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.

Poisson's Ratio for Central-Force Polycrystals

1976 ◽  
Vol 31 (12) ◽  
pp. 1539-1542 ◽  
Author(s):  
H. M. Ledbetter
Keyword(s):  
Electron Energy ◽  
Poisson Ratio ◽  
The Body ◽  
Central Force ◽  
Face Centered Cubic ◽  
Polycrystalline Aggregate ◽  
Body Centered Cubic ◽  
The Face ◽  
Predicted Values ◽  
Face Centered

Abstract The Poisson ratio υ of a polycrystalline aggregate was calculated for both the face-centered cubic and the body-centered cubic cases. A general two-body central-force interatomatic potential was used. Deviations of υ from 0.25 were verified. A lower value of υ is predicted for the f.c.c. case than for the b.c.c. case. Observed values of υ for twenty-three cubic elements are discussed in terms of the predicted values. Effects of including volume-dependent electron-energy terms in the inter-atomic potential are discussed.

Elastic constants of inflated lobes of dog lungs

1976 ◽  
Vol 40 (4) ◽  
pp. 508-513 ◽  
Author(s):  
S. J. Lai-Fook ◽  
T. A. Wilson ◽  
R. E. Hyatt ◽  
J. R. Rodarte
Keyword(s):  
Bulk Modulus ◽  
Young’S Modulus ◽  
Elastic Constants ◽  
Young's Modulus ◽  
Poisson Ratio ◽  
Inflation Pressure ◽  
Initial State ◽  
Volume Curve ◽  
Pressure Volume Curve ◽  
Indentation Tests

The elastic constants of dog lungs were determined at various degrees of inflation. In one set of experiments, the lobes were subjected to deformations that approximated the conditions of uniaxial loading. These data, together with the bulk modulus data obtained from the local slope of the pressure-volume curve, were used to determine the two elastic moduli that are needed to describe small nonuniform deformations about an initial state of uniform inflation. The bulk modulus was approximately 4 times the inflation pressure, and Young's modulus was approximately 1.5 times the inflation pressure. In a second set of experiments, lobes were subjected to indentation tests using cylindric punches 1–3 cm in diameter. The value for Young's modulus obtained from these data was slightly higher, approximately twice the inflation pressure. These experiments indicate that the lung is much more easily deformable in shear than in dilatation and that the Poisson ratio for the lung is high, approximately 0.43.

Elastic constants of face-centered cubic and L12 Ni-Si alloys: Composition and temperature dependence

2003 ◽  
Vol 34 (9) ◽  
pp. 1863-1868 ◽  
Author(s):  
S. V. Prikhodko ◽  
Y. Ma ◽  
A. J. Ardell ◽  
D. G. Isaak ◽  
J. D. Carnes ◽  
...  
Keyword(s):  
Temperature Dependence ◽  
Elastic Constants ◽  
Face Centered Cubic ◽  
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.

Grain Growth and Mechanical Properties of Nanograined Bulk Fe-25Ni Alloy

2005 ◽  
Vol 475-479 ◽  
pp. 3459-3462
Author(s):  
Hong Bin Wang ◽  
Xiao Yu Wang ◽  
J.H. Zhang ◽  
T.Y. Hsu
Keyword(s):  
Mechanical Properties ◽  
Grain Growth ◽  
Coarse Grained ◽  
Growth Exponent ◽  
Face Centered Cubic ◽  
X Ray Diffraction ◽  
Ni Alloy ◽  
Face Centered ◽  
Fcc Phase

The grain growth and mechanical properties of nanograined bulk Fe-25at%Ni alloy prepared by an inert gas condensation and in-situ warm consolidation technique were investigated. About 43% high temperature face-centered-cubic (FCC) phase and 57% low temperature body-centered-cubic (BCC) phase were observed in the sample at room temperature, which was significantly different from that of the corresponding conventional coarse-grained alloy. The in-situ X-ray diffraction results show that the start and the finish temperature of BCC to FCC phase transformation are 450°C and 600°C, respectively. The isothermal grain growth exponent n from t k D D n n ¢ = − 1 0 1 for nanograined single FCC phase Fe-25at%Ni alloy is 0.38 at 750 °C . The mechanical properties changing with the grain size were studied by means of microindentation test.

scholarly journals Effect of Molybdenum Additives on Corrosion Behavior of (CoCrFeNi)100−xMox High-Entropy Alloys

Entropy ◽  
2018 ◽  
Vol 20 (12) ◽  
pp. 908 ◽  
Author(s):  
Wenrui Wang ◽  
Jieqian Wang ◽  
Honggang Yi ◽  
Wu Qi ◽  
Qing Peng
Keyword(s):  
Corrosion Behavior ◽  
Compressive Strain ◽  
Compressive Yield Strength ◽  
High Entropy Alloys ◽  
Face Centered Cubic ◽  
Σ Phase ◽  
High Entropy ◽  
Passivation Film ◽  
Face Centered ◽  
Mo Content

The present work investigates the influence of micro-alloyed Mo on the corrosion behavior of (CoCrFeNi)100−xMox high-entropy alloys. All of the (CoCrFeNi)100−xMox alloys exhibit a single face-centered cubic (FCC) solid solution. However, the (CoCrFeNi)97Mo3 alloy exhibits an ordered sigma (σ) phase enriched in Cr and Mo. With the increase of x (the Mo content) from 1 to 3, the hardness of the (CoCrFeNi)100−xMox alloys increases from 124.8 to 133.6 Vickers hardness (HV), and the compressive yield strength increases from 113.6 MPa to 141.1 MPa, without fracture under about a 60% compressive strain. The potentiodynamic polarization curve in a 3.5% NaCl solution indicates that the addition of Mo has a beneficial effect on the corrosion resistance to some certain extent, opposed to the σ phase. Furthermore, the alloys tend to form a passivation film in the 0.5 M H2SO4 solution in order to inhibit the progress of the corrosion reaction as the Mo content increases.

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.

Elastic constants of face-centered-cubic cobalt

1999 ◽  
Vol 86 (11) ◽  
pp. 6005-6009 ◽  
Author(s):  
J. Gump ◽  
Hua Xia ◽  
M. Chirita ◽  
R. Sooryakumar ◽  
M. A. Tomaz ◽  
...  
Keyword(s):  
Elastic Constants ◽  
Face Centered Cubic ◽  
Face Centered
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