scholarly journals SPECIFIC STRUCTURE OF EFFECTIVE MEMBRANE ALLOYS BASED ON NIOBIUM, VANADIUM AND ZIRCONIUM

2021 ◽  
pp. 728-739
Author(s):  
Эльмира Джумшудовна Курбанова ◽  
Римма Михайловна Белякова ◽  
Валерий Анатольевич Полухин
Keyword(s):  
Amorphous Matrix ◽  
Gaseous Hydrogen ◽  
Ternary Alloys ◽  
Hydrogen Energy ◽  
Duplex Microstructure ◽  
Group V ◽  
Cu Alloys ◽  
Hydride Embrittlement ◽  
Effective Use ◽  
Brittle Destruction

Аморфные, нанокристаллические мембранные сплавы на основе элементов V группы с уникальными механическими и функциональными свойствами и с матричной дуплексной микроструктурой активно способствуют развитию водородной энергетики. Имеются еще не вполне разрешенные проблемы для этих новых сплавов -их низкая термическая стабильность, недосточная механическая прочность (пластичность, твердость), а также охрупчивание интерметаллидное и гидридное. Для эффективного применения разрабатываются сплавы с тройным составом - в которые помимо элементов V группы входят и легирующие металлы никель и титан. Получают не только аморфные и нанокристаллические сплавы, применимые в электронике и электроэнергетике, а также мембранные сплавы с дуплексной матричной структурой, объединяющей аморфные, так нано- и квазикристаллические дендритно упрочняющие фазы, как упрочняющие аморфную матрицу. В специализируемых мембранных тройных сплавах формируются соединения NiTi и NiTi, стабилизирующие и предохраняющие нано- и кристаллические мембраны от хрупкого разрушения. Установлено, что интенсивное образование гидридов в этих альтернативных мембранных сплавах столь же не желательно, как и для традиционных сплавов на основе палладия. Рассматриваемые сплавы действительно позволяют получить газообразный водород высокой чистоты с применением новых составов взамен дорогостоящих мембран на основе сплавов Pd - Au / Ag / Cu. With unique mechanical and functional properties, amorphous, nanocrystalline and matrix duplex microstructure membrane alloys based on group V elements actively contribute to the development of hydrogen energy. There are still not completely resolved problems for these new alloys - their low thermal stability, insufficient mechanical strength (plasticity, hardness), and intermetallic and hydride embrittlement. For effective use, alloys with a triple composition are being developed - which, in addition to the elements of group V, also include nickel and titanium as alloying metals. Not only amorphous and nanocrystalline alloys are obtained that are applicable in electronics and power engineering, as well as membrane alloys with a duplex matrix structure that combines amorphous, nano-and quasicrystalline dendritic-hardening phases strengthening the amorphous matrix. In specialized membrane ternary alloys, NiTi and NiTi compounds are formed, which stabilize and protect nano-and crystalline membranes from brittle destruction. It has been found that the intense formation of hydrides in these alternative membrane alloys is as undesirable as for palladium-based compounds. The alloys under consideration actually make it possible to obtain high-purity gaseous hydrogen using new compositions instead of expensive membranes based on Pd - Au / Ag / Cu alloys.

Phase Equilibria and Solidification of Al-Rich Ai-Ui-Cu Alloys

1990 ◽  
Vol 186 ◽  
Author(s):  
Sinn-Wen Chen ◽  
Y. Austin Chang
Keyword(s):  
Liquidus Projection ◽  
Thermodynamic Description ◽  
Type Equation ◽  
Ternary Alloys ◽  
X Ray Diffraction ◽  
Thermodynamic Models ◽  
Isothermal Sections ◽  
X Ray ◽  
Cu Alloys ◽  
Calculated Amount

AbstractA liquidus projection of the Al-rich Al-Li-Cu system is proposed. The proposed liquidus projection was based on DTA, X-ray diffraction, metallography, EPMA, SEM, and chemical analysis of 50 ternary alloys. Using these data and those reported in the literature, and thermodynamic models of Al-Li, AI-Cu and Cu-Li, a thermodynamic description of the Al-rich AI-Li-Cu system was developed. The calculated isothermal sections at several temperatures and the liquidus projection are in agreement with the experimental determinations. Combining the thermodynamic models and a Scheil-type equation, quantitative solidification paths were described. The calculated amount of primary solidification phase was compared to the experimental determination.

