scholarly journals Magnetic and thermodynamic properties of face-centered cubic Fe–Ni alloys

2014 ◽  
Vol 16 (30) ◽  
pp. 16049 ◽  
Author(s):  
M. Yu. Lavrentiev ◽  
J. S. Wróbel ◽  
D. Nguyen-Manh ◽  
S. L. Dudarev
Keyword(s):  
Thermodynamic Properties ◽  
Face Centered Cubic ◽  
Ni Alloys ◽  
Face Centered

57Fe Mössbauer isomer shifts in random face-centered cubic Fe–Ni alloys: Experiment versus electronic structure calculations

1992 ◽  
Vol 70 (12) ◽  
pp. 1241-1243 ◽  
Author(s):  
D. G. Rancourt ◽  
J. Y. Ping ◽  
M.-Z. Dang
Keyword(s):  
Tight Binding ◽  
Stability Limit ◽  
Quantitative Agreement ◽  
Face Centered Cubic ◽  
Linear Variation ◽  
Ni Alloys ◽  
Volume Dependence ◽  
Experiment Versus ◽  
Face Centered ◽  
Structure Calculations

Measured 57Fe-isomer shifts for face-centered cubic FeyNi1−y alloys show a linear variation with ∂1S/∂y = +0.10 mm s−1 up to [Formula: see text] followed by a plateau at [Formula: see text], up to the structural stability limit at [Formula: see text]. This is in disagreement with recent ab initio calculations, however, the increase at [Formula: see text] is in quantitative agreement with an older modified tight-binding approach in which the increase arises from an atomic volume dependence. The plateau is an anomaly that sets in at the same composition as that at which the saturation moments start to deviate from the Slater–Pauling curve.

TEM Studies Of Devitrification Products in Al-Gd-Ni-(Fe) Alloys.

2003 ◽  
Vol 806 ◽  
Author(s):  
A. L. Vasiliev ◽  
M. Aindow ◽  
M. J. Blackburn ◽  
T. J. Watson
Keyword(s):  
Electron Microscopy ◽  
Metallic Glasses ◽  
Rhombohedral Phase ◽  
Face Centered Cubic ◽  
Ni Alloys ◽  
Transmission Electron ◽  
Present Complex ◽  
Fe Alloys ◽  
Face Centered ◽  
Complex Faulting

ABSTRACTMetallic glasses can form in certain Al-Gd-Ni alloys. Devitrificaion occurs on subsequent heating to intermediate temperatures and although some phases form as expected the crystal structures of others are less certain. This paper presents a summary of transmission electron microscopy (TEM) data acquired from four devitrified Al-Gd-Ni(-Fe) alloys. It is shown that the alloys exhibit nanocrystalline microstructures consisting of face-centered-cubic α-Al, binary Al3Gd, and ternary phases. An Al-(Gd,Fe)-Ni phase forms as rods and exhibits the orthorhombic Al19Ni5Gd3 structure. Plates of the rhombohedral phase Al23(Ni,Fe)6Gd4 are also present. Complex faulting is observed in both ternary phases.

Effect of Cobalt Concentration on the Microstructure of Nickel-Cobalt Alloy Deposits

2014 ◽  
Vol 887-888 ◽  
pp. 749-752 ◽  
Author(s):  
Yusrini Marita ◽  
Ridwan
Keyword(s):  
Copper Substrate ◽  
Face Centered Cubic ◽  
X Ray Diffraction ◽  
Cobalt Alloy ◽  
Cobalt Sulfate ◽  
X Ray ◽  
Ni Alloys ◽  
Nickel Cobalt ◽  
Face Centered ◽  
Co Alloys

Nickel-cobalt alloy deposits were prepared on copper substrate by electrochemical deposition at various cobalt concentrations in electrolytic solution of 0, 6, 12, 18 and 24 g l-1. The deposition was performed at current density of 30 mA/cm2. X-ray diffraction measurements confirmed that all nickel-cobalt alloy films formed have face-centered cubic structure. EDS studies showed that Co content in Ni-Co alloys increased with the increase of cobalt sulfate concentration in the solution. It can be suggested that increasing concentration of co sulfate is the reason for an increase in activity of cobalt ion. The investigations on the electrodeposited Co-Ni alloys have been shown that their microstructure and surface morphology were found to depend strongly on the Co content in the Ni-Co alloy deposited.

scholarly journals Nanoscale twinning in Fe–Mn–Al–Ni martensite: a backscatter Kikuchi diffraction study

2021 ◽  
Vol 54 (1) ◽  
Author(s):  
Peter D. B. Fischer ◽  
Stefan Martin ◽  
Alexander Walnsch ◽  
Martin Thümmler ◽  
Mario J. Kriegel ◽  
...  
Keyword(s):  
Martensitic Transformation ◽  
Shape Memory ◽  
Diffraction Study ◽  
Face Centered Cubic ◽  
Ni Alloys ◽  
Heat Treated ◽  
Iron Based ◽  
Face Centered ◽  
Ice Water ◽  
Interstitial Elements

Iron-based Fe–Mn–Al–Ni shape-memory alloys are of rather low materials cost and show remarkable pseudoelastic properties. To further understand the martensitic transformation giving rise to the pseudoelastic properties, different Fe–Mn–Al–Ni alloys have been heat treated at 1473 K and quenched in ice water. The martensite, which is formed from a body-centred cubic austenite, is commonly described as face-centered cubic (f.c.c.), even though there are also more complex, polytypical descriptions of martensite. The presently studied backscatter Kikuchi diffraction (BKD) patterns have been evaluated, showing a structure more complex than simple f.c.c. This structure can be described by nanoscale twins, diffracting simultaneously in the exciting volume. The twinned structure shows a tetragonal distortion, not uncommon for martensite in spite of the lack of interstitial elements. These features are evaluated by comparing the measured BKD patterns with dynamically simulated ones.

