Simple Metal and Binary Alloy Phases Based on the &lt;em&gt;fcc&lt;/em&gt; Structure: Electronic Origin of Distortions, Superlattices and Vacancies

Degtyareva, V.F.; Afonikova, N. S.

doi:10.20944/preprints201701.0002.v1

2017

DOI: 10.20944/preprints201701.0002.v1

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Simple Metal and Binary Alloy Phases Based on the <em>fcc</em> Structure: Electronic Origin of Distortions, Superlattices and Vacancies

V.F. Degtyareva

N. S. Afonikova

Abstract: Crystal structures of simple metals and binary alloy phases based on the face-centered cubic (fcc) structure are analyzed within the model of Fermi sphere -Brillouin zone interactions to understand the stability of original cubic structure and derivative structures with distortions, superlattices and vacancies. Examination of the Brillouin-Jones configuration in relation to the nearly-free electron Fermi sphere for several representative phases reveals significance of the electron energy contribution to the ph… Show more

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Cited by 4 publications

References 36 publications

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Sol–Gel Encapsulation of ZnAl Alloy Powder with Alumina Shell

Svetlizky

Eliaz

2021

Coatings

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Additive manufacturing (AM), for example, directed energy deposition (DED), may allow the processing of self-healing metal–matrix composites (SHMMCs). The sealing of cracks in these SHMMCs would be achieved via the melting of micro-encapsulated low melting point particulates (LMPPs), incorporated into the material during AM, by heat treatment of the part during service. Zn-Al alloys are good candidates to serve as LMPPs, for example, when the matrix of the MMC is made of an aluminum alloy. However, such powders should first be encapsulated by a thermal and diffusion barrier. Here, we propose a sol–gel process for encapsulation of a custom-made ZA-8 (Zn92Al8, wt.%) core powder in a ceramic alumina (Al2O3) shell. We first modify the surface of the ZA-8 powder with (12-phosphonododecyl)phosphonic acid (Di-PA) hydrophobic self-assembled monolayer (SAM) in order to prevent extensive hydrogen evolution and formation of non-uniform and porous oxide/hydroxide surface layers during the sol–gel process. Calcination for 1 h at 500 °C is found to be insufficient for complete boehmite-to-γ(Al2O3) phase transformation. Thermal stability tests in an air-atmosphere furnace at 600 °C for 1 h result in melting, distortion, and sintering into a brittle sponge (aggregate) of the as-atomized powder. In contrast, the core/shell powder is not sintered and preserves its spherical morphology, with no apparent “leaks” of the ZA-8 core alloy out of the ceramic encapsulation.

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Sol–Gel Encapsulation of ZnAl Alloy Powder with Alumina Shell

Svetlizky

Eliaz

2021

Coatings

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Effects of Annealing on the Microstructure and Wear Resistance of Laser Cladding CrFeMoNbTiW High-Entropy Alloy Coating

Shen

Zhao

et al. 2021

Crystals

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In this study, a CrFeMoNbTiW high-entropy alloy (HEA) coating was prepared on a Q245R steel (American grade: SA515 Gr60) substrate by means of laser cladding. The effects of annealing temperature on the microstructure and wear resistance of the CrFeMoNbTiW coating were investigated using X-ray diffraction (XRD), a scanning electron microscope (SEM), a Vickers hardness tester and a roller friction wear tester. The results showed that the coating was mainly composed of body-centered cubic (BCC) solid solution and face-centered cubic (FCC) structural (Nb,Ti)C carbides prior to annealing, exhibiting an interdendritic structure and needlelike dendritic crystal structure with average microhardness of 682 HV0.2. The coarsening of the dendrite arms increased gradually after a 10-h long annealing treatment at 800 °C, 900 °C and 1000 °C, and a small amount of Laves phase was produced. After annealing, the highest microhardness value of the as-annealed coating reached 1176 HV0.2, which represents an increase of approximately 72.5% compared to that of the as-deposit coating. The wear resistance testing results imply that this type of coating retains good wear resistance following the annealing treatment and that its wear resistance increases in proportion to the annealing temperature in a range from 800 °C to 1000 °C.

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Shape-Controlled TiCx Particles Fabricated by Combustion Synthesis in the Cu-Ti-C System

et al. 2017

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TiC x particle-reinforced Cu-matrix composites were prepared in the Cu-TiC system by thermal explosion and hot press. Extracted TiC x particles with various shapes of in situ TiC x particles in the Cu-TiC system were observed through the Field Emission Scanning Electron Microscope (FESEM). It was found that octahedral and close-to-spherical, spherical or cubic TiC x could be fabricated by changing the C/Ti molar ratio and Cu content. Then, the effect of the C/Ti molar ratio and constituent element concentrations on the shape of in situ TiC x particles was determined: the shape of TiC x particles is octahedral at a C/Ti ratio of 0.4-0.6 with the presence of 70 vol% Cu; or spherical and close-to-spherical at 0.8-1.0 with the presence of 70 vol% Cu; or cubic at C/Ti ratios ≥1.0 with the presence of Cu from 80 vol%-90 vol% and even at C/Ti ratios >1.0 with the presence of 70 vol% Cu. The shape-controlled synthesis of TiC x particles in the Cu-TiC system is realized.

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Simple Metal and Binary Alloy Phases Based on the <em>fcc</em> Structure: Electronic Origin of Distortions, Superlattices and Vacancies

Cited by 4 publications

References 36 publications

Sol–Gel Encapsulation of ZnAl Alloy Powder with Alumina Shell

Sol–Gel Encapsulation of ZnAl Alloy Powder with Alumina Shell

Effects of Annealing on the Microstructure and Wear Resistance of Laser Cladding CrFeMoNbTiW High-Entropy Alloy Coating

Shape-Controlled TiCx Particles Fabricated by Combustion Synthesis in the Cu-Ti-C System

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