X-ray diffraction studies of rapid cooled Al-V and Al-Fe-V alloys

2019 ◽  
Vol 1 (96 extended issue) ◽  
pp. 5-11
Author(s):  
O. Shved ◽  
S. Mudry ◽  
V. Girzhon ◽  
O. Smolyakov
Keyword(s):  
Mechanical Properties ◽  
Physical Properties ◽  
Amorphous Matrix ◽  
Diffraction Method ◽  
Ternary Alloys ◽  
X Ray Diffraction ◽  
Rapid Cooling ◽  
X Ray ◽  
Cell Parameters ◽  
Nonequilibrium Conditions

Purpose: of this paper is to deep and more complete knowledge about the features of phase and structure formation in Al-based alloys with transition metals (TM) Fe and V at rapid cooling from melt. It is known, that nonequilibrium synthesis conditions of such alloys lead to quasicrystalline, amorphous or metastable phases formation, which can significantly improve the physical-chemical properties and first of all the mechanical ones. But understanding of compositional dependences of structure features at formation under nonequilibrium conditions and the correlation of these dependences with physical properties of alloys is far to be clear. Design/methodology/approach: Structure of Al-enriched Al-V, Al-V-Fe rapid cooled alloys was studied by X-ray diffraction method. In order to estimate the influence of structural state of alloy on the mechanical properties the integral microhardness was studied by Vickers method. Findings: Two quasicrystalline icosaedral phases with different cell parameters are revealed in ternary alloys Al100-3xV2xFex (x=2-4). Increasing of transition metal content promotes the formation of phase with higher quasicell parameter embedded in amorphous matrix. With increasing of the transition elements total content from 6 up to 12 at. % the microhardness of alloys increased gradually from 867 to 3050 MPa. Research limitations/implications: Research of nonequilibrium alloys revealed crystalline structure of Al-V alloys and quasicrystalline embedded in amorphous matrix of Al-Fe-V ternary alloys. Obtained results suppose that further structure and physical properties studies of Al-Fe-V alloys will allows to find the conditions to control the producing of materials with desired properties. Practical implications: Using of rapid cooling method for synthesis of Al-enriched Al-Fe-V alloys give an opportunity to produce alloys with significantly improved mechanical properties. Originality/value: Nonequilibrium conditions of cooling allow significantly changes the structure and properties.

scholarly journals The Effects of Adding Elements of Zinc and Magnesium on Ag-Cu Eutectic Alloy for Warming Acupuncture

2013 ◽  
Vol 2013 ◽  
pp. 1-10
Author(s):  
Yu Kyoung Kim ◽  
Il Song Park ◽  
Keun Sik Kim ◽  
Min Ho Lee
Keyword(s):  
Mechanical Properties ◽  
Thermal Conductivity ◽  
Physical And Mechanical Properties ◽  
Ternary Alloys ◽  
Suitable Material ◽  
Cu Alloys ◽  
Hyperthermia Therapy ◽  
Mg Addition ◽  
Composition Ratios ◽  
Potential Use

The warming acupuncture for hyperthermia therapy is made of STS304. However, its needle point cannot be reached to a desirable temperature due to heat loss caused by low thermal conductivity, and the quantification of stimulation condition and the effective standard establishment of warming acupuncture are required as a heat source. Accordingly, in this study, after Ag-Cu alloys with different composition ratios were casted and then mixed with additives to improve their physical and mechanical properties, the thermal conductivity and biocompatibility of the alloy specimens were evaluated for selecting suitable material. Ag-Cu binary alloys and ternary alloys added 5 wt% Zn or 2 wt% Mg were casted and then cold drawn to manufacture needles for acupuncture, and their physical properties, thermal conductivity, and biocompatibility were evaluated for their potential use in warming acupuncture. The results of this study showed that the physical and mechanical properties of the Ag-Cu alloys were improved by additives and that the thermal conductivity, machinability, and biocompatibility of the Ag-Cu alloys were improved by Mg addition.

scholarly journals Quaternary Hydrides Pd1-y-zAgyCuzHx Embedded Atom Method Potentials for Hydrogen Energy Applications

2021 ◽  
Vol 3 (1) ◽  
Author(s):  
Chaonan Zhang ◽  
Robert Fuller ◽  
Iyad Hijazi ◽  
Keyword(s):  
Mechanical Properties ◽  
Carbon Monoxide Poisoning ◽  
Hydrogen Permeability ◽  
Sulfur Poisoning ◽  
Ternary Alloys ◽  
Miscibility Gap ◽  
Embedded Atom Method ◽  
Hydrogen Energy ◽  
Energy Applications ◽  
Embedded Atom

The Pd-H system has attracted extensive attention. Pd can absorb considerable amount of H at room temperature, this ability is reversible, so it is suitable for multiple energy applications. Pd-Ag alloys possess higher H permeability, solubility and narrower miscibility gap with better mechanical properties than pure Pd, but sulfur poisoning remains an issue. Pd-Cu alloys have excellent resistance to sulfur and carbon monoxide poisoning and hydrogen embrittlement, good mechanical properties, and broader temperature working environments over pure Pd, but relatively lower hydrogen permeability and solubility than pure Pd and Pd-Ag alloys. This suggests that alloying Pd with Ag and Cu to create Pd-Ag-Cu ternary alloys can optimize the overall performance and substantially lowers the cost. Thus, in this paper, we provide the first embedded atom method potentials for the quaternary hydrides Pd1-y-zAgyCuzHx. The fully analytical potentials are fitted utilizing the central atom method without performing time-consuming molecular dynamics simulations.