Thermodynamic properties of the Cu–Au system using a face-centered-cubic lattice model with a renormalized potential

2004 ◽  
Vol 120 (19) ◽  
pp. 9297-9301 ◽  
Author(s):  
Ryoji Sahara ◽  
Hiroshi Ichikawa ◽  
Hiroshi Mizuseki ◽  
Kaoru Ohno ◽  
Hiroshi Kubo ◽  
...  
Keyword(s):  
Thermodynamic Properties ◽  
Lattice Model ◽  
Face Centered Cubic ◽  
Cubic Lattice ◽  
Face Centered

Molybdenum effect on Fe–Cr–Ni-alloy elastic constants

1988 ◽  
Vol 3 (1) ◽  
pp. 40-44 ◽  
Author(s):  
H. M. Ledbetter ◽  
S. A. Kim
Keyword(s):  
Bulk Modulus ◽  
Elastic Constants ◽  
Poisson Ratio ◽  
Face Centered Cubic ◽  
Electron Theory ◽  
Shear Moduli ◽  
Ni Alloys ◽  
Ni Alloy ◽  
Face Centered ◽  
Mo Content

This study involved the ultrasonic measurement of the polycrystalline elastic constants of six face-centered-cubic Fe–Cr–Ni alloys, nominally Fe–19Cr–12Ni (at. %). In these alloys, Mo content ranged up to 2.4 at. %. Molybdenum lowers the Young and shear moduli, and it raises the Poisson ratio. Against expectation (because it increases volume), Mo raises the bulk modulus. Qualitatively, the results show that Ni raises the bulk modulus and Poisson ratio; but Ni lowers the Young and shear moduli. (Nickel decreases the alloy's atomic volume.) The discussion includes existing models based on 3d-electron theory.

scholarly journals Phase transitions and thermodynamic properties of the antiferromagnetic Potts model on a face-centered cubic lattice

2018 ◽  
Vol 185 ◽  
pp. 11008
Author(s):  
Albert Babaev ◽  
Akai Murtazaev ◽  
Felix Kassan-Ogly ◽  
Alexey Proshkin
Keyword(s):  
Monte Carlo ◽  
Phase Transitions ◽  
Thermodynamic Properties ◽  
Potts Model ◽  
Magnetic Moments ◽  
Face Centered Cubic ◽  
Magnetic Structures ◽  
Cubic Lattice ◽  
Face Centered ◽  
Binder Cumulant

Using the Monte Carlo method we investigate the phase transitions and thermodynamic properties of magnetic structures with noncollinear directions of magnetic moments corresponded to antiferromagnetic q=4 Potts model on a face-centered cubic lattice. Monte Carlo simulations are performed on lattices with linear sizes L=20÷44. Thermodynamic parameters: the order parameter mAF, susceptibility χ, internal energy U, and specific heat C are evaluated for all studied systems. By employing the fourth order Binder cumulant method, a first order transition is shown to be occurred in the model.

First-principles study of phase stability, elastic and thermodynamic properties of AlCrFeNi medium-entropy alloys

2020 ◽  
Vol 34 (25) ◽  
pp. 2050218
Author(s):  
Zhiqin Wen ◽  
Zhengguang Zou ◽  
Shuchao Zhang ◽  
Yuhong Zhao
Keyword(s):  
Thermodynamic Properties ◽  
Phase Stability ◽  
First Principles ◽  
Elastic Anisotropy ◽  
Elastic Stiffness ◽  
Face Centered Cubic ◽  
Volume Deformation ◽  
Random Structures ◽  
Face Centered ◽  
Ductile Behavior

We have applied the first-principles method to predict the phase stability, elastic and thermodynamic properties of ternary (AlCrFe, AlCrNi, CrFeNi and AlFeNi) and quaternary (AlCrFeNi) medium-entropy alloys (MEAs). Both body-centered cubic (BCC) and face-centered cubic (FCC) disordered structures are described using the special quasi-random structures (SQSs) technique. AlCrFe, AlCrNi and AlCrFeNi are favorable in single BCC structures, while CrFeNi is likely to form a single FCC structure. Addition of Ni help stabilizes AlCrFeNi quaternary MEAs. Al and Cr addition are in favor of the formation of BCC AlCrFeNi. Addition of Al, Cr and Ni reduce the resistance to volume deformation for quaternary AlCrFeNi due to the effect of the average number of [Formula: see text]-electrons. The ternary MEAs have better resistance to shear deformation and elastic stiffness than quaternary AlCrFeNi. In addition, all the considered MEAs embody elastic anisotropy and AlCrFeNi are predicted to be ductile behavior. Finally, volumetric thermal expansion coefficient, constant volume heat capacity, vibrational and electronic entropy, and Helmholtz free energies of stable BCC AlCrFeNi, BCC AlCrFe, BCC AlCrNi and FCC CrFeNi are calculated using the Debye–Grüneisen model in temperature ranging from 0 to 1200 K to elucidate the relationships between thermodynamic parameters and temperature.

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