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Articoli di riviste sul tema "Polycrystalline Ni-Ti"

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Autore: Grafiati

Pubblicato: 8 giugno 2024

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1

Liu, Y., J. Hu, Y. Zhang e Z. Guo. "Interface microstructure of the brazed zirconia and Ti-6Al-4V using Ti-based amorphous filler". Science of Sintering 45, n. 3 (2013): 313–21. http://dx.doi.org/10.2298/sos1303313l.

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The polycrystalline ZrO2?3mol.%Y2O3 was brazed to Ti-6Al-4V using a Ti47Zr28Cu14Ni11 (at.%) amorphous ribbon at 1123 K in a high vacuum. The microstructure of the interface and evolution mechanism of the joint was investigated. The experimental result showed that the typical interfacial microstructures of the joints consisted of ZrO2/TiO+TiO2+Cu2Ti4O+Ni2Ti4O/?-Ti+(Ti,Zr)2(Cu,Ni) eutectic/(Ti,Zr)2(Cu,Ni)/acicular Widmanst?ten structure/Ti-6Al-4V alloy. The microstructure of the brazed joint was related to the solution and chemical reaction among atoms during brazing. According to the mechanical property tests the joint brazed at 1123 K for 30 min obtained the maximum shear strength 63 MPa. Both the white block intermetallic compound (Ti,Zr)2(Cu,Ni) and the coarse ?-Ti+(Ti,Zr)2(Cu,Ni) eutectic structure should be avoided forming in the brazed joint.

2

Kim, J., Y. C. Choi, Hyoung Seop Kim e Sun Ig Hong. "Biocompatibility and Mechanical Performance of Ni-Ti". Materials Science Forum 534-536 (gennaio 2007): 1617–20. http://dx.doi.org/10.4028/www.scientific.net/msf.534-536.1617.

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Biomimetic apatite deposition behaviors and mechanical performance for as-rolled and annealed Ni-Ti plates were investigated. Apatite nucleation and growth on Ni-Ti in SBF (simulated body fluid) was not appreciably influenced by heat treatment. But, the apatite deposition rate increased slightly by NaOH surface treatment. The nodular apatite on the deposited layer is favored on a macro-scale since the surface energy of polycrystalline apatite particles can be reduced by forming nodules. The weight gain after apatite deposition for Ni-Ti (0.004 g/cm2) after 10 days were found to be smaller that that of NaOH treated Ti-6Al-4V, but it was comparable to that of non- NaOH-treated Ti-6Al-4V (0.004 g/cm2). The stress-strain responses of annealed Ni-Ti displayed the pseudoelastic behavior associated with stress-induced martensite formation with the transition stress for the martensite formation equal to 320 MPa. On the other hand the cold worked Ni-Ti displayed no appreciable pseudoelastic region and the yield stress was ~500MPa. A good biomimetic apatite formation and excellent mechanical performance of Ni-Ti suggests that Ni-Ti can be an excellent candidate material for orthopedic implants.

3

Liu, Binbin, Zhu Zhu, Caiyun Liu, Yao Wang e Feng Ye. "Effect of Inserted Ti Layers on the Phase Transformation of Al/Ni Multilayer Foils". Coatings 12, n. 4 (26 marzo 2022): 453. http://dx.doi.org/10.3390/coatings12040453.

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The thin Ti layers were inserted in the interfaces of base Al/Ni multilayer foils to form the Al/Ti/Ni/Ti (ATNT) foils through magnetron deposition. Al and Ni were determined in the as-deposited foils, while the absence of Ti was due to the strongly textured polycrystalline structure. TEM analysis implied an asymmetric interface structure between the Ni/Ti/Al interfaces and Al/Ti/Ni interfaces. After annealing at 473 K and 573 K for 3 h, the phase composition was the same as the initial state, which changed to be Al3Ni2, Ni3(AlTi), Ni and a small amount of Al3Ti when the treating temperature reached 673 K. Further increasing the annealing temperature to 773 K and 873 K leads to the appearance of stable AlNi. The obtained results implied that the inserted Ti layers impeded atomic interdiffusion and the formation of Al3Ni at the early stage, but had less impact on the final products. This further indicated that adding the inserted transition layer provides a reference to balance the storage stability and reaction performance of Al/Ni foils with regard to the applications.

4

Hannequart, Philippe, Michaël Peigney e Jean-François Caron. "A micromechanics-based model for polycrystalline Ni–Ti wires". Smart Materials and Structures 28, n. 8 (23 luglio 2019): 085040. http://dx.doi.org/10.1088/1361-665x/ab2b50.

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5

Liu, Dan Dan, Jochen Fiebig, Martin Peterlechner, Simon Trubel, Matthias Wegner, Yong Du, Zhan Peng Jin, Gerhard Wilde e S. Divinsky. "Ti and Ni Grain Boundary Diffusion in B2 NiTi Compound". Defect and Diffusion Forum 363 (maggio 2015): 137–41. http://dx.doi.org/10.4028/www.scientific.net/ddf.363.137.

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The radiotracer technique was used to measure the grain boundary diffusion of44Ti and63Ni in slightly Ni-rich polycrystalline NiTi compound in the temperature range of 673 - 923 K. The temperature dependence of the grain boundary triple productP(P=sδDgb,sis the segregation coefficient,δis the grain boundary width, andDgbis the grain boundary diffusion coefficient) for Ti and Ni was determined. The triple products of both Ti and Ni grain boundary diffusion in NiTi reveal a unique behavior with significant deviations from an Arrhenius-type dependence. Probable evolution of the grain boundary structure with temperature was used to interpret this phenomenon.

6

Titenko, Anatoliy N., e Lesya D. Demchenko. "Superelastic Deformation in Polycrystalline Fe-Ni-Co-Ti-Cu Alloys". Journal of Materials Engineering and Performance 21, n. 12 (2 ottobre 2012): 2525–29. http://dx.doi.org/10.1007/s11665-012-0406-x.

