Change in Structure During Consolidation of Calcium Hydride Powders of TiNi Intermetallic

Kasimtsev, A. V.; Маркова, Г. В.; Shuitsev, A. V.; Levinskii, Yu. V.; Свиридова, Т. А.; Алпатов, А. В.

doi:10.1007/s11015-015-0037-1

Cited by 9 publications

(4 citation statements)

References 4 publications

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“…Therefore, this powder is likely to be a good candidate for the following sintering or hot isostatic pressing (the details are seen in [15]). The other batches can also be used in the fabrication of special materials…”

Section: Resultsmentioning

confidence: 99%

Characterization of Nitinol Powder Produced by Reduction of Oxides by Calcium Hydride

et al. 2015

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Several techniques were used to investigate the chemical and phase composition of four trial batches of nitinol powder produced by calciothermic reduction as well as their morphology and granulometric composition. Almost all powders produced by a similar procedure contained an allowable amount of impurities and were practically free of minor detrimental phases such as Ti2Ni and Ni3Ti. The powders under study have gamma or lognormal particle size distributions and spongy particles morphology typical of this production method. The tap density over 3 g/cm 3 was achieved at least in one case, which gives us an opportunity to successfully produce bulk articles by subsequent treatments such as sintering or hot isostatic pressing.

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Section: Resultsmentioning

confidence: 99%

Characterization of Nitinol Powder Produced by Reduction of Oxides by Calcium Hydride

et al. 2015

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“…To prepare samples with combined porous-monolithic structure, monolithic plates and TiNi powder, prepared via the calcium hydride approach [37][38][39][40][41], were used.…”

Section: Materials Preparationmentioning

confidence: 99%

Combined Porous-Monolithic TiNi Materials Surface-Modified with Electron Beam for New-Generation Rib Endoprostheses

Shabalina

Аникеев

Kulinich

et al. 2023

JFB

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TiNi alloys are very widely used materials in implant fabrication. When applied in rib replacement, they are required to be manufactured as combined porous-monolithic structures, ideally with a thin, porous part well-adhered to its monolithic substrate. Additionally, good biocompatibility, high corrosion resistance and mechanical durability are also highly demanded. So far, all these parameters have not been achieved in one material, which is why an active search in the field is still underway. In the present study, we prepared new porous-monolithic TiNi materials by sintering a TiNi powder (0–100 µm) on monolithic TiNi plates, followed by surface modification with a high-current pulsed electron beam. The obtained materials were evaluated by a set of surface and phase analysis methods, after which their corrosion resistance and biocompatibility (hemolysis, cytotoxicity, and cell viability) were evaluated. Finally, cell growth tests were conducted. In comparison with flat TiNi monoliths, the newly developed materials were found to have better corrosion resistance, also demonstrating good biocompatibility and potential for cell growth on their surface. Thus, the newly developed porous-on-monolith TiNi materials with different surface porosity and morphology showed promise as potential new-generation implants for use in rib endoprostheses.

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“…In other locations, a mixed-type topography of the fracture surface is also observed, consisting of cellular and lamellar martensitic topographies (Figure 6b). According to previous research [47][48][49][50], along with the B2 phase, the initial powder contains martensite phase B19 . Additionally, the investigation of the structural-phase composition of porous TiNi alloys, obtained by sintering in the present research, also shows the presence of austenitic and martensite phases (see Figure 2a).…”

Section: Fractograms Of the Fracture Surface Of Porous Tini-based All...mentioning

confidence: 99%

The Effect of Cobalt on the Deformation Behaviour of a Porous TiNi-Based Alloy Obtained by Sintering

et al. 2021

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This research investigates the effect of cobalt on the deformation behaviour of a porous TiNi-based alloy that was obtained by sintering. Porous TiNi-based alloys with cobalt additives, accounting for 0–2 at. % and with a pitch of 0.5, were obtained. The structural-phase state of the porous material was researched by X-ray structural analysis. The effect of different amounts of Co (used as an alloying additive) on the deformation behaviour was investigated by tensile to fracture. The fractograms of fracture of the experimental samples were analysed using scanning electron microscopy. For the first time, the present research shows a diagram of the deformation of a porous TiNi-based alloy that was obtained by sintering under tensile. The stages of deformation were described according to the physical nature of the processes taking place. The effect of the cobalt-alloying additive on the change in the critical stress of martensitic shear was investigated. It was found that the behaviour of the concentration dependency of stress at concentrations under 1.5 at. % Co was determined by an increase in the stress in the TiNi solid solution. This phenomenon is attributed to the arrangement of Co atoms on the Ti sublattice, as well as an increase in the fraction of the B19′ phase in the matrix. The steep rise of the developed forces on the concentration dependency of the martensitic shear stress at 2 at. % Co is presumably attributed to the precipitation hardening of austenite due to the precipitation of finely dispersed coherent Ti3Ni4 phase following the decrease of fraction of martensite. An analysis of fractograms showed that as more cobalt was added, areas of fracture with traces of martensite plates of the B19′ phase started to prevail. At 2 at. % Co these plates fill almost the entire area of the fracture. The research findings presented in this work are of great importance, since they can be used to achieve the set of physical and mechanical properties required for the development of biocompatible materials for implantology.

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Change in Structure During Consolidation of Calcium Hydride Powders of TiNi Intermetallic

Cited by 9 publications

References 4 publications

Characterization of Nitinol Powder Produced by Reduction of Oxides by Calcium Hydride

Characterization of Nitinol Powder Produced by Reduction of Oxides by Calcium Hydride

Combined Porous-Monolithic TiNi Materials Surface-Modified with Electron Beam for New-Generation Rib Endoprostheses

The Effect of Cobalt on the Deformation Behaviour of a Porous TiNi-Based Alloy Obtained by Sintering

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