scholarly journals An investigation of gaseous hydrogen storage characterizations of Mg–Y–Ni–Cu alloys synthesized by melt spinning

RSC Advances ◽  
2018 ◽  
Vol 8 (51) ◽  
pp. 28969-28977 ◽  
Author(s):  
Yanghuan Zhang ◽  
Yanquan Ji ◽  
Zeming Yuan ◽  
Wengang Bu ◽  
Yan Qi ◽  
...  
Keyword(s):  
Hydrogen Storage ◽  
Melt Spinning ◽  
Gaseous Hydrogen ◽  
Hydrogen Storage Kinetics ◽  
Cu Alloys ◽  
Crystalline Alloy ◽  
Kinetics Of

Melt spinning enables the crystalline alloy to be strongly disordered and nanostructured, thus enhancing the hydrogen storage kinetics of Mg25−xYxNi9Cu.

Prospects Analysis of Integrated-Wrapped Multi-Layer Vessels Used as High Pressure Gaseous Hydrogen Storage Vessels

2012 ◽  
Vol 588-589 ◽  
pp. 1755-1759 ◽  
Author(s):  
Peng Yun Song ◽  
Jie Gao ◽  
Fang Bo Ma
Keyword(s):  
High Pressure ◽  
Hydrogen Storage ◽  
Safety Monitoring ◽  
Gaseous Hydrogen ◽  
Research Progress ◽  
Hydrogen Energy ◽  
Storage Vessel ◽  
Hydrogen Storage Vessel ◽  
Pressure Resistance ◽  
Pressure Hydrogen

High pressure gaseous hydrogen energy is the most mature technology of hydrogen utilizing. High pressure gaseous hydrogen storage involves with high pressure vessel. In this paper, the research of high pressure gaseous hydrogen storage vessel is reviewed, and the research progress of multi-layer vessel used as high pressure hydrogen storage vessel is especially introduced. An integrated multi-layer-wrapped cylinder which may be used as high pressure gaseous hydrogen storage equipment is analyzed. The cylinder consists of lining, internal cylinder and multi-layer laminates. Lining and internal cylinder are made of anti-hydrogen steel, while the laminates are wrapped outside the internal cylinder to the required thickness with integrated wrapping method. The circumferential and longitudinal welding seams can be staggered in each laminate. The hydrogen leaking detection device is located in each cylinder section. This cylinder is provided with bearing pressure, resistance to hydrogen, anti-burst, online safety monitoring and other characteristics, which offers a possible structure for the construction of high pressure hydrogen storage vessel.

Observation of the Complex Local Crystallization Process in Ti-Zr-Cu-Pd Amorphous Ribbons and Bulk Metallic Glass

2013 ◽  
Vol 58 (2) ◽  
pp. 347-350 ◽  
Author(s):  
A. Sypień
Keyword(s):  
Metallic Glass ◽  
Metallic Glasses ◽  
Crystallization Process ◽  
Amorphous Matrix ◽  
Glass Forming Ability ◽  
Duplex Microstructure ◽  
Glass Forming ◽  
Amorphous Ribbons ◽  
Nanocrystalline Particles ◽  
High Resolution Tem

In recent years, bulk metallic glasses (BMGs) have attracted much attention, especially concerning the reasons for the high glass-forming ability. To understand properties and glass-forming ability of BMGs, it is important to investigate their atomic structure in details. The structure of the metallic glass, derived from diffraction studies, confines mainly to short-range-order atomic correlations, which are statistically averaged over the glassy specimens. In the present study, local structure of a BMG and ribbons was observed using a high-resolution TEM (TECNAI G2 FEG). The TEM images of the BMG before annealed in the temperature below the crystallization clearly reveal a duplex microstructure consisting of nanocrystalline particles about 5-10 nm in size distributed uniformly in the amorphous matrix. Due to the FFT research the crystalline phases may be indexed as the Cu8Zr3, Cu3Pd, CuTi2 and CuTiZr.

Gaseous hydrogen storage properties of Mg-Y-Ni-Cu alloys prepared by melt spinning

2019 ◽  
Vol 37 (7) ◽  
pp. 750-759
Author(s):  
Yanghuan Zhang ◽  
Yaqin Li ◽  
Wei Zhang ◽  
Zeming Yuan ◽  
Zhonghui Hou ◽  
...  
Keyword(s):  
Hydrogen Storage ◽  
Melt Spinning ◽  
Gaseous Hydrogen ◽  
Hydrogen Storage Properties ◽  
Cu Alloys ◽  
Storage Properties
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