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7

Rakitin, V. V., L. S. Feoktistova, M. V. Gapanovich, A. V. Stanchik e D. M. Sedlovets. "STUDY OF ELECTROCHEMICAL SYNTHESIS FEATURES OF CNTS THIN FILMS ON TITANIUM AND TANTALUM FOIL SUBSTRATES". Электрохимия 59, n. 12 (1 dicembre 2023): 884–93. http://dx.doi.org/10.31857/s0424857023120101.

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The features of electrochemical deposition of copper layer on titanium and tantalum flexible substrates, as well as modes of sequential electrochemical deposition of tin layer on Cu/Ti and Cu/Ta and nickel layer on Sn/Cu/Ti and Sn/Cu/Ta from corresponding electrolyte solutions were studied by cyclic voltammetry. Deposition potentials for each metal layer were determined taking into account the type of substrate, and a wide set of the Cu-Sn-Ni/Ti and Cu-Sn-Ni/Ta stable precursor films were synthesized. The stage of annealing in an active sulfur atmosphere (sulfurization) has been optimized in order to obtain the Cu2NiSnS4 stable compounds. Based on the obtained XRD and Raman spectroscopy data, it was found that annealing in active sulfur atmosphere at 550 °C for 60 minutes is necessary to synthesize the Cu2NiSnS4 stable single-phase compounds with polycrystalline structure on Ta and Ti substrates

8

Date, Hidefumi. "Effect of Strain Rates on the Transformation Behavior of Ni-Ti Alloy". Materials Science Forum 539-543 (marzo 2007): 3231–36. http://dx.doi.org/10.4028/www.scientific.net/msf.539-543.3231.

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In order to clarify the effect of strain rates on phase transformation behaviors of Ni-Ti alloy, a compressive test using a cylindrical specimen of polycrystalline Ni-Ti alloy of Ti-50.69 at% Ni was carried out at a high strain rate and a low strain rate. The transformation temperatures were determined by a differential scanning calorimeter (DSC) using a sample cut from a compressed specimen. The transformation temperatures of the specimens before deformation were Ms= 303 K, Mf = 287 K, As = 297 K and Af = 319 K, respectively. The compressive test was carried out using specimen heated from liquid nitrogen temperature to room temperature. A universal testing machine as a static test apparatus and a Split Hopkinson Bar apparatus for a dynamic test were used. The specimen had a reoriented martensite phase after deformation because the superelastic effect was not observed upon unloading. Two reverse transformations during heating and a forward transformation during cooling were observed by DSC measurement. The first reverse transformation corresponds to that of thermal-induced martensite by immersion in liquid nitrogen and the second reverse transformation corresponds to that of reoriented martensite with slips in a polycrystalline matrix introduced by plastic deformation. The reverse transformation of the martensite phase with a slip exhibited strong strain rate dependency. Plastic strains and strain rate had strong influence on the shape recovery. The interaction between the temperature elevation by a conversion of plastic work and slip generated by dynamic plastic deformation is a complicated problem.

9

Yamamoto, Takaei, Akihiko Suzuki, Hiroki Cho e Toshio Sakuma. "Transformation Behavior of Shape Memory Alloys in Multiaxial Stress State". Advances in Science and Technology 78 (settembre 2012): 46–51. http://dx.doi.org/10.4028/www.scientific.net/ast.78.46.

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The transformation behavior of shape memory alloys is simulated for complex loadings of stress, strain and temperature. Calculations are made by using the “Accommodation Model” which is a constitutive model for shape memory alloys considering the accommodation behavior of the transformation strain. Calculated results are presented for the transformation behavior in the axial and shear stress state. These results are compared with those obtained by the experiment where tube specimens of the Ti-Ni shape memory alloy are subjected to the axial and torsion loading. The proposed constitutive model can predict the transformation behavior including the plastic strain effect of polycrystalline Ti-Ni shape memory alloys under non-proportional multiaxial loading condition.

10

Sultana, Najmin Ara, Manish Ojha, Aiman H. Al-Allaq, Yousuf S. Mohammed, Tilda Pendleton, Helmut Baumgart e Abdelmageed Elmustafa. "Impacts of E-Beam Irradiation on Polycrystalline Metals in Both Bulk and Thin Film Forms". ECS Meeting Abstracts MA2023-02, n. 19 (22 dicembre 2023): 3329. http://dx.doi.org/10.1149/ma2023-02193329mtgabs.

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This study aims to explore the impact of e-beam irradiation on the mechanical and structural characteristics of four different polycrystalline metals (Ni, Cr, V, and Ti), in both bulk and thin film forms. Thin metal films are fabricated using magnetron sputtering. The primary goal is to identify suitable metal candidates for growing thin films, which could serve as exit windows for e-beam accelerators. This selection is based on their properties, power dissipation capabilities, and the effects of irradiation on mechanical attributes such as hardness, ductility, defect density, and strength. For the bulk polycrystalline metal samples, a series of nanoindentation tests has been conducted before and after e-beam irradiation to investigate changes in hardness and elastic modulus. Additionally, to compare performance with the bulk samples, thin metal films are subjected to the same procedure before and after irradiation, allowing for the evaluation of film hardness, moduli, and creep properties. Results indicate that irradiated bulk samples of Ni, Cr, and V become harder, whereas Ti experiences softening. There is no significant irradiation effect on modulus for all for polycrystalline metal samples. To understand the underlying reasons behind these effects, both the fabricated metal films and bulk metal samples undergo comprehensive characterization tests for their microstructural properties, elastic behavior, and chemical composition. This involves the utilization of SEM with EDS, FESEM and AFM to analyze microstructure and surface attributes of the films, followed by X-ray diffraction to gain insight into film morphology and lattice orientation.

11

Protsenko, I. Yu, O. V. Shovkoplyas, Yu M. Ovcharenko e N. M. Opanasyuk. "The electrophysical properties of thin polycrystalline Cr, Cu, Ni and Ti films". Journal of Physical Studies 2, n. 1 (1998): 105–8. http://dx.doi.org/10.30970/jps.02.105.

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12

Marciszko, Marianna, Andrzej Baczmański, Mirosław Wróbel, Wilfrid Seiler, Chedly Braham e Krzysztof Wierzbanowski. "Different Grain Interaction Models Used for Interpretation of Lattice Strain Data Collected Using Grazing Incidence X-Ray Diffraction". Materials Science Forum 768-769 (settembre 2013): 26–30. http://dx.doi.org/10.4028/www.scientific.net/msf.768-769.26.

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Multireflection grazing incidence X-ray diffraction (MGIXD) was applied to measure residual stresses in thin surface layers and the problem of X-ray elastic constants (XEC) used for the interpretation of results was studied. To show the influence of the X-ray elastic constants on the interpretation of MGIDX results, polycrystalline materials having low (Ti alloy) and high elastic anisotropy of crystallites (Ni alloy) were investigated.

13

Cao, Shan Shan, Minoru Nishida e Dominique Schryvers. "FIB/SEM Applied to Quantitative 3D Analysis of Precipitates in Ni-Ti". Solid State Phenomena 172-174 (giugno 2011): 1284–89. http://dx.doi.org/10.4028/www.scientific.net/ssp.172-174.1284.

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Ni4Ti3 precipitates with a heterogeneous distribution growing in a polycrystalline Ni50.8Ti49.2 alloy have been investigated in a Dual-Beam FIB/SEM system. The volume ratio, mean volume, central plane diameter, thickness, aspect ratio and sphericity of the precipitates in the grain interior as well as near to the grain boundary were measured or calculated. The morphology of the precipitates was classified according to the Zingg scheme. The multistage martensitic transformation occurring in these kinds of samples is interpreted in view of the data of this heterogeneous microstructure of matrix and precipitates.

14

Hollanders, Mark A., Caroline G. Duterloo, Barend J. Thijsse e Eric J. Mittemeijer. "Interdiffusion reactions in Ni/Ta multilayers studied by x-ray diffraction". Journal of Materials Research 6, n. 9 (settembre 1991): 1862–73. http://dx.doi.org/10.1557/jmr.1991.1862.

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Diffusion-induced phase transformations were studied in Ni/β-Ta multilayers between 523 K and 823 K, primarily using x-ray diffraction. The multilayers had a modulation length, A, of 20.3 nm and a composition of Ni48Ta52. They were polycrystalline without coherency between the Ni and Ta sublayers. Upon annealing at relatively low temperatures (up to 723 K) Ta dissolved in crystalline Ni, concurrently with the formation of an amorphous phase. The interdiffusion reactions did not take place only at the Ni/Ta interfaces, but also along the grain boundaries in the sublayers. The chemical diffusion coefficient in the amorphous phase was determined at 673 K, using a previously developed method. The results were compared with experiments on Ni/Ti multilayers, which show similar reactions. At 723 K and higher temperatures the fcc (Ni, Ta) solid solution transformed into the stable Ni3Ta compound.

15

SINHA, ARIJIT, SHUBHABRATA DATTA e PARTHA PROTIM CHATTOPADHYAY. "STUDY OF NANOMECHANICAL PROPERTIES OF Ni-Ti SHAPE MEMORY ALLOY BY INSTRUMENTED INDENTATION TECHNIQUE". International Journal of Nanoscience 10, n. 04n05 (agosto 2011): 955–59. http://dx.doi.org/10.1142/s0219581x1100871x.

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An attempt has been made to correlate shape memory behavior and the micromechanical characteristics of the martensite crystals in the polycrystalline microstructure of thermally and thermomechanically processed nearly equi-atomic Ni–Ti shape memory alloy. The nanoindentation measurements have shown that suitable schedule of thermo mechanical treatment improves the hardness of the martensite phase. The recovery index parameter (η) obtained from the load–depth profile illustrates the recovery of the indentation strain of the martensite phase.

16

Butler, B. D., B. C. Murray, D. G. Reichel e A. D. Krawitz. "Elastic Constants of Alloys Measured with Neutron Diffraction". Advances in X-ray Analysis 32 (1988): 389–95. http://dx.doi.org/10.1154/s0376030800020693.

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AbstractElastic constants as a function of crystallographic direction have been measured in polycrystalline alloy samples of 17-4PH stainless steel, Ni-Cr-Fe, and Ti-6%AI-4%V using a neutron diffraction technique. The results compare best with the constant stress model of Reuss. It is demonstrated that measurements of stress can be made sampling the bulk of the material using neutrons with an accuracy comparable to more conventional x-ray methods.

17

Kaneno, Yasuyuki, e Takayuki Takasugi. "The Effects of Nb and Cr Addition on Mechanical and Chemical Properties of Cold-Rolled Ni₃(Si,Ti) Intermetallic Foils". Materials Science Forum 561-565 (ottobre 2007): 411–14. http://dx.doi.org/10.4028/www.scientific.net/msf.561-565.411.

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Nb and/or Cr added Ni3(Si,Ti) as well as unalloyed Ni3(Si,Ti) intermetallic thin foils (i.e., Ni3(Si,Ti), Ni3(Si,Ti)+Nb, Ni3(Si,Ti)+Cr and Ni3(Si,Ti)+Nb,Cr) were fabricated from arc-melted polycrystalline ingots by thermomechanical process and subsequent heavy cold-rolling. Tensile property at room temperature as well as at high temperature and oxidization behavior of the cold-rolled foils with a thickness of ~200μm were investigated. The Ni3(Si,Ti) and Ni3(Si,Ti)+Nb alloys showed a single-phase microstructure consisting of L12 phase, while the Ni3(Si,Ti)+Cr and Ni3(Si,Ti)+Nb,Cr alloys exhibited a two-phase microstructure with A1 (fcc) Ni solid solution phase within the L12 grains. All the cold-rolled foils showed high tensile strength (over 2GPa) at room temperature although no plastic elongation was observed. The addition of Nb and/or Cr slightly enhanced the room-temperature tensile strength of the Ni3(Si,Ti) alloy. On the other hand, the addition of Nb and/or Cr prominently enhanced high-temperature tensile strength as well as oxidization resistance, while the addition of Cr improved high-temperature elongation.

18

Lee, Doyup, Toshihiro Omori e Ryosuke Kainuma. "Ductility enhancement and superelasticity in Fe–Ni–Co–Al–Ti–B polycrystalline alloy". Journal of Alloys and Compounds 617 (dicembre 2014): 120–23. http://dx.doi.org/10.1016/j.jallcom.2014.07.136.

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19

Kim, Yanghoo, Min-Gu Jo, Ju-Won Park, Hyung-Ki Park e Heung Nam Han. "Elastocaloric effect in polycrystalline Ni 50 Ti 45.3 V 4.7 shape memory alloy". Scripta Materialia 144 (febbraio 2018): 48–51. http://dx.doi.org/10.1016/j.scriptamat.2017.09.048.

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20

Bouhki, M., A. Bruson e P. Guilmin. "X-ray diffraction study of amorphization along interfaces in polycrystalline Ni/Ti multilayers". Solid State Communications 83, n. 1 (luglio 1992): 5–9. http://dx.doi.org/10.1016/0038-1098(92)90003-r.

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21

Thamburaja, P., H. Pan e F. S. Chau. "Martensitic reorientation and shape-memory effect in initially textured polycrystalline Ti–Ni sheet". Acta Materialia 53, n. 14 (agosto 2005): 3821–31. http://dx.doi.org/10.1016/j.actamat.2005.03.054.

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22

Chernogor, A. V., I. V. Blinkov, D. S. Belov, V. S. Sergevnin e A. P. Demirov. "The influence of Ni on the composition, structure and properties of Ti-Cr-N coatings". Powder Metallurgy аnd Functional Coatings, n. 1 (15 marzo 2023): 63–74. http://dx.doi.org/10.17073/1997-308x-2023-1-63-74.

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The influence of nickel on the structure and properties of Ti-Cr-N ion-plasma coatings obtained by arc-PVD method has been studied. With a nickel content of up to 11.9 at. %, the coating consists of Cr2N, Ti1 – xCrxN, and metallic Ni. Upon further increase in Ni concentration in the coating, intermetallic compound Ni3Ti is formed. The structure of the coatings was studied using the transmission electron microscopy. The coatings of Ti-Cr-N system are characterized by a columnar structure, in the columns of which Ti1 - xCrxN and Ti1 - yCryN (x > y) sublayers, being several nanometers thick and containing variable concentration of titanium and chromium, as well as Cr2N sublayers of about 25 nm are formed due to the complete solubility of TiN and Cr2N and the planetary rotation of the substrates, resulting in layer-by-layer stacking of the components of the evaporated cathodes. This structure remains intact in coatings of Ti-Cr-N-Ni system with a low nickel concentration (on the order of tenths of at. %). However, upon that, the column size refinement and an increase in biaxial compressive stresses from 6.7 to 9.7 GPa are observed, which results in an increase in hardness from 30 to 42 GPa. The coatings with a high nickel content are characterized by a multilayer architecture with an equiaxed polycrystalline structure of nanograins in layers. As Ni concentration increases, the hardness of the coating decreases to 16.7 GPa, which is associated with an increase in the fraction of relatively soft nickel in the coating and a decrease in macrostresses to -0.6 GPa. Upon that, the wear intensity increases from 3·10-15 to 5·10-15 m3/(N·m). The studied coatings of Ti–Cr–N and Ti–Cr–N–Ni systems are resistant to adhesive and cohesive destruction. With an increase in the nickel content upon measuring scratching, the destruction of the coatings occurs exclusively due to the plastic deformation.

23

Choi, Baig Gyu, In Soo Kim, Doo Hyun Kim e Chang Yong Jo. "MC Carbide Decomposition during Thermal Exposure of Polycrystalline Ni-Base Superalloys". Solid State Phenomena 124-126 (giugno 2007): 1505–8. http://dx.doi.org/10.4028/www.scientific.net/ssp.124-126.1505.

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MC decompositions during thermal exposure have been investigated in three conventional cast Ni-base superalloys, GTD111, IN738LC, and CM247LC. MC decomposition in GTD111 and IN738LC depends on exposure temperature. While MC decomposed into M23C6 at 982°C, η formed from MC after exposure at 927°C and 871°C. Ta and Ti separated from MC during thermal exposure made η phase to form instead of γ'. The decomposition of the MC in CM247LC depends on their morphology and position. Segregation during casting process affected the morphology and composition of MC type carbide in this alloy. Acicular M6C was found near scriptal MC in the dendrite. Blocky MC near γ-γ' eutectic decomposed into M23C6. Both M23C6 and M6C can be found on grain boundary after thermal exposure in CM247LC.

24

Lee, Doyup, Toshihiro Omori, Kwangsik Han, Yasuyuki Hayakawa e Ryosuke Kainuma. "Texture Formation in a Polycrystalline Fe–Ni–Co–Al–Ti–B Shape Memory Alloy". ISIJ International 60, n. 12 (15 dicembre 2020): 2973–82. http://dx.doi.org/10.2355/isijinternational.isijint-2020-199.

