Formation of virtual ordered states along a phase-decomposition path

1991 ◽  
Vol 44 (9) ◽  
pp. 4681-4684 ◽  
Author(s):  
Long-Qing Chen ◽  
A. G. Khachaturyan
Keyword(s):  
Phase Decomposition ◽  
Decomposition Path

Transient ordered phases with different structure types along a phase-decomposition path

1999 ◽  
Vol 59 (1) ◽  
pp. 16-19 ◽  
Author(s):  
Zhi-Rong Liu ◽  
Bing-Lin Gu ◽  
Hong Gui ◽  
Xiao-Wen Zhang
Keyword(s):  
Phase Decomposition ◽  
Ordered Phases ◽  
Decomposition Path

Direct observations of radiation-enhanced transformations in glass

1983 ◽  
Vol 41 ◽  
pp. 354-355
Author(s):  
J. F. DeNatale ◽  
D. G. Howitt
Keyword(s):  
Glass Matrix ◽  
Diffusion Mechanism ◽  
Bubble Formation ◽  
Silicate Glasses ◽  
Phase Decomposition ◽  
Direct Observations ◽  
Thin Foils ◽  
Oxygen Bubble ◽  
Electron Energy Loss ◽  
Kinetics Of

The electron irradiation of silicate glasses containing metal cations produces various types of phase separation and decomposition which includes oxygen bubble formation at intermediate temperatures figure I. The kinetics of bubble formation are too rapid to be accounted for by oxygen diffusion but the behavior is consistent with a cation diffusion mechanism if the amount of oxygen in the bubble is not significantly different from that in the same volume of silicate glass. The formation of oxygen bubbles is often accompanied by precipitation of crystalline phases and/or amorphous phase decomposition in the regions between the bubbles and the detection of differences in oxygen concentration between the bubble and matrix by electron energy loss spectroscopy cannot be discerned (figure 2) even when the bubble occupies the majority of the foil depth.The oxygen bubbles are stable, even in the thin foils, months after irradiation and if van der Waals behavior of the interior gas is assumed an oxygen pressure of about 4000 atmospheres must be sustained for a 100 bubble if the surface tension with the glass matrix is to balance against it at intermediate temperatures.

Transmission Electron Microscopic Observations of Al3Li and Al3Ti Precipitation in A Rapidly Solidified Al-3Li-0.2Ti ALLOY

1980 ◽  
Vol 38 ◽  
pp. 336-337
Author(s):  
J. E. O’Neal ◽  
K. K. Sankaran ◽  
S. M. L. Sastry
Keyword(s):  
Rapid Solidification ◽  
Metallic Substrate ◽  
Deformation Characteristics ◽  
Phase Decomposition ◽  
Electron Microscopic ◽  
Transmission Electron ◽  
Supersaturated Solid Solutions ◽  
Transmission Electron Microscopic ◽  
Rapidly Solidified ◽  
Microstructural Homogeneity

Rapid solidification of a molten, multicomponent alloy against a metallic substrate promotes greater microstructural homogeneity and greater solid solubility of alloying elements than can be achieved by slower-cooling casting methods. The supersaturated solid solutions produced by rapid solidification can be subsequently annealed to precipitate, by controlled phase decomposition, uniform 10-100 nm precipitates or dispersoids. TEM studies were made of the precipitation of metastable Al3Li(δ’) and equilibrium AL3H phases and the deformation characteristics of a rapidly solidified Al-3Li-0.2Ti alloy.

Fundamental Studies of Beta Phase Decomposition Modes in Titanium Alloys.

1988 ◽  
Author(s):  
H. I. Aaronson ◽  
A. M. Dalley ◽  
T. Furuhara ◽  
Y. Mou
Keyword(s):  
Titanium Alloys ◽  
Beta Phase ◽  
Phase Decomposition

Phase Constitution and Transformation Behavior of Ni2MnGa-Cu2MnAl Pseudobinary Intermetallic Compounds

2005 ◽  
Vol 475-479 ◽  
pp. 841-844 ◽  
Author(s):  
Hideki Hosoda ◽  
Yuji Higaki ◽  
Shuichi Miyazaki
Keyword(s):  
Continuous Solid Solution ◽  
Lattice Parameter ◽  
The Other ◽  
Phase Decomposition ◽  
Martensitic Transformation Temperature ◽  
Transformation Behavior ◽  
Solution Hardