Search results for: F. Prima

Items from 1 to 20 out of 55 results

article

Martensite crystal structure in Ru-based high temperature shape memory alloys

A.M. Manzoni, G. Wallez, A. Denquin, F. Prima, more

Materials Characterization > 2018 > 142 > C > 109-114

High temperature shape memory alloys RuNb and RuTa were investigated by X-ray diffraction in order to determine the structure of the low temperature β” martensite. Powder X-ray diffraction and Rietveld analysis confirm the monoclinic symmetry and allow a precise determination of the atom positions. The low temperature microstructure is the result of a martensitic transformation from a tetragonal β′...

article

Elastically confined martensitic transformation at the nano-scale in a multifunctional titanium alloy

H.L. Wang, Y.L. Hao, S.Y. He, T. Li, more

Acta Materialia > 2017 > 135 > C > 330-339

A martensitic transformation (MT) is a typical first-order diffusionless crystal structural change with strong autocatalysis like avalanche at a speed of sound propagation. This unique characteristic, however, is undetectable in some multifunctional titanium alloys. Recently, a nano-scale elastically confined MT mechanism was proposed because a nano-scale Nb modulation in a Ti-Nb based alloy was observed...

article

SIMS as a new methodology to depth profile helium in as-implanted and annealed pure bcc metals?

S. Gorondy-Novak, F. Jomard, F. Prima, H. Lefaix-Jeuland

Nuclear Inst. and Methods in Physics Research, B > 2017 > 398 > Complete > 56-64

Reliable He profiles are highly desirable for better understanding helium behavior in materials for future nuclear applications. Recently, Secondary Ions Mass Spectrometry (SIMS) allowed the characterization of helium distribution in as-implanted metallic systems. The Cs⁺ primary ion beam coupled with CsHe⁺ molecular detector appeared to be a promising technique which overcomes the very high He ionization...

article

Tracing the coupled atomic shear and shuffle for a cubic to a hexagonal crystal transition

H.L. Wang, Y.L. Hao, S.Y. He, K. Du, more

Scripta Materialia > 2017 > 133 > C > 70-74

Tracing the rearranged atoms in the first-order phase transformation is unrealistic due to the discrete structure change. Here we report that, by tuning a nano-scale decomposition in a titanium alloy, the bcc crystal distorts successively toward the hcp crystal by keeping an orthorhombic symmetry. Thus, the shear-shuffle relationship is traced experimentally to enrich the well-known Burgers mechanism...

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Stabilizing the body centered cubic crystal in titanium alloys by a nano-scale concentration modulation

H.L. Wang, S.A.A. Shah, Y.L. Hao, F. Prima, more

Journal of Alloys and Compounds > 2017 > 700 > C > 155-158

It is well-known that the body centered cubic (bcc) crystal in titanium alloys reaches its stability limit as the electron-to-atom (e/a) ratio of the alloy drops down to ∼4.24. This critical value, however, is much higher than that of a multifunctional bcc type alloy (e/a = 4.15). Here we demonstrate that a nano-scale concentration modulation created by spinodal decomposition is what stabilizes the...

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Change in the deformation mode resulting from beta-omega compositional partitioning in a TiMo alloy: Room versus elevated temperature

S.A. Mantri, D. Choudhuri, T. Alam, V. Ageh, more

Scripta Materialia > 2017 > 130 > C > 69-73

The effect of beta-omega compositional partitioning, introduced via isothermal annealing, on the deformation behavior of a TiMo alloy was investigated via tensile testing at room and elevated temperatures. While beta with compositionally congruent athermal omega precipitates primarily exhibits twinning, after beta-omega compositional partitioning the same alloy deforms via slip. This change in deformation...

article

Texture evolution of orthorhombic α″ titanium alloy investigated by in situ X-ray diffraction

W. Elmay, S. Berveiller, E. Patoor, T. Gloriant, more

Materials Science and Engineering: A > 2017 > 679 > C > 504-510

The present paper deals with an in-situ X-ray diffraction analysis during cyclic tensile tests of a fully martensitic Ti-24Nb alloy. Texture evolution of martensite α″ phase was followed during loading-unloading cycles. Preferential formation and reverse transformation of particular martensite variants have been observed based on pole figure analysis. The occurrence of the deformation mechanisms for...

article

A β-titanium alloy with extra high strain-hardening rate: Design and mechanical properties

C. Brozek, F. Sun, P. Vermaut, Y. Millet, more

Scripta Materialia > 2016 > 114 > C > 60-64

In this paper, a new β-metastable titanium alloy, based on the Ti–Cr–Sn system, displaying both an extremely high work hardening rate and a uniform deformation larger than 0.35, was designed and successfully tested. The compositional design was guided through a stability mapping approach based on the “d-electron design method” and using an unexploited region of the Bo/Md map. Detailed analysis of...