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Jones, N. G., K. A. Christofidou, P. M. Mignanelli, J. P. Minshull, M. C. Hardy e H. J. Stone. "Influence of elevated Co and Ti levels on polycrystalline powder processed Ni-base superalloy". Materials Science and Technology 30, n. 15 (3 febbraio 2014): 1853–61. http://dx.doi.org/10.1179/1743284714y.0000000509.

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Panin, V. E., Ye Ye Deryugin, L. S. Derevyagina, A. I. Lotkov e B. I. Suvorov. "Plastic deformation and fracture of polycrystalline Ni–Ti with stress concentrators of different scales". Theoretical and Applied Fracture Mechanics 30, n. 1 (settembre 1998): 19–26. http://dx.doi.org/10.1016/s0167-8442(98)00040-8.

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27

Cao, S., M. Nishida e D. Schryvers. "Quantitative three-dimensional analysis of Ni4Ti3 precipitate morphology and distribution in polycrystalline Ni–Ti". Acta Materialia 59, n. 4 (febbraio 2011): 1780–89. http://dx.doi.org/10.1016/j.actamat.2010.11.044.

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Hao, Ya Nan, Xiao Hui Wang e Long Tu Li. "Influence of Reaction Time on Properties of BaTiO₃ Coated Ni Nanoparticles by a Novel Sol-Precipitation Method". Key Engineering Materials 602-603 (marzo 2014): 1060–64. http://dx.doi.org/10.4028/www.scientific.net/kem.602-603.1060.

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Uniform BaTiO3 polycrystalline coating layer on Ni nanoparticles is achieved by a novel sol-precipitation method. The Fourier transform infrared spectra (FT-IR) of the coated samples inhibit that there is typical Ba-O and Ti-O bond for crystalline BaTiO3.The influence of reaction time on the properties of the coated samples is investigated. It is found that the coating layer contains less BaCO3 impurity and crystallizes more completely along with the increase of the reaction time. Moreover, the anti-oxidation properties of these samples are significantly improved.

29

Gaag, Tobias, Nils Ritter, Alexandra Peters, Nicklas Volz, Daniel Gruber, Steffen Neumeier, Christopher Zenk e Carolin Körner. "Improving the Effectiveness of the Solid-Solution-Strengthening Elements Mo, Re, Ru and W in Single-Crystalline Nickel-Based Superalloys". Metals 11, n. 11 (26 ottobre 2021): 1707. http://dx.doi.org/10.3390/met11111707.

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Tailoring the partitioning behavior of solid solution strengtheners is a crucial design strategy for advanced Ni-based superalloys. The goal of this study was to maximize the enrichment of Mo, Re, Ru and W in the γ-matrix phase. To determine the composition dependency of the partitioning behavior, a set of polycrystalline superalloys with varying contents of these solid solution-strengthening elements and a W-containing single-crystalline alloy series with varying concentrations of the γ′-forming elements Ta and Ti was produced. Assessed properties include phase compositions by electron-probe micro-analysis, phase transformation temperatures by differential scanning calorimetry and creep behavior. Re exhibits the most pronounced enrichment in the γ-matrix, followed by Mo, Ru and W. Due to the preference of the Al-sites in the γ′-phase in the order Ta > Ti > W > Mo > Re, the solid solution strengthening elements Mo, Re and W are displaced from the γ′-phase by increasing Ti and Ta contents. The investigated solutes do not directly influence the partitioning behavior of Ru as it prefers Ni-sites in the γ′-phase. Compressive creep experiments reveal a correlation between the content of solid solution strengtheners in the γ-phase and creep performance.

30

Al-Zoubi, Noura. "Elastic Parameters of Paramagnetic Fe–20Cr–20Ni-Based Alloys: A First-Principles Study". Metals 9, n. 7 (17 luglio 2019): 792. http://dx.doi.org/10.3390/met9070792.

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The single-crystal and polycrystalline elastic parameters of paramagnetic Fe0.6−xCr0.2Ni0.2Mx (M = Al, Co, Cu, Mo, Nb, Ti, V, and W; 0 ≤ x ≤ 0.08) alloys in the face-centered cubic (fcc) phase were derived by first-principles electronic structure calculations using the exact muffin-tin orbitals method. The disordered local magnetic moment approach was used to model the paramagnetic phase. The theoretical elastic parameters of the present Fe–Cr–Ni-based random alloys agree with the available experimental data. In general, we found that all alloying elements have a significant effect on the elastic properties of Fe–Cr–Ni alloy, and the most significant effect was found for Co. A correlation between the tetragonal shear elastic constant C′ and the structural energy difference ΔE between fcc and bcc lattices was demonstrated. For all alloys, small changes in the Poisson’s ratio were obtained. We investigated the brittle/ductile transitions formulated by the Pugh ratio. We demonstrate that Al, Cu, Mo, Nb, Ti, V, and W dopants enhance the ductility of the Fe–Cr–Ni system, while Co reduces it. The present theoretical data can be used as a starting point for modeling the mechanical properties of austenitic stainless steels at low temperatures.

31

Jibaly, Mohammed, Alex Weiss, A. R. Koymen, D. Mehl, L. Stiborek e C. Lei. "Measurement of the positron work functions of polycrystalline Fe, Mo, Ni, Pt, Ti, and V". Physical Review B 44, n. 22 (1 dicembre 1991): 12166–71. http://dx.doi.org/10.1103/physrevb.44.12166.

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32

Jacobus, Kurt, Huseyin Sehitoglu e Mark Balzer. "Effect of stress state on the stress-induced martensitic transformation in polycrystalline Ni-Ti alloy". Metallurgical and Materials Transactions A 27, n. 10 (ottobre 1996): 3066–73. http://dx.doi.org/10.1007/bf02663855.

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33

Cao, X., Xiao Min Li, Wei Dong Yu, Rui Yang e Xin Jun Liu. "Fabrication and Resistance-Switching Behaviors of NiO Thin Films by Thermal Oxidation of Evaporated Ni Films". Advanced Materials Research 66 (aprile 2009): 131–34. http://dx.doi.org/10.4028/www.scientific.net/amr.66.131.

