing hydrogen

Cited by 61 publications

References 19 publications

Inherent Internal Friction of Ti<SUB>51</SUB>Ni<SUB>39</SUB>Cu<SUB>10</SUB> Shape Memory Alloy

Inherent Internal Friction of Ti<SUB>51</SUB>Ni<SUB>39</SUB>Cu<SUB>10</SUB> Shape Memory Alloy

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

Ab initiostudy of point defects in NiTi-based alloys

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