article

Characterization of the martensitic transformation in the superelastic Ti–24Nb–4Zr–8Sn alloy by in situ synchrotron X-ray diffraction and dynamic mechanical analysis

Y. Yang, P. Castany, M. Cornen, F. Prima, more

Acta Materialia > 2015 > 88 > C > 25-33

In this work, the martensitic transformation occurring in the superelastic Ti–24Nb–4Zr–8Sn alloy was investigated by tensile tests, in situ synchrotron X-ray diffraction (SXRD) and dynamic mechanical analysis (DMA). The SXRD results clearly showed the diffraction peaks related to the α″ and β phases and their evolution, under loading and unloading conditions, have highlighted the reversible stress-induced...

article

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

P. Castany, A. Ramarolahy, F. Prima, P. Laheurte, more

Acta Materialia > 2015 > 88 > C > 102-111

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 β 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...

article

The Role of Stress Induced Martensite in Ductile Metastable Beta Ti-alloys Showing Combined TRIP/TWIP Effects

F. Sun, J.Y. Zhang, C. Brozek, M. Marteleur, more

Materials Today: Proceedings > 2015 > 2 > Supplement 3 > S505-S510

A new family of metastable beta type titanium alloys has recently been designed for ductility improvement with large strain-hardening effect. Superior plastic properties were obtained due to collective effects of both phase transformation induced plasticity and twinning induced plasticity. A series of stress induced phase transformations, including stress/strain-induced beta to omega transformation...

article

A new titanium alloy with a combination of high strength, high strain hardening and improved ductility

F. Sun, J.Y. Zhang, M. Marteleur, C. Brozek, more

Scripta Materialia > 2015 > 94 > C > 17-20

A ternary β-metastable titanium Ti–9Mo–6W (wt.%) was designed. A very high work hardening rate close to 2100MPa and a uniform deformation larger than 35% were recorded, thanks to combined transformation-induced plasticity and twinning-induced plasticity effects. In this paper, detailed microstructural analysis was performed to understand the deformation process. Various mechanisms, {332}〈113〉 mechanical...

article

Superelastic property induced by low-temperature heating of a shape memory Ti–24Nb–0.5Si biomedical alloy

A. Ramalohary, P. Castany, P. Laheurte, F. Prima, more

Scripta Materialia > 2014 > 88 > Complete > 25-28

In this study, we have explored a new way to obtain a superelastic titanium-based alloy. Contrary to the classical method, which consists of obtaining the β microstructure directly by water quenching from the high-temperature β-phase domain, this way consists of obtaining first a shape memory alloy displaying a fully α″ martensitic microstructure and then producing superelastic behavior by applying...

article

Texture investigation of the superelastic Ti–24Nb–4Zr–8Sn alloy

Y. Yang, P. Castany, M. Cornen, I. Thibon, more

Journal of Alloys and Compounds > 2014 > 591 > Complete > 85-90

In this work, the influence of crystallographic texture on mechanical properties was investigated by X-ray diffraction in the superelastic Ti–24Nb–4Zr–8Sn alloy. Different textures were obtained by changing the cold rolling reduction rate and the following thermal treatment (solution treatment or flash thermal treatment). The tensile tests performed show that Young’s modulus, elongation at rupture...

article

Improvement of Superelastic Performance of Ti-Nb Binary Alloys for Biomedical Applications

W. Elmay, E. Patoor, T. Gloriant, F. Prima, more

Journal of Materials Engineering and Performance > 2014 > 23 > 7 > 2471-2476

Recently, β-Ti-based alloys consisting of non-cytotoxic elements and possessing a low elastic modulus attracted considerable attention for biomedical applications. In addition to low elastic modulus, these alloys must also present a high strength level required to endure stresses. However, it is not easy to find a thermomechanical route in order to achieve low elastic modulus and high strength simultaneously...

article

Nanoindentation studies of TNZ and Ti2448 biomaterials after magnetoelectropolishing

T. Hryniewicz, K. Rokosz, R. Rokicki, F. Prima

Advances in Materials Science > 2014 > Vol. 14, nr 3(41) > 34--44

This work presents the nanoindentation results of two newly developed titanium alloy biomaterials, TNZ and Ti2448, after different surface treatments. The investigations were performed on the samples, AR – as received, MP – after abrasive polishing, EP – after a standard electropolshing, and MEP – after magnetoelectropolishing. The electropolishing processes, both EP and MEP, were conducted in the...

article

Nano-size protein at the surface of a Ti–Zr–Ni quasi-crystalline alloy: Fibronectin adsorption on metallic nano-composites