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Abstract (sommario):

Polycrystalline NiO thin films were fabricated on Pt (111)/Ti/SiO2/Si substrates by thermal oxidation of the evaporated Ni films. Pt/NiO/Pt structures were prepared, and they showed reversible resistance switching behaviors. When the compliance set current was varied from 5 mA to 40 mA, the on-state currents increased, while the on-state resistances decreased. It is probably attributed to higher current compliance resulted in the formation of stronger and less resistive filaments, which in turn need more energy and power for their rupture. The resistive switching in NiO thin films is closely related to the formation and rupture of conducting filaments.

34

Daniel Whittenberger, J., R. K. Viswanadham, S. K. Mannan e K. S. Kumar. "1200 to 1400 K slow strain rate compressive behavior of small grain size NiAl/Ni2AlTi alloys and NiAl/Ni2AlTi–TiB2 composites". Journal of Materials Research 4, n. 5 (ottobre 1989): 1164–71. http://dx.doi.org/10.1557/jmr.1989.1164.

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Abstract (sommario):

Since 1976 NiAl–Ni2AlTi alloys have been known to possess elevated temperature mechanical properties approaching those of Ni-base superalloys; however, due to their apparent brittleness, little additional work has been undertaken to exploit this strength. In an attempt to instill ductility in these materials, small grain size single (Ni–45Al–5Ti) and two (Ni–40Al–10Ti) phase intermetallics were fabricated by XDTM technology and tested (XDTM is a trademark of Martin Marietta Corporation). As these compositions have the potential for being the matrix material in high temperature composites, Ni–40Al–10Ti and Ni–45Al–5Ti with 20 vol.% TiB2 in the form of ∼1 μm diameter particles were also investigated. The as-fabricated materials were fully dense and polycrystalline. The grain sizes measured ∼8 μm for Ti-poor and about 15 μm for the Ti-rich unreinforced materials but could not be determined for either TiB2 containing composite. Elevated temperature compression testing was conducted to about 8% deformation between 1200 and 1400 K with strain rates varying from ∼10−4 to ∼10−7 s−1. The majority of the tests exhibited diffuse yielding over approximately 1% strain followed by negative strain hardening. However, a few experiments resulted in steady state behavior where deformation continued under a constant stress. The flow strengths on yielding of both forms of Ni–40Al–10Ti were higher than those for the Ni–45Al–5Ti versions. For each matrix composition the addition of 20 vol.% TiB2 decreased the strength at the higher strain rates in comparison to the TiB2-free forms. During slow deformation conditions, however, the particles do provide reinforcement. Light optical microscopy of tested specimens revealed that these materials are generally quite brittle as numerous longitudinal and transverse cracks were found irrespective of the type of stress-strain behavior.

35

DAI, XIU HONG, HONG DONG ZHAO, LEI ZHANG, HUI JUAN ZHU, XIAO HONG LI, YA JUN ZHAO, JIAN XIN GUO et al. "INVESTIGATION OF LEAKAGE CURRENT BEHAVIOR OF Pt/Bi0.975La0.025Fe0.975Ni0.025O3/Pt CAPACITOR MEASURED AT DIFFERENT TEMPERATURES". Surface Review and Letters 21, n. 02 (aprile 2014): 1450029. http://dx.doi.org/10.1142/s0218625x14500292.

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Abstract (sommario):

Polycrystalline Bi 0.975 La 0.025 Fe 0.975 Ni 0.025 O 3 (BLFNO) film is fabricated on Pt / Ti / SiO 2/ Si (111) substrate by sol–gel method. It is found that the well-crystallized BLFNO film is polycrystalline, and the Pt / BLFNO / Pt capacitor possesses good ferroelectric properties with remnant polarization of 74 μC/cm2 at electric field of 833 kV/cm. Moreover, it is also found that the leakage current density of the Pt / BLFNO / Pt capacitor increases with the increase of measurement temperature ranging from 100 to 300 K. The leakage density of the Pt / BLFNO / Pt capacitor satisfies space-charge-limited conduction (SCLC) at higher electric field and shows little dependence on voltage polarity and temperature, but shows polarity and temperature dependence at lower applied electric field. With temperature increasing from 100 to 300 K at lower applied electric field, the most likely conduction mechanism is from Ohmic behavior to SCLC for positive biases, but no clear dominant mechanism for negative biases is shown.

36

Yakovlev, Nikita N., Aleksei V. Almaev, Bogdan O. Kushnarev, Maksim G. Verkholetov, Maksim V. Poliakov e Mikhail M. Zinovev. "β-Ga2O3 Schottky Barrier Diode with Ion Beam Sputter-Deposited Semi-Insulating Layer". Crystals 14, n. 2 (26 gennaio 2024): 123. http://dx.doi.org/10.3390/cryst14020123.

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Abstract (sommario):

Vertical Schottky barrier diodes based on an ion beam sputter (IBS)-deposited β-Ga2O3 film on a single-crystalline (2¯01) unintentionally doped (UID) β-Ga2O3 with a Ni contact were developed. To form ohmic Ti/Ni contacts, the IBS-Ga2O3/UID β-Ga2O3 structures were wet-etched, and an indium tin oxide (ITO) intermediate semiconductor layer (ISL) was deposited on the opposite surface of the UID β-Ga2O3. The IBS-deposited Ga2O3 layer was polycrystalline and semi-insulating. Low leakage currents, rectification ratios of 3.9 × 108 arb. un. and 3.4 × 106 arb. un., ideality factors of 1.43 and 1.24, Schottky barrier heights of 1.80 eV and 1.67 eV as well as breakdown voltages of 134 V and 180 V were achieved for diodes without and with ITO-ISL, respectively. The surface area of the IBS-Ga2O3 film acted as a thin dielectric layer and, together with the preliminary wet etching, provided low leakage currents and relatively high Schottky barrier heights. Diodes with a Schottky barrier based on a Ni/IBS-deposited Ga2O3 film contact were demonstrated for the first time.

