Metastable Phases of Rapidly Solidified Al-Rich Al-Fe Alloys

1984 ◽  
Author(s):  
D. Schechtman ◽  
E. Horowitz
Keyword(s):  
Metastable Phases ◽  
Fe Alloys ◽  
Rapidly Solidified

Formation of metastable phases and nanocomposite structures in rapidly solidified Al–Fe alloys

2011 ◽  
Vol 528 (18) ◽  
pp. 5967-5973 ◽  
Author(s):  
S.S. Nayak ◽  
H.J. Chang ◽  
D.H. Kim ◽  
S.K. Pabi ◽  
B.S. Murty
Keyword(s):  
Metastable Phases ◽  
Fe Alloys ◽  
Rapidly Solidified ◽  
Nanocomposite Structures

Metastable Phases in Rapidly Solidified Aluminum-Rich Al-Fe Alloys

1982 ◽  
Vol 19 ◽  
Author(s):  
D. Shechtman ◽  
L.J. Swartzendruber
Keyword(s):  
Electron Microscopy ◽  
Heat Treatment ◽  
Melt Spinning ◽  
Gamma Ray ◽  
Resonance Spectrum ◽  
Metastable Phase ◽  
Metastable Phases ◽  
Transmission Electron ◽  
Fe Alloys ◽  
Rapidly Solidified

ABSTRACTAluminum-rich Al-Fe binary alloys up to and including Al3Fe were prepared by melt spinning in order to study the metastable phase structure and its transformation following heat treatment. Transmission electron microscopy and nuclear gamma-ray resonance were utilized in the study. The rapidly solidified structure was found to contain up to three metastable phases. One of the phases, with a composition and a gamma-ray resonance spectrum appropriate for Al6Fe, has either a globular or a cellular morphology upon quenching.

scholarly journals Effect of combined metal-carbon additions on the microstructure and structure of Sm2Fe17

2003 ◽  
Vol 18 (2) ◽  
pp. 279-283 ◽  
Author(s):  
B.E. Meacham ◽  
J.E. Shield
Keyword(s):  
Solute Drag ◽  
Type Structure ◽  
Drag Effect ◽  
Microstructural Refinement ◽  
Atomic Size ◽  
Alloying Additions ◽  
Grain Structures ◽  
Fe Alloys ◽  
Rapidly Solidified ◽  
Carbon Additions

The effect of combined alloying additions on the structure and scale of rapidly solidified Sm–Fe alloys was investigated. Transition metal additions tend to promote the formation of the disordered TbCu7-type structure in Sm2Fe17 alloys, as determined by monitoring the long-range order parameter. Essentially no order was observed for M = Ti, Zr, V, or Nb. Thus, the structure was close to the prototypical TbCu7-type structure. With M = Si, a large amount of order was observed (S = 0.62), resulting in a structure closer to the well-ordered Th2Zn17-type. The microstructural scale was also affected by alloying. In this case, refinement depended on the substituent and also on carbon for microstructural refinement. The scale of the as-solidified grain structures ranged from 100 nm for SiC-modified alloys to 13 nm for NbC-modified alloys. The degree of refinement was directly related to the atomic size of the M addition. The refinement was the result of solute partitioning to grain boundaries, resulting in a solute drag effect that lowered the growth rates.

Microstructure of Rapidly Solidified Cu-Fe Alloys

1983 ◽  
Vol 28 ◽  
Author(s):  
Uwe Köster ◽  
Christoph Caesar
Keyword(s):  
Cross Sections ◽  
Contact Surface ◽  
Iron Content ◽  
Melt Spinning ◽  
Volume Fraction ◽  
Thermal Contact ◽  
Lattice Parameter ◽  
Good Thermal Contact ◽  
Fe Alloys ◽  
Rapidly Solidified

ABSTRACTRapidly solidified ribbons of Cu-Fe alloys with iron contents up to 20 at.−% have been prepared by melt-spinning. Optical and electron microscopy as well as x-ray and electron diffraction techniques were used to characterize quantitatively the microstructure, i.e., grain size and shape, solubility of iron, lattice parameter, volume fraction and distribution of precipitated iron-particles, etc.Whereas the free surfaces of melt-spun Cu-Fe ribbons have been found to be very smooth, the contact surfaces usually consist of isolated areas of good thermal contact with small equiaxed grains separated by bands without contact during casting and therefore poor heat transfer. The cross sections of the ribbons generally exhibit a strong anisotropy in their microstructure: very fine crystals adjacent to the contact surface develop into narrow columnar grains, generally significantly elongated and extending across the whole section. The average columnar width of the grains has been found to decrease significantly with increasing iron content. Precipitation of iron not only depends on the iron content but also on the distance from the contact surface.

Formation of metastable phases in rapidly solidified Mg32(AlxZn1−x)49 alloys

1994 ◽  
Vol 31 (5) ◽  
pp. 583-588 ◽  
Author(s):  
R. Banerjee ◽  
R.T. Savalia ◽  
N. Prabhu ◽  
D. Prakash ◽  
U.D. Kulkarni ◽  
...  
Keyword(s):  
Metastable Phases ◽  
Rapidly Solidified

Microstructures and phase formation in rapidly solidified Sm–Fe alloys

2003 ◽  
Vol 351 (1-2) ◽  
pp. 106-113 ◽  
Author(s):  
J.E. Shield ◽  
B.B. Kappes ◽  
B.E. Meacham ◽  
K.W. Dennis ◽  
M.J. Kramer
Keyword(s):  
Phase Formation ◽  
Fe Alloys ◽  
Rapidly Solidified

An Automated Laboratory Apparatus for the Production of Rapidly Solidified Submicron Powders

1981 ◽  
Vol 8 ◽  
Author(s):  
Julius Perel ◽  
John F. Mahoney ◽  
Scott Taylor ◽  
Zef Shanfield ◽  
Carlos Levi
Keyword(s):  
Electron Microscope ◽  
Single Crystal ◽  
Liquid State ◽  
Metastable Phases ◽  
Liquid Droplets ◽  
Laboratory Apparatus ◽  
Material Scientist ◽  
Automated Instrument ◽  
Rapidly Solidified

ABSTRACTThe Electrohydrodynamic (EHD) method of spraying fine liquid droplets from a liquid state, in a vacuum environment, was developed and used to produce amorphous, microcrystalline, single crystal, bicrystalline and tricrystalline powders. Studies of these powders have contributed towards increasing the knowledge of extended solubility, nucleation, metastable phases, undercooling effects, etc. Coatings and films have been produced by collecting the liquid droplets before solidification. An automated instrument based upon the EHD method, the Micro-Particle Processor, is computer operated and allows a material scientist not completely acquainted with the EHD process to perform sophisticated experiments on materials of his choosing. Electron transparent powders close to 3μm and large powders up to l00μm have been collected and observed. Cooling rates above 107K/s have been achieved. Applications using powders include: new alloy compositions, use as AEM standards, in-situ remelt experiments in the electron microscope, etc.

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