scholarly journals Mathematical model of high-temperature melt flow with account for short-range order nature

2019 ◽  
Vol 94 (2) ◽  
pp. 22-28
Author(s):  
S.N. Shaltakov ◽  
◽  
S.Sh. Kazhikenova ◽  
B.R. Nussupbekov ◽  
D.Zh. Karabekova ◽  
...  
Keyword(s):  
Mathematical Model ◽  
High Temperature ◽  
Short Range ◽  
Short Range Order ◽  
Range Order ◽  
Melt Flow

HREM and Image Simulation of Short-Range-Order Domains in Ion Irradiated Zirconolite

2000 ◽  
Vol 6 (S2) ◽  
pp. 392-393
Author(s):  
S. X. Wang ◽  
L. M. Wang ◽  
R. C. Ewing
Keyword(s):  
High Temperature ◽  
Critical Temperature ◽  
Temperature Dependence ◽  
Short Range ◽  
Radiation Effects ◽  
Short Range Order ◽  
Fluorite Structure ◽  
Range Order ◽  
Image Simulation ◽  
Ion Species

Zirconolite (CaZrTi2O7) is an important phase proposed for immobilization of plutonium. Radiation effects in zirconolite were studied by 1 MeV Kr+ and 1.5 MeV Xe+ irradiation at various temperatures. Zirconolite became amorphous at temperatures below a critical temperature, Tc. The critical temperature was found to be a function of ion species: Tc - 654 K for 1 MeV Kr+ and 710 K for 1.5 MeV Xe+. The temperature dependence of amorphization dose is shown in FIG. 1. Above Tc, the specimen remained crystalline after prolonged irradiation (up to 3.6×l015 ions/cm2). However, the high-temperature irradiated zirconolite was transformed into the fluorite structure (as shown by the strong diffraction maxima in FIG. 2). In addition to the maxima from the fluorite structure, strong diffuse maxima were observed surrounding the Bragg position of pyrochlore superlattice (FIG. 2).

Determination of Short Range Order Parameters in 62Ni0.765Fe0.235 At 600°C Effect of a Quench

1982 ◽  
Vol 21 ◽  
Author(s):  
S. Lefebvre ◽  
F. Bley ◽  
P. Cenedese
Keyword(s):  
High Temperature ◽  
Long Range ◽  
Short Range ◽  
Room Temperature ◽  
Short Range Order ◽  
Range Order ◽  
Local Order ◽  
Long Range Order ◽  
Pair Potentials

ABSTRACTDifferent states of local order have been previously measured at room temperature on water quenched crystal of Ni0.76562 Fe0.235 [1−2]. The Cowley' parameters and the interaction pair potentials in a Clapp and floss approximation have been determined at : 385° C, 470°C, 507°C, 535°C, 685°C that is under and above Tc which is equal to 500°C for this composition.The kinetic of long range order establishment is, in this alloy, very sluggish even near Tc [3]; the kinetic of short range order (SRO) is completely different and may be more complex [4]. In the previous experiments it has been supposed that the state of high temperature was retained during the quench. The following experiments check this hypothesis.

A containerless study of short-range order in high-temperature Fe–Si–Al–Ca–Mg–Cr–Cu–Ni oxide systems

2012 ◽  
Vol 1019 ◽  
pp. 151-158 ◽  
Author(s):  
G.S.E. Antipas ◽  
L. Temleitner ◽  
K. Karalis ◽  
S. Kohara ◽  
L. Pusztai ◽  
...  
Keyword(s):  
High Temperature ◽  
Short Range ◽  
Short Range Order ◽  
Range Order ◽  
Oxide Systems ◽  
Ni Oxide

scholarly journals High-temperature short-range order in Mn3RhSi

2020 ◽  
Vol 1 (1) ◽  
Author(s):  
Hiroki Yamauchi ◽  
Dita Puspita Sari ◽  
Isao Watanabe ◽  
Yukio Yasui ◽  
Lieh-Jeng Chang ◽  
...  
Keyword(s):  
High Temperature ◽  
Short Range ◽  
Short Range Order ◽  
Range Order

scholarly journals A Comparative Study of Short Range Order in Fe-Cr and Fe-V Alloys Around Equiatomic Composition

1990 ◽  
Vol 213 ◽  
Author(s):  
P.E.A. Turchi ◽  
M. Sluiter ◽  
G. M. Stocks
Keyword(s):  
High Temperature ◽  
First Principles ◽  
Driving Force ◽  
Short Range ◽  
Short Range Order ◽  
Electronic Band Structure ◽  
Range Order ◽  
Ordered Structure ◽  
Structure Approach ◽  
Electronic Band

ABSTRACTConfigurational energies have been calculated for equiatomic Fe-Cr and Fe-V alloys possessing the high temperature bcc crystalline structure, within a first principles electronic band structure approach. In agreement with experimental facts, a tendency towards order, with a B2 ordered structure of CsCI type, is found for FeV whereas phase separation characterizes FeCr. These results suggest that the nature of short range order in the high temperature bcc solid solution is not the primary driving force for describing the structural transformation from bcc to sigma which takes place in both alloys upon decreasing temperature.

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