ANTIFERROMAGNETISM OF THE Fe-Ni ALLOYS IN THE INVAR COMPOSITION

1988 ◽  
Vol 49 (C8) ◽  
pp. C8-303-C8-304
Author(s):  
Y. Tino
Keyword(s):  
Ni Alloys ◽  
Invar Composition

Mössbauer and x-ray study of mechanically alloyed Fe–Ni alloys around the Invar composition

2008 ◽  
Vol 20 (48) ◽  
pp. 485204 ◽  
Author(s):  
J F Valderruten ◽  
G A Pérez Alcázar ◽  
J M Grenèche
Keyword(s):  
Mechanically Alloyed ◽  
X Ray ◽  
Ni Alloys ◽  
Invar Composition

K Absorption Edge Magnetic Circular-X-Ray Dichroism of Fe-Ni Alloys

1997 ◽  
Vol 7 (C2) ◽  
pp. C2-421-C2-424
Author(s):  
K.J. Gofron ◽  
C.W. Kimball ◽  
P.L. Lee ◽  
G. Jennings ◽  
P.A. Montano
Keyword(s):  
Crystal Structure ◽  
Absorption Edge ◽  
Electronic States ◽  
Energy Dispersive ◽  
X Ray ◽  
Ni Alloys ◽  
Ferromagnetic Alloys ◽  
Cold Rolled ◽  
Invar Composition ◽  
Self Reference

We report Magnetic Circular X-ray Dichroism (MCXD) measurements in Fe-Ni alloys. We used an energy dispersive beamline in our measurements. A polychromator spectrum contains self reference both in intensity and energy since all energies are measured at the same time and remain stable during an energy scan since no movement of the X-ray optics is necessary. We measured the K absorption edges in Fe and Ni (s - p electronic states) in the à ferromagnetic alloys of Fe-Ni. We observe that the signal at the invar composition is of comparable strengh as other compositions in contrast to previous studies. We used cold rolled (disordered) foils instead of powders. The measurements reveal changes of the MCXD signal with composition and crystal structure.

Microstructures of Ti-1.5 w/o Ni Alloys with Mo and A1 Additions

1975 ◽  
Vol 33 ◽  
pp. 54-55
Author(s):  
Anna C. Fraker
Keyword(s):  
Corrosion Resistance ◽  
Beneficial Effect ◽  
Crevice Corrosion ◽  
Local Corrosion ◽  
Precipitate Size ◽  
Ni Alloys

Small amounts of nickel are added to titanium to improve the crevice corrosion resistance but this results in an alloy which has sheet fabrication difficulties and is subject to the formation of large Ti2Ni precipitates. These large precipitates can serve as local corrosion sites; but in a smaller more widely dispersed form, they can have a beneficial effect on crevice corrosion resistance. The purpose of the present work is to show that the addition of a small amount of Mo to the Ti-1.5Ni alloy reduces the Ti2Ni precipitate size and produces a more elongated grained microstructure. It has recently been reported that small additions of Mo to Ti-0.8 to lw/o Ni alloys produce good crevice corrosion resistance and improved fabrication properties.

Spherulite Structures in a Melt Spun Fe-Ni Austenitic Steel

1985 ◽  
Vol 43 ◽  
pp. 52-53
Author(s):  
G. M. Michal ◽  
T. K. Glasgow ◽  
T. J. Moore
Keyword(s):  
Austenitic Steel ◽  
Room Temperature ◽  
Elevated Temperatures ◽  
Large Range ◽  
Amorphous Structure ◽  
Nucleation And Growth ◽  
Ni Alloys ◽  
Melt Spun ◽  
Crystal Fibers ◽  
Rapidly Solidified

Large additions of B to Fe-Ni alloys can lead to the formation of an amorphous structure, if the alloy is rapidly cooled from the liquid state to room temperature. Isothermal aging of such structures at elevated temperatures causes crystallization to occur. Commonly such crystallization pro ceeds by the nucleation and growth of spherulites which are spherical crystalline bodies of radiating crystal fibers. Spherulite features were found in the present study in a rapidly solidified alloy that was fully crysstalline as-cast. This alloy was part of a program to develop an austenitic steel for elevated temperature applications by strengthening it with TiB2. The alloy contained a relatively large percentage of B, not to induce an amorphous structure, but only as a consequence of trying to obtain a large volume fracture of TiB2 in the completely processed alloy. The observation of spherulitic features in this alloy is described herein. Utilization of the large range of useful magnifications obtainable in a modern TEM, when a suitably thinned foil is available, was a key element in this analysis.

AEM analysis of solidification catalysts in atomized Fe-Ni

1986 ◽  
Vol 44 ◽  
pp. 584-585
Author(s):  
Matthew R. Libera
Keyword(s):  
Powder Particle ◽  
Alloy Composition ◽  
Particle Diameter ◽  
Metastable Phases ◽  
Liquid Droplets ◽  
Nucleation Kinetics ◽  
Ni Alloys ◽  
Nonequilibrium Solidification

The liquid droplets produced by atomization processes are believed to undergo substantial supercooling during solidification, because the catalytic heterogeneities, for statistical reasons, tend to be isolated in the larger droplets. This supercooling can lead to the nucleation of metastable phases. As part of a study on the effect of liquid supercooling on nonequilibrium solidification, three binary Fe-Ni alloys have been produced by conventional argon atomization (Fe-20Ni, Fe-30Ni, and Fe-40Ni). The primary variables in these experiments are: i) the alloy composition; and ii) the powder particle diameter (inversely proportional to supercooling). Of particular interest in this system is the competitive nucleation kinetics between the stable fee and metastable bec phases. Bcc is expected to nucleate preferentially with decreasing %Ni and decreasing particle diameter.

Phase transformations in Pd-and Ni-rich Ti-Pd-Ni alloys

2003 ◽  
Vol 112 ◽  
pp. 1043-1046 ◽  
Author(s):  
M. Nagasako ◽  
M. Nishida
Keyword(s):  
Phase Transformations ◽  
Ni Alloys

Comparative study of structure and strain diagram changes in Ti-Ni alloys thermomechanically treated in martensitic or austenitic states

2003 ◽  
Vol 112 ◽  
pp. 789-793 ◽  
Author(s):  
S. D. Prokoshkin ◽  
I. Yu. Khmelevskaya ◽  
V. Brailovski ◽  
F. Trochu ◽  
S. Turenne ◽  
...  
Keyword(s):  
Comparative Study ◽  
Strain Diagram ◽  
Ni Alloys
Sign in / Sign up

Export Citation Format

Share Document