scholarly journals Invariant plastic deformation mechanism in paramagnetic nickel–iron alloys

2021 ◽  
Vol 118 (14) ◽  
pp. e2023181118
Author(s):  
Zhihua Dong ◽  
Wei Li ◽  
Stephan Schönecker ◽  
Bin Jiang ◽  
Levente Vitos
Keyword(s):  
Plastic Deformation ◽  
High Temperature ◽  
Deformation Mechanism ◽  
Elevated Temperatures ◽  
Face Centered Cubic ◽  
Nickel Iron ◽  
Plastic Deformation Mechanism ◽  
The Face ◽  
Face Centered ◽  
Scientific Attention

The Invar anomaly is one of the most fascinating phenomena observed in magnetically ordered materials. Invariant thermal expansion and elastic properties have attracted substantial scientific attention and led to important technological solutions. By studying planar faults in the high-temperature magnetically disordered state of Ni1−cFec, here we disclose a completely different anomaly. An invariant plastic deformation mechanism is characterized by an unchanged stacking fault energy with temperature within wide concentration and temperature ranges. This anomaly emerges from the competing stability between the face-centered cubic and hexagonal close-packed structures and occurs in other paramagnetic or nonmagnetic systems whenever the structural balance exists. The present findings create a platform for tailoring high-temperature properties of technologically relevant materials toward plastic stability at elevated temperatures.

Crystal dynamics of nickel–iron and copper–zinc alloys

1969 ◽  
Vol 47 (10) ◽  
pp. 1117-1131 ◽  
Author(s):  
E. D. Hallman ◽  
B. N. Brockhouse
Keyword(s):  
Diffraction Method ◽  
Face Centered Cubic ◽  
Frequency Distributions ◽  
Zinc Alloys ◽  
Mean Frequency ◽  
Nickel Iron ◽  
The Face ◽  
Copper Zinc ◽  
Face Centered ◽  
Frequency Ratios

Using inelastic scattering of slow neutrons, the frequency-wavevector dispersion relations for the lattice vibrations in the face-centered cubic alloys Ni3Fe, Ni0.5Fe0.5, Ni0.3Fe0.7, and Cu3Zn have been measured at 296 °K. Measurements were also made at 573 °K for the Ni0.3Fe0.7 alloy. The results for the nickel–iron alloys are very similar to those for nickel, with mean frequency ratios (alloy/nickel) of 0.990, 0.950, 0.953 for the Ni3Fe, Ni0.5Fe0.5, and Ni0.3Fe0.7 alloys respectively. Significant deviations of the limiting slopes of the dispersion curves for Ni0.3Fe0.7 from velocities reported by Alers et al. from ultrasonic measurements are thought to be caused by magnetic contributions which are small at the frequencies measured here. The temperature dependence of the frequencies for Ni0.3Fe0.7 is consistent with that observed for nickel. For Cu3Zn, the results are similar to those for copper; except that the mean frequency ratio (alloy/copper) is 0.932. A neutron diffraction method was used to characterize the homogeneity and composition of the alloys. Born – von Kármán fits to the data, the frequency distributions, and Debye temperature vs. temperature relations are also given.

scholarly journals Ternäre Carbide von Cr, Mo und W mit Platinmetallen / Ternary Carbides of Cr, Mo and W with Platinum Metals

1979 ◽  
Vol 34 (4) ◽  
pp. 647 ◽  
Author(s):  
Helmut Holleck
Keyword(s):  
High Temperature ◽  
Valence Electron ◽  
Platinum Metal ◽  
Valence Electron Concentration ◽  
Face Centered Cubic ◽  
Platinum Metals ◽  
The Face ◽  
Cubic Structure ◽  
Face Centered ◽  
Ternary Carbides

Abstract Ternary high temperature carbides were found in the system Cr-Ru-C, Cr-Rh-C, Cr-Ir-C, Cr-Pt-C, Mo-Ru-C, Mo-Rh-C, Mo-Os-C, Mo-Ir-C, Mo-Pt-C, W-Ru-C, W-Rh-C, W-Os-S and W-Pt-C. The com-pounds crystallize in the face centered cubic structure. The carbon content changes systematically with the content and the valence electron concentration of the respective platinum metal.

Voids in Irradiated Tungsten and Molybdenum

1969 ◽  
Vol 27 ◽  
pp. 190-191
Author(s):  
Robert C. Rau ◽  
Robert L. Ladd
Keyword(s):  
Melting Point ◽  
Fast Neutron ◽  
Neutron Irradiation ◽  
Elevated Temperatures ◽  
Irradiation Temperature ◽  
The Body ◽  
Face Centered Cubic ◽  
Body Centered Cubic ◽  
Cubic Metals ◽  
Face Centered

Recent studies have shown the presence of voids in several face-centered cubic metals after neutron irradiation at elevated temperatures. These voids were found when the irradiation temperature was above 0.3 Tm where Tm is the absolute melting point, and were ascribed to the agglomeration of lattice vacancies resulting from fast neutron generated displacement cascades. The present paper reports the existence of similar voids in the body-centered cubic metals tungsten and molybdenum.

A study of interface sliding at F.C.C.-B.C.C. boundaries in a Cu-Zn alloy

1978 ◽  
Vol 36 (1) ◽  
pp. 422-423
Author(s):  
F. Monchoux ◽  
A. Rocher ◽  
J.L. Martin
Keyword(s):  
Face Centered Cubic ◽  
Creep Tests ◽  
High Voltage Electron Microscopy ◽  
Diffusion Treatment ◽  
Voltage Electron ◽  
The Face ◽  
Face Centered ◽  
Interface Sliding ◽  
Zn Alloy ◽  
Made In

Interphase sliding is an important phenomenon of high temperature plasticity. In order to study the microstructural changes associated with it, as well as its influence on the strain rate dependence on stress and temperature, plane boundaries were obtained by welding together two polycrystals of Cu-Zn alloys having the face centered cubic and body centered cubic structures respectively following the procedure described in (1). These specimens were then deformed in shear along the interface on a creep machine (2) at the same temperature as that of the diffusion treatment so as to avoid any precipitation. The present paper reports observations by conventional and high voltage electron microscopy of the microstructure of both phases, in the vicinity of the phase boundary, after different creep tests corresponding to various deformation conditions.Foils were cut by spark machining out of the bulk samples, 0.2 mm thick. They were then electropolished down to 0.1 mm, after which a hole with thin edges was made in an area including the boundary

NICROFER 5923 HMo-ALLOY 59

Alloy Digest ◽  
1993 ◽  
Vol 42 (5) ◽  
Keyword(s):  
Corrosion Resistance ◽  
High Temperature ◽  
Physical Properties ◽  
Heat Treating ◽  
Face Centered Cubic ◽  
Low Carbon ◽  
High Alloy ◽  
Temperature Performance ◽  
Cubic Structure ◽  
Face Centered

Abstract NICROFER 5923 hMo, often called Alloy 59, was developed with extra low carbon and silicon contents and with a high alloy level of molybdenum to optimize its corrosion resistance. Nicrofer 5923hMo has a face-centered cubic structure. This datasheet provides information on composition, physical properties, elasticity, and tensile properties. It also includes information on high temperature performance as well as forming, heat treating, and joining. Filing Code: Ni-430. Producer or source: VDM Technologies Corporation.

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