37

Peng, Zeng-Wei, Ying-Long Wang e Bao-Ting Liu. "Enhanced open circuit voltage in photovoltaic effect of polycrystalline La and Ni co-doped BiFeO3 film". Functional Materials Letters 08, n. 01 (febbraio 2015): 1550002. http://dx.doi.org/10.1142/s1793604715500022.

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Abstract (sommario):

Photovoltaic (PV) effect of polycrystalline Bi 0.975 La 0.025 Fe 0.975 Ni 0.025 O 3 (BLFNO) film grown on Pt (111)/ Ti/SiO 2/ Si (001) substrate using sol–gel method has been investigated. The BLFNO film possesses good ferroelectric property and large twice-remanent polarization. It is found that PV response exhibited a strong dependence on the potential of top indium tin oxide (ITO) and bottom Pt electrode. The open circuit voltage is -0.67 V when the potential of ITO electrode is higher than that of Pt electrode and 0.45 V when the potential of ITO electrode is lower than that of Pt electrode. This can be interpreted by the variation of barrier heights at both ITO/BLFNO and BLFNO/ Pt interfaces.

38

Gall, Ken, Huseyin Sehitoglu, Yuriy I. Chumlyakov, Yuriy L. Zuev e Ibrahim Karaman. "The role of coherent precipitates in martensitic transformations in single crystal and polycrystalline Ti-50.8at%Ni". Scripta Materialia 39, n. 6 (agosto 1998): 699–705. http://dx.doi.org/10.1016/s1359-6462(98)00236-x.

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39

Callahan, Patrick G., McLean P. Echlin, Jean Charles Stinville, Tresa M. Pollock, Saransh Singh, Farangis Ram e Marc De Graef. "Three-dimensional texture visualization approaches: applications to nickel and titanium alloys". Journal of Applied Crystallography 50, n. 5 (9 agosto 2017): 1267–79. http://dx.doi.org/10.1107/s1600576717010470.

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Abstract (sommario):

This paper applies the three-dimensional visualization techniques explored theoretically by Callahan, Echlin, Pollock, Singh & De Graef [J. Appl. Cryst.(2017),50, 430–440] to a series of experimentally acquired texture data sets, namely a sharp cube texture in a single-crystal Ni-based superalloy, a sharp Goss texture in single-crystal Nb, a random texture in a powder metallurgy polycrystalline René 88-DT alloy and a rolled plate texture in Ti-6Al-4V. Three-dimensional visualizations are shown (and made available as movies as supplementary material) using the Rodrigues, Euler and three-dimensional stereographic projection representations. In addition, it is shown that the true symmetry of Euler space, as derived from a mapping onto quaternion space, is described by the monoclinic color space groupPccin the Opechowski and Guccione nomenclature.

40

Jibaly, M., E. C. Kellogg, A. Weiß, A. R. Koymen, D. Mehl e L. Stiborek. "Determination of the Positron Work Functions of Cu(100) and Polycrystalline Fe, Mo, Ni, Pt, Ti and V". Materials Science Forum 105-110 (gennaio 1992): 1399–402. http://dx.doi.org/10.4028/www.scientific.net/msf.105-110.1399.

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41

Hollanders, Mark A., Barend J. Thijsse e Eric J. Mittemeijer. "Amorphization along interfaces and grain boundaries in polycrystalline multilayers: An x-ray-diffraction study of Ni/Ti multilayers". Physical Review B 42, n. 9 (15 settembre 1990): 5481–94. http://dx.doi.org/10.1103/physrevb.42.5481.

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42

Gomes, Rodinei Medeiros, Ana Cris R. Veloso, V. T. L. Buono, Severino Jackson Guedes de Lima e Tadeu Antonio de Azevedo Melo. "Pseudoelasticity of Cu-13.8Al-Ni Alloys Containing V and Nb". Advances in Science and Technology 59 (settembre 2008): 101–7. http://dx.doi.org/10.4028/www.scientific.net/ast.59.101.

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Abstract (sommario):

Polycrystalline copper-based shape memory alloys have been of particular interest in relation to Ni-Ti because of their low cost and good shape memory effect. Nevertheless the absence of a pronounced pseudoelasticity effect restricts the number of potential applications. In this work, the influence of Nb and V on the microstructure and the mechanical properties was investigated. Samples of Cu-13.8 Al-Ni containing V and Nb alloy were prepared by induction and solution treated at 850°C and then further quenched into cold water. The addition of Nb and V promotes the formation of precipitates which act as grain refiner and subsequently improve the mechanical properties. The tensile tests were performed at temperatures slightly inferior to Mf and superior to Af, to investigate the shape recovery and pseudoelasticity, respectively. Based on the analyses of the Cu-13,8Al-2Ni-1Nb (wt%) alloy was detected rupture strains greater than 14%, besides observation of the superelasticity of these alloys and quantification of this property by means of cycling, from 0 to strains between 1 and 7%. The studies performed on alloy Cu-13.8Al- 3,5Ni-1V (wt%) made it possible to determine rupture strains in the order of 3% and its superelastic behavior through cycling for deformations between 1 and 3%.

43

Guan, Ziqi, Xinjun Jiang, Jianglong Gu, Jing Bai, Xinzeng Liang, Haile Yan, Yudong Zhang, Claude Esling, Xiang Zhao e Liang Zuo. "Large magnetocaloric effect and excellent mechanical properties near room temperature in Ni-Co-Mn-Ti non-textured polycrystalline alloys". Applied Physics Letters 119, n. 5 (2 agosto 2021): 051904. http://dx.doi.org/10.1063/5.0058609.

