The effects of the minority phase on phase separation in Fe–Sn hypermonotectic alloy

2013 ◽  
Vol 555 ◽  
pp. 88-94 ◽  
Author(s):  
L. Zhou ◽  
N. Wang ◽  
L. Zhang ◽  
W.J. Yao
Keyword(s):  
Phase Separation ◽  
Minority Phase ◽  
Hypermonotectic Alloy

scholarly journals Liquid Phase Separation Mechanism of Cu-40 wt.% Pb Hypermonotectic Alloys

2018 ◽  
Vol 2018 ◽  
pp. 1-5
Author(s):  
Xiaosi Sun ◽  
Weixin Hao ◽  
Teng Ma ◽  
Junting Zhang ◽  
Guihong Geng
Keyword(s):  
Phase Separation ◽  
Liquid Phase ◽  
Ostwald Ripening ◽  
Liquid Phase Separation ◽  
Separation Mechanism ◽  
Leading Role ◽  
Miscibility Gaps ◽  
Solidification Microstructures ◽  
Hypermonotectic Alloy ◽  
Phase Separation Mechanism

Solidification microstructures of Cu-40 wt.% Pb alloy were examined under different undercooling degrees. The liquid phase separation mechanism in the systems with stable miscibility gaps mainly involved Ostwald ripening, Brownian motion, Marangoni migration, and Stokes motion. Stokes had little influence on the liquid phase separation in the early phase and played a leading role in the later period. The liquid phase separation mechanism of Cu-40 wt.% Pb hypermonotectic alloy was illustrated in detail.

Phase Separation Studies of Confined Thin Film Polymer Blends

1994 ◽  
Vol 366 ◽  
Author(s):  
Q. Pan ◽  
R. J. Composto
Keyword(s):  
Phase Separation ◽  
Film Thickness ◽  
Volume Fraction ◽  
Film Plane ◽  
Morphological Development ◽  
Vinyl Methyl Ether ◽  
Glass Slides ◽  
Minority Phase ◽  
Phase Separation Kinetics ◽  
Film Polymer

ABSTRACTUsing video-optical microscopy and image analysis software, the morphological development of phase separation of polystyrene (PS) and poly(vinyl methyl ether) (PVME) blends is monitored for film thickness ranging from 200 to 700nm's. In the current studies, films are confined between glass slides. For blends having a PS volume fraction of 0.30 (the critical composition), the area fraction of the PS-rich minority phase, A, decreases more rapidly as film thickness decreases. At long times, the final A achieves a constant value which is less than the bulk value. The correlation length of concentration fluctuations increases more rapidly than the bulk scaling prediction, which suggests that wetting plays a significant role in the phase separation kinetics of thin films. Because of confinement, the shape of the PS-rich phase is anisotropic, flattened along the film direction. The confinement restricts the phase growth perpendicular to the film plane, and thus hinders the development of phase separation at very late stages.

Phase Separation Kinetics During Drying

1996 ◽  
Vol 461 ◽  
Author(s):  
R. F. Saraf ◽  
S. Ostrander ◽  
R. M. Feenstra
Keyword(s):  
Phase Separation ◽  
Master Curve ◽  
Growth Exponent ◽  
Polymer Mixture ◽  
Initial Condition ◽  
Initial Concentration ◽  
Binary Polymer ◽  
Minority Phase ◽  
Phase Separation Kinetics ◽  
Kinetics Of

AbstractKinetics of phase separation at air/polymer interface in a binary polymer mixture on evaporation of common solvent is studied. The lateral dimension of the highly anisotropie, pancake-like, minority phase increases with a growth exponent of 2/3 identical to ‘late-stage’ growth under (classical) thermal-quench at interface. In contrast to the thermal-quench, during drying the kinetics depends on the initial condition (i.e., initial concentration, Co) that is rescaled to obtain a master-curve.

Antiferromagnetism and onset of Superconductivity in Lanthanum Nickelates

1989 ◽  
Vol 156 ◽  
Author(s):  
J. Spałek ◽  
Z. Kakol ◽  
J. M. Honig
Keyword(s):  
Phase Separation ◽  
Magnetic Moment ◽  
Ground State ◽  
Phase 1 ◽  
Structural Phase ◽  
Resistivity Measurements ◽  
Minority Phase

ABSTRACTMagnetic moment and resistivity measurements are summarized for the La2−xSrxNiO4 system. They show that the system undergoes a structural phase separation below 70 K. The majority of the sample is antiferromagnetic (AF) below 650 K (for x = 0) or 20 K (for x = 0) or 20 K (for x ≃ 0.2 while the minority phase (≤1% at 4.2 K) is superconducting (SC). An analysis of the results leads to the conclusion that SC and AF coexist in the minority part of the sample; the pairing takes place between 2p holes which propagate through a lattice containing localized 3d moments which, in the ground state, are ordered antiferromagnetically.

