Development and characterization of Ni-free Ti-base shape memory and superelastic alloys

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

doi:10.1016/j.msea.2006.02.054

Cited by 369 publications

(199 citation statements)

References 23 publications

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“…Ternary and quaternary Ti-Nb-based alloys have been extensively investigated over the last ten years and the results confirm the possibility of producing Ni-free, Ti-based alloys with superelasticity thanks to reversible to α′′ martensitic transformation [7]. Efforts to alloy binary Ti-Nb alloys with a third element, such as Ta or Zr were undertaken with the objectives of stabilizing the β phase at room temperature, creating conditions for ″ phase formation, decreasing the Young modulus, and promoting solid solution hardening, thereby improving the Ni-free titanium alloys' shape memory properties [8].…”

Section: Introductionsupporting

confidence: 53%

Mechanical properties of porous metastable beta Ti–Nb–Zr alloys for biomedical applications

Braïlovski

Прокошкин

Gauthier

et al. 2013

Journal of Alloys and Compounds

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Mechanical properties of porous metastable beta Ti-Nb-Zr alloys for biomedical applications Braïlovski, V.; Prokoshkin, S.; Gauthier, M.; Inaekyan, K.; Dubinskiy, S. melting. The obtained ingots were divided into two batches: the first subjected to cold rolling (CR) from 30 to 85% of thickness reduction, and subsequent annealing in the 450 to 600°C temperature range (1h). Regardless of the CR intensity, Ti-Nb-Zr samples subjected to 600°C annealing showed the highest fatigue resistance during roomtemperature cumulative cycling due to the stress-induced martensitic transformation occurring in the polygonized dislocation substructure (average subgrain size ∼ 100 nm). The second batch was atomized to produce 100-micronsize powders in order to manufacture open-cell porous material (cell size vary from 136 to 561 microns) of 46% porosity by means of powder metallurgy using a polymer-based foaming process. Tensile, compression and bending testing were performed at RT on foam samples annealed at 450 to 600°C (1h). Results indicated that Young's modulus of Ti-Nb-Zr foams significantly decreases as compared to the as-sintered material: when annealing temperature increases from 450 to 600°C, Young's modulus decreases from 10±2 GPa to 6±1 GPa. Under the same testing conditions, Ti-CP foams produced by the same technology and having similar porosity remain fairly insensible to post-sintering annealing.

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Section: Introductionsupporting

confidence: 53%

Mechanical properties of porous metastable beta Ti–Nb–Zr alloys for biomedical applications

Braïlovski

Прокошкин

Gauthier

et al. 2013

Journal of Alloys and Compounds

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“…The consequence is the stabilization of β phase, and the decrease of the critical cooling rates by which the transformations β→α and β→ω were completely suppressed for all cooling conditions. Many other authors agree that the higher the Ta content is, the lower will be the M s temperature [3,5,[18][19][20]. In the case of the sample 2 (after homogenization treatment) the martensitic transformation β→α was suppressed and the resulted structure was formed only by β phase, attested by XRD patterns in Fig.…”

Section: Results and Discussion For Xrd Measurementsmentioning

confidence: 83%

XRD and nanoindentation testing of thermo-mechanical processed Ti-29Nb-9Ta-10Zr alloy

Cincă¹,

Nocivin²,

Răducanu³

et al. 2021

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Ti-Nb-Ta-Zr alloys (TNTZ) represent a new class of biomaterials, due to nontoxic chemical elements and promising combination of high mechanical resistance with low elastic modulus close to the bone elasticity (E = 20-40 GPa). The present paper proposes a particular chemical composition of this β type Ti alloy -Ti-29Nb-9Ta-10Zr (wt.%) with a particular material structure. Structural and mechanical characterization of four distinct alloy conditions corresponding to each TM stage was performed using XRD measurements and also nanoindentation measurements. The obtained results represent a solid base for complex optimization of the alloy's structural characteristics.K e y w o r d s : beta titanium alloy, thermo-mechanical processing, XRD spectra, nanoindentation

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“…Oxygen-doped Ti-Nb-O shape memory alloy 26,27 was selected as a disordered martensitic system, whereas well studied disordered system is a nonstoichiometric Ti 48.5 -Ni 51.5 strain glass 9-14 because of the following reasons. The main difference between Ti-Nb-O and Ti-Ni systems is the type of disorder; interstitial atoms in Ti-Nb-O while substitutional atoms in Ti-Ni.…”

Section: Methodsmentioning

confidence: 99%

“…This is because a large decrease in T c ‫ء‬ by oxygen doping. 27 The other effect of disorder is the shape variation in hysteresis curves. The disorder dependence of hysteretic behavior is in qualitative agreement with that predicted by RFIM shown in Fig.…”

Section: A Interstitial Oxygen Atoms As a Source Of Effective Randommentioning

confidence: 99%

Effect of randomness on ferroelastic transitions: Disorder-induced hysteresis loop rounding in Ti-Nb-O martensitic alloy

et al. 2010

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We have studied the effect of disorder on the martensitic transformation ͑MT͒, especially on the hysteretic behavior of Ti-Nb-O alloy. This system allows arbitrary tuning of the amount of disorder by the introduction of interstitial oxygen atoms into elastically soft host lattice ͓Ti-26Nb ͑at. %͒ alloy͔, which results in the formation of randomly oriented nanometer-sized martensite as confirmed by dark-field transmission electron microscopy images. In the clean system without interstitial oxygen doping, we observe a sharp hysteresis loop with plateau region in both a stress-strain curve and a strain-temperature curve, whereas a slim hysteresis loop without plateau appears by introducing disorder. The rounding of hysteretic behavior can be understood in random-field Ising model regime, providing the possibility of a new physical picture for MT in a dirty system, where the small size of martensite homogeneously nucleates and percolates the whole system.

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Development and characterization of Ni-free Ti-base shape memory and superelastic alloys

Cited by 369 publications

References 23 publications

Mechanical properties of porous metastable beta Ti–Nb–Zr alloys for biomedical applications

Mechanical properties of porous metastable beta Ti–Nb–Zr alloys for biomedical applications

XRD and nanoindentation testing of thermo-mechanical processed Ti-29Nb-9Ta-10Zr alloy

Effect of randomness on ferroelastic transitions: Disorder-induced hysteresis loop rounding in Ti-Nb-O martensitic alloy

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