SHAPE MEMORY EFFECT AND CYCLIC DEFORMATION BEHAVIOR OF Ti–Nb–N ALLOYS

Tahara, Masaki; Kim, Hee-Young; Hosoda, Hideki; Miyazaki, S.

doi:10.1142/s1793604709000600

Cited by 39 publications

(25 citation statements)

References 13 publications

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“…For Ti-xNb-1O alloys, superelasticity is observed when x is 22 at%, 48) implying that the addition of 1 at% O to Ti-Nb alloys decreases M s by about 160200 K because the effect of 1 at% O in decreasing the martensitic transformation temperature is equivalent to that of 45 at%Nb. N shows a similar effect on the martensitic transformation temperature; the addition of 1 at% N to Ti-Nb 49) and Ti-Nb-4Zr-2Ta 90) alloys decreases M s by about 200 K. However, the martensitic transformation temperature decreases by 75 K with 1 at% increase of N content for the Ti-18Zr-13Nb alloy. 91) It is suggested that this weaker effect of N on the martensitic transformation temperature in the alloy with relatively a higher content of Zr is due to its larger lattice parameter.…”

Section: Effect Of Interstitial Alloying Elementsmentioning

confidence: 82%

“…2533) Particularly, there has been tremendous progress in developing Ti-Nb base shape memory alloys in the past decade and many Ti-Nb base alloys have been developed, e.g. Ti-Nb-Sn, 26,34) Ti-NbAl, 31,32,35) Ti-Nb-Ta, 36,37) Ti-Nb-Zr, 3844) Ti-Nb-Mo, 45,46) TiNb-Pd, 47) Ti-Nb-O, 48) Ti-Nb-N, 49,50) Ti-Nb-Pt, 51) Ti-Nb-TaZr, 5254) Ti-Nb-Zr-Sn, 5557) Ti-Nb-Mo-Sn, 5860) Ti-Zr-NbSn, 61) Ti-Nb-Zr-Al 62) and Ti-Nb-Zr-Mo-Sn. 63) This paper aims to provide an overview of the recent works on Ti-Nb base shape memory alloys.…”

Section: Introductionmentioning

confidence: 99%

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Martensitic Transformation and Superelastic Properties of Ti-Nb Base Alloys

2015

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Ti-Nb base alloys have been proposed as prospective candidates for Ni-free biomedical superelastic alloys due to their excellent mechanical properties with good biocompatibility, and many kinds of Ti-Nb base alloys exhibiting shape memory effect or superelasticity have been developed up to now. However, typical Ti-Nb base superelastic alloys show a small recovery strain which is less than one third of the recovery strain of practical Ti-Ni superelastic alloys. Over the last decade there have been extensive efforts to improve the properties of Ti-Nb base superelastic alloys through microstructure control and alloying. Low temperature annealing and aging are very effective to increase the critical stress for slip due to fine subgrain structure and precipitation hardening. The addition of interstitial alloying elements such as O and N raises the critical stress for slip and improves superelastic properties. In this paper, the roles of alloying elements on the martensitic transformation temperature, crystal structure, microstructure and deformation behavior in the Ti-Nb base alloys are reviewed and the alloy design strategy for biomedical superelastic alloys is proposed.

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Section: Effect Of Interstitial Alloying Elementsmentioning

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Martensitic Transformation and Superelastic Properties of Ti-Nb Base Alloys

2015

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“…Over the past decade, Ti-Nb-base alloys have been extensively studied as promising candidates for Ni-free biomedical shape memory alloys, and many alloys have been reported to exhibit superelasticity at room temperature [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. For the binary Ti-Nb alloys, superelastic recovery was observed when the Nb content is 26-27 at.% [4]; however, the recovery strain was as small as about 3 % even including elastic strain, which is quite smaller than those of practical Ti-Ni superelastic alloys [15].…”

Section: Introductionmentioning

confidence: 99%

Crystal Structure, Transformation Strain, and Superelastic Property of Ti–Nb–Zr and Ti–Nb–Ta Alloys

Kim

Tobe

et al. 2015

Shap. Mem. Superelasticity

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The composition dependences of transformation strain and shape memory, and superelastic properties were extensively investigated in Ti-Nb-Zr and Ti-Nb-Ta alloys in order to establish the guidelines for alloy design of biomedical superelastic alloys. The effects of composition on the crystal structure of the parent (b) phase and the martensite (a 00 ) phase were also investigated. Results showed that not only transformation temperature but also transformation strain is tunable by alloy design, i.e., adjusting contents of Nb, Zr, and Ta. The lattice constant of the b phase increased linearly with increasing Zr content, while it was insensitive to Nb and Ta contents. On the other hand, the lattice constants of the a 00 phase are mainly affected by Nb and Ta contents. The increase of Zr content exhibited a weaker impact on the transformation strain compared with Nb and Ta. The addition of Zr as a substitute of Nb with keeping superelasticity at room temperature significantly increased the transformation strain. On the other hand, the addition of Ta decreased the transformation strain at the compositions showing superelasticity. This study confirmed that the crystallography of martensitic transformation can be the main principal to guide the alloy design of biomedical superelastic alloys.

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“…Addition of ternary or quaternary elements, such as Zr, Sn or Al, can also improve superelasticity [2,[13][14][15][16]. Particularly, addition of interstitial elements (O or N) allows a strong improvement of both superelastic properties and mechanical strength in binary Ti-Nb based alloys [2,7,17,18] or in more complex Ti-Nb based compositions [19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

In situ synchrotron X-ray diffraction study of the martensitic transformation in superelastic Ti-24Nb-0.5N and Ti-24Nb-0.5O alloys

et al. 2015

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Mechanisms of superelasticity were investigated by in situ cyclic tensile tests performed under synchrotron X-ray radiation on Ti-24Nb-0.5N and Ti-24Nb-0.5O compositions of metastable b titanium alloys. Analyses of diffraction patterns acquired under load and after unloading for each cycle were used to determine the characteristics of the potential mechanisms of deformation in both alloys. The Ti-24Nb-0.5N alloy exhibits the conventional behavior of superelastic b titanium alloys. Synchrotron X-ray diffraction (SXRD) experiments proved that superelasticity is exclusively due to the occurrence of a stress-induced martensitic (SIM) transformation from the b phase to the a 00 phase. The evolution of volume fraction of a 00 martensite corresponds exactly to the variation of the recovery strain of the cyclic tensile curve. Conversely, the Ti-24Nb-0.5O alloy displays a nonconventional behavior. SXRD experiments showed a huge ability of the b phase to deform elastically until 2.1%. Surprisingly, a reversible SIM transformation also occurs in this alloy but starts after 1% of applied strain that corresponds to the yield point of the stress-strain curve. Although the SIM transformation occurs, the b phase simultaneously continues to deform elastically. The superelasticity of this alloy is unexpectedly due to a combination of a high elastic deformability of the b phase and a reversible SIM transformation. In both alloys, the lattice parameters of the a 00 martensite evolve similarly in accordance with the initial texture of the b phase and the crystallography of the transformation.

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SHAPE MEMORY EFFECT AND CYCLIC DEFORMATION BEHAVIOR OF Ti–Nb–N ALLOYS

Cited by 39 publications

References 13 publications

Martensitic Transformation and Superelastic Properties of Ti-Nb Base Alloys

Martensitic Transformation and Superelastic Properties of Ti-Nb Base Alloys

Crystal Structure, Transformation Strain, and Superelastic Property of Ti–Nb–Zr and Ti–Nb–Ta Alloys

In situ synchrotron X-ray diffraction study of the martensitic transformation in superelastic Ti-24Nb-0.5N and Ti-24Nb-0.5O alloys

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