A Homogeneous Solidification Criterion for Undercooled Ni-20at%Pb Hypermonotectic Melts

2011 ◽  
Vol 695 ◽  
pp. 340-343
Author(s):  
Hui Xie ◽  
Gen Cang Yang ◽  
Lei Jia ◽  
Zhen Lin Lu
Keyword(s):  
Phase Separation ◽  
Liquid Phase ◽  
Cooling Rate ◽  
Nucleation Rate ◽  
Volume Fraction ◽  
Liquid Phase Separation ◽  
Homogeneous Microstructure ◽  
Nucleation Barrier ◽  
Hypermonotectic Alloy ◽  
Liquid Liquid Phase Separation

The kinetic process of liquid-liquid phase separation in the undercooled Ni-20at%Pb hypermonotectic alloy melts was analyzed theoretically. The results showed that liquid-liquid separation could not be inhibited due to smaller nucleation barrier and bigger nucleation rate of Pb-rich droplets. In the course of liquid-liquid phase separation, the volume fraction of Pb-rich droplets was thought as a function of time or temperature. At a certain cooling rate, the volume fraction was mainly controlled by the undercooling of Ni-Pb hypermonotectic melts. Based on the above results, a homogeneous solidification criterion for the undercooled Ni-20at%Pb hypermonotectic alloy melts was developed. Such a criterion predicted that the homogeneous microstructure could be obtained at the undercooling 263K, and the experimental results accorded with the predicting ones on the whole.

Bulk standards for low-temperature biological x-ray microanalysis

1984 ◽  
Vol 42 ◽  
pp. 282-283
Author(s):  
P. Echlin ◽  
M. McKoon ◽  
E.S. Taylor ◽  
C.E. Thomas ◽  
K.L. Maloney ◽  
...  
Keyword(s):  
Phase Separation ◽  
Low Temperature ◽  
Analytical Method ◽  
Salt Solutions ◽  
Absolute Concentration ◽  
Cooling Process ◽  
X Ray ◽  
The Absolute ◽  
Analytical Procedures ◽  
Electrical Conductors

Although sections of frozen salt solutions have been used as standards for x-ray microanalysis, such solutions are less useful when analysed in the bulk form. They are poor thermal and electrical conductors and severe phase separation occurs during the cooling process. Following a suggestion by Whitecross et al we have made up a series of salt solutions containing a small amount of graphite to improve the sample conductivity. In addition, we have incorporated a polymer to ensure the formation of microcrystalline ice and a consequent homogenity of salt dispersion within the frozen matrix. The mixtures have been used to standardize the analytical procedures applied to frozen hydrated bulk specimens based on the peak/background analytical method and to measure the absolute concentration of elements in developing roots.

Phase separation in sol gel-derived ceramic films of silica-zirconia, alumina-zirconia, and titania-zirconia system

1994 ◽  
Vol 52 ◽  
pp. 646-647
Author(s):  
J. Tong ◽  
L. Eyring
Keyword(s):  
Fracture Toughness ◽  
Phase Separation ◽  
Sol Gel ◽  
Great Influence ◽  
High Strength ◽  
Chemical Durability ◽  
Separation Method ◽  
Toughening Mechanism ◽  
Ceramic Films ◽  
Zirconia Toughened Alumina

There is increasing interest in composites containing zirconia because of their high strength, fracture toughness, and its great influence on the chemical durability in glass. For the zirconia-silica system, monolithic glasses, fibers and coatings have been obtained. There is currently a great interest in designing zirconia-toughened alumina including exploration of the processing methods and the toughening mechanism.The possibility of forming nanocrystal composites by a phase separation method has been investigated in three systems: zirconia-alumina, zirconia-silica and zirconia-titania using HREM. The morphological observations initially suggest that the formation of nanocrystal composites by a phase separation method is possible in the zirconia-alumina and zirconia-silica systems, but impossible in the zirconia-titania system. The separation-produced grain size in silica-zirconia system is around 5 nm and is more uniform than that in the alumina-zirconia system in which the sizes of the small polyhedron grains are around 10 nm. In the titania-zirconia system, there is no obvious separation as was observed in die alumina-zirconia and silica-zirconia system.

Phase separation in fluid additive hard sphere mixtures?

1998 ◽  
Vol 95 (2) ◽  
pp. 131-135 ◽  
Author(s):  
DOUGLAS HENDERSON DEZSO BODA KWONG-YU CHAN
Keyword(s):  
Phase Separation ◽  
Hard Sphere

The plant response to heat requires phase separation

Nature ◽  
2020 ◽  
Vol 585 (7824) ◽  
pp. 191-192 ◽  
Author(s):  
Simon Alberti
Keyword(s):  
Phase Separation ◽  
Plant Response
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