H. Lefaix, A. Galtayries, F. Prima, P. Marcus

Colloids and Surfaces A: Physicochemical and Engineering Aspects > 2013 > 439 > Complete > 207-214

Surface characterisation of alloys before and after their interaction with proteins allows a more rational design of biomaterials. In this work, fibronectin adsorption on a Ti-based quasicrystals-forming alloy was studied by X-ray photoelectron spectroscopy (XPS) and compared to those obtained on pure titanium substrates (cp Ti). Different fibronectin (Fn) solution concentrations were tested in interaction...

article

Investigation of early stage deformation mechanisms in a metastable β titanium alloy showing combined twinning-induced plasticity and transformation-induced plasticity effects

F. Sun, J.Y. Zhang, M. Marteleur, T. Gloriant, more

Acta Materialia > 2013 > 61 > 17 > 6406-6417

As expected from the alloy design procedure, combined twinning-induced plasticity and transformation-induced plasticity effects are activated in a metastable β Ti–12 wt.% Mo alloy. In situ synchrotron X-ray diffraction, electron backscatter diffraction and transmission electron microscopy observations were carried out to investigate the deformation mechanisms and microstructure evolution sequence...

article

Corrosion processes of Mg–Y–Nd–Zr alloys in Na2SO4 electrolyte

H. Ardelean, A. Seyeux, S. Zanna, F. Prima, more

Corrosion Science > 2013 > 73 > Complete > 196-207

The corrosion behavior of Mg–Y–Nd–Zr (WE43 commercial alloy) was investigated in Na ₂ SO ₄ electrolyte using potentiodynamic polarization curves, X-Ray Photoelectron Spectroscopy (XPS), Time-of-Flight Secondary Ion Mass Spectrometry (ToF-SIMS) depth profiles, Scanning Electron Microscopy (SEM) and Energy Dispersive X-ray Spectrometry (EDS) analyzes. SEM and EDS data show that Nd-rich...

article

Corrosion behavior of biomedical Ti–24Nb–4Zr–8Sn alloy in different simulated body solutions

Y. Bai, Y.L. Hao, S.J. Li, Y.Q. Hao, more

Materials Science & Engineering C > 2013 > 33 > 4 > 2159-2167

Corrosion behavior of a multifunctional biomedical titanium alloy Ti–24Nb–4Zr–8Sn (wt.%) in 0.9% NaCl, Hank's solution and artificial saliva at 37°C was investigated using open circuit potential, impedance spectroscopy and potentiodynamic polarization techniques, and some results were compared with pure titanium and Ti–6Al–4V alloy. The results showed that the alloy exhibited good corrosion resistance...

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Search results for: F. Prima

Martensite crystal structure in Ru-based high temperature shape memory alloys

Elastically confined martensitic transformation at the nano-scale in a multifunctional titanium alloy

SIMS as a new methodology to depth profile helium in as-implanted and annealed pure bcc metals?

Tracing the coupled atomic shear and shuffle for a cubic to a hexagonal crystal transition

Stabilizing the body centered cubic crystal in titanium alloys by a nano-scale concentration modulation

Change in the deformation mode resulting from beta-omega compositional partitioning in a TiMo alloy: Room versus elevated temperature

Texture evolution of orthorhombic α″ titanium alloy investigated by in situ X-ray diffraction

A β-titanium alloy with extra high strain-hardening rate: Design and mechanical properties

Characterization of the martensitic transformation in the superelastic Ti–24Nb–4Zr–8Sn alloy by in situ synchrotron X-ray diffraction and dynamic mechanical analysis

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

The Role of Stress Induced Martensite in Ductile Metastable Beta Ti-alloys Showing Combined TRIP/TWIP Effects

A new titanium alloy with a combination of high strength, high strain hardening and improved ductility

Superelastic property induced by low-temperature heating of a shape memory Ti–24Nb–0.5Si biomedical alloy

Texture investigation of the superelastic Ti–24Nb–4Zr–8Sn alloy

Improvement of Superelastic Performance of Ti-Nb Binary Alloys for Biomedical Applications

Nanoindentation studies of TNZ and Ti2448 biomaterials after magnetoelectropolishing

Nano-size protein at the surface of a Ti–Zr–Ni quasi-crystalline alloy: Fibronectin adsorption on metallic nano-composites

Investigation of early stage deformation mechanisms in a metastable β titanium alloy showing combined twinning-induced plasticity and transformation-induced plasticity effects

Corrosion processes of Mg–Y–Nd–Zr alloys in Na2SO4 electrolyte

Corrosion behavior of biomedical Ti–24Nb–4Zr–8Sn alloy in different simulated body solutions

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