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44

Yang, Zhi, Daoyong Cong, Yuan Yuan, Runguang Li, Hongxing Zheng, Xiaoming Sun, Zhihua Nie, Yang Ren e Yandong Wang. "Large room-temperature elastocaloric effect in a bulk polycrystalline Ni-Ti-Cu-Co alloy with low isothermal stress hysteresis". Applied Materials Today 21 (dicembre 2020): 100844. http://dx.doi.org/10.1016/j.apmt.2020.100844.

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45

Miller, M. K. "Atom Probe Tomography Of Interfaces". Microscopy and Microanalysis 5, S2 (agosto 1999): 118–19. http://dx.doi.org/10.1017/s143192760001391x.

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Abstract (sommario):

The technique of atom probe tomography (APT) enables the x, y, and z coordinates and the elemental identities of the atoms in a small volume to be determined at the atomic level. Therefore, the APT technique may be used to characterize solute segregation to interfaces and precipitation in terms of concentration gradients and precipitate morphology. This type of information may be used to optimize the design of alloys.The material that was used to illustrate the capabilities of atom probe tomography is a complex polycrystalline nickel-based superalloy, Alloy 718. The composition of this commercial superalloy is Ni- 3.2 at. % Nb, 0.96% Al, 1.15% Ti, 20.3% Fe, 21.8% Cr, 0.26% Co, 1.8% Mo, 0.16% Mn, 0.21% Si and 0.26% C. The material was characterized after a heat treatment oM h at 1038°C + 8 h at 870°C + 500 h at 600°C. Previous atom probe field ion microscopy characterizations of this material has demonstrated that there is no intragranular precipitation after the anneal at 1038°C.

46

Sobrero, C. E., C. Lauhoff, T. Wegener, T. Niendorf e P. Krooß. "On the Impact of Texture and Grain Size on the Pseudoelastic Properties of Polycrystalline Fe–Ni–Co–Al–Ti Alloy". Shape Memory and Superelasticity 6, n. 2 (8 maggio 2020): 191–201. http://dx.doi.org/10.1007/s40830-020-00280-4.

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47

Wang, J., Y. Du, S. L. Shang, Z. K. Liu e Y. Li. "Effects of alloying elements on elastic properties of Al by first-principles calculations". Journal of Mining and Metallurgy, Section B: Metallurgy 50, n. 1 (2014): 37–44. http://dx.doi.org/10.2298/jmmb140116002w.

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Abstract (sommario):

The effects of alloying elements (Co, Cu, Fe, Ge, Hf, Mg, Mn, Ni, Si, Sr, Ti, V, Y, Zn, and Zr) on elastic properties of Al have been investigated using first-principles calculations within the generalized gradient approximation. A supercell consisting of 31 Al atoms and one solute atom is used. A good agreement is obtained between calculated and available experimental data. Lattice parameters of the studied Al alloys are found to be depended on atomic radii of solute atoms. The elastic properties of polycrystalline aggregates including bulk modulus (B), shear modulus (G), Young?s modulus (E), and the B/G ratio are also determined based on the calculated elastic constants (cij?s). It is found that the bulk modulus of Al alloys decreases with increasing volume due to the addition of alloying elements and the bulk modulus is also related to the total molar volume (Vm) and electron density (nAl31x) with the relationship of nAl31x=1.0594+0.0207?B/Vm. These results are of relevance to tailor the properties of Al alloys.

48

Mannan, Md Abdul, Yuji Baba, Tetsuya Kida, Masamitsu Nagano, Iwao Shimoyama, Norie Hirao e Hideyuki Noguchi. "Orientation of B–C–N hybrid films deposited on Ni (111) and polycrystalline Ti substrates explored by X-ray absorption spectroscopy". Thin Solid Films 519, n. 6 (gennaio 2011): 1780–86. http://dx.doi.org/10.1016/j.tsf.2010.09.052.

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49

Mun, Bongjin Simon, Masamitsu Watanabe, Massimiliano Rossi, Vojislav Stamenkovic, Nenad M. Markovic e Philip N. Ross. "A study of electronic structures of Pt3M (M=Ti,V,Cr,Fe,Co,Ni) polycrystalline alloys with valence-band photoemission spectroscopy". Journal of Chemical Physics 123, n. 20 (22 novembre 2005): 204717. http://dx.doi.org/10.1063/1.2126662.

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50

Ivanova, Tatyana, Antoaneta Harizanova, Tatyana Koutzarova e Benedicte Vertruyen. "Preparation and Investigation of Sol–Gel TiO2-NiO Films: Structural, Optical and Electrochromic Properties". Crystals 14, n. 2 (14 febbraio 2024): 192. http://dx.doi.org/10.3390/cryst14020192.

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Abstract (sommario):

TiO2 and TiO2-NiO films were successfully derived by a sol–gel dip coating technology. The impact of the thermal treatments (300–600 °C) on the structural, optical and electrochromic properties was investigated. X-ray diffraction (XRD) analysis showed that TiO2 films were polycrystalline and evolved in the anatase phase. The composite TiO2-NiO films, treated at annealing temperatures below 500 °C, contained anatase titania, a small inclusion of cubic NiO and an amorphous fraction. The formation of NiTiO3 was exposed after the highest annealing at 600 °C. The presence of Ti-O-Ni bonds was determined in the composite films by Fourier-transform infrared (FTIR) spectroscopy. The optical properties and the optical band gap of TiO2-NiO films were investigated and discussed. The transparency of the electrochromic TiO2-NiO films was 76.8 and 78.3% in the 380–700 nm spectral range after film thermal treatments at 300 and 500 °C. NiO incorporation led to the narrowing of the optical band gap. The electrochromic (EC) properties of the composite films were improved compared to TiO2 films. They had higher diffusion coefficients. Their color efficiencies are 37.6 (550 nm) and 52.2 cm2/C (600 nm).