Analytical Modeling of Strength and Electrical Conductivity of Nanostructured Cu-Cr Alloys

2018 ◽  
Vol 385 ◽  
pp. 256-261 ◽  
Author(s):  
Roza G. Chembarisova ◽  
Igor V. Alexandrov ◽  
Wei Wei
Keyword(s):  
Crystal Structure ◽  
Electrical Conductivity ◽  
Analytical Modeling ◽  
Secondary Phase ◽  
Strength Characteristics ◽  
Modeling Methods ◽  
Subsequent Deformation ◽  
Zr Alloy

The analysis of the strength characteristics and electrical conductivity of annealed Cu-1.0wt.%Cr-0.1wt%Zr alloy subjected to subsequent deformation under various conditions was carried out by analytical modeling methods. The contributions of the regions with nanotwins, as well as such defects of the crystal structure as vacancies, alloying atoms, dislocations, and particles of the secondary phase to the strength and electrical conductivity of the material were estimated.

scholarly journals Влияние границ зерен на электропроводность медных сплавов

2020 ◽  
Vol 90 (4) ◽  
pp. 618
Author(s):  
Р.Г. Чембарисова
Keyword(s):  
Plastic Deformation ◽  
Analytical Modeling ◽  
Structural Changes ◽  
Secondary Phases ◽  
Small Particles ◽  
Modeling Methods ◽  
Angular Pressing ◽  
The Matrix ◽  
Zr Alloy ◽  
Zr Alloys

The analysis by analytical modeling methods of the experimentally detected lack of sensitivity of the resistivity of Cu-Cr, Cu-Cr-Zr alloys to the structural changes observed in samples subjected to severe plastic deformation was performed. Using the Cu-1.8 wt% Cr-0.8 wt% Zr alloy as an example, it is shown that an increase in the contribution to the resistivity of grain boundaries and precipitated small particles of secondary phases after equal-channel angular pressing is compensated mainly by a decrease in the contribution to the resistivity of alloying elements in the matrix.

Microstructure and properties of Cu-Cr-Zr alloy with columnar crystal structure processed by upward continuous casting

2022 ◽  
Vol 889 ◽  
pp. 161700
Author(s):  
Jinshui Chen ◽  
Xiangpeng Xiao ◽  
Dawei Yuan ◽  
Chengjun Guo ◽  
Hao Huang ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Continuous Casting ◽  
Columnar Crystal ◽  
Microstructure And Properties ◽  
Zr Alloy

scholarly journals NaFePO4 Cathode Prepared from The Caustic Fusion of A Mix Ilmenite-Hematite Followed by Cyclic Voltammetry for Na Insertion

2020 ◽  
Vol 9 (2) ◽  
pp. 142-152
Author(s):  
Fitria Rahmawati ◽  
◽  
Dwi Aman Nur Romadhona ◽  
Syulfi Faiz ◽  
◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Cyclic Voltammetry ◽  
Secondary Phase ◽  
Impedance Analysis ◽  
Fusion Method ◽  
Peak Point ◽  
Fe Content ◽  
Scan Rate ◽  
Hematite Fe2o3 ◽  
Resistance Value

Research to prepare NaFePO4 cathode material from iron sand was conducted. The iron sand consists of ilmenite FeTiO3 and hematite Fe2O3. A caustic fusion method used to precipitate iron as Fe(OH)3 and it increased Fe content up to 94.71 %. Phosphate precipitation successfully produced trigonal FePO4 and monoclinic FePO4 comply with ICSD#412736 and ICSD#281079. The prepared-FePO4 was then used as a precursor for Na insertion by applying cyclic voltammetry mode within 2.0 – 4.0 V with 0.05 mVs-1 of the scan rate. It produced orthorhombic olivine NaFePO4 and a secondary phase of orthorhombic Na0.7FePO4. Impedance analysis at 20 Hz – 5 MHz found that the material provided a semicircle at 100 Hz peak point, indicating electrode-bulk interface with a resistance value of 1735W, comparable to the electrical conductivity of 5.36 x 10-6 Scm-1. Even though the conductivity value is quite lower than NaFePO4 prepared from a commercial FePO4 that has been conducted in our previous research, however the electrical conductivity still reliable for cathode.

scholarly journals STRUCTURAL CHARACTERIZATION OF THE NEW DIAMOND-LIKE SEMICONDUCTOR CuNbGaSe3

2018 ◽  
Vol 15 (29) ◽  
pp. 228-233
Author(s):  
J. A. FLORES-CRUZ ◽  
G. E. DELGADO ◽  
J. E. CONTRERAS ◽  
M. QUINTERO ◽  
L. NIEVES ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Magnetic Behavior ◽  
Secondary Phase ◽  
Chalcopyrite Structure ◽  
Unit Cell Parameters ◽  
X Ray ◽  
Cell Parameters ◽  
Chalcogenide Compound ◽  
Semiconductor Type

The chalcogenide compound CuNbGaSe3, belonging to the system I-II-III-VI3, has been investigated by means of X-ray powder diffraction and its crystal structure has been refined by the Rietveld method.This is a material of the semiconductor type, which improves the properties of a simple semiconductor like CuGaSe2 because it ads spintronic applications due to its magnetic behavior. The powder pattern was composed by 94.2% of the principal phase CuNbGaSe3 and 5.8% of the secondary phase Cu0.667NbSe2. This material crystallizes with a CuFeInSe3-type structure in the tetragonal space group P4 2c (Nº 112), unit cell parameters a = 5.6199(4) Å, c = 11.0275(2) Å, V = 348.28(4) Å3, with a normal adamantane-structure where occurs a degradation of symmetry from the chalcopyrite structure I4 2d to a related structure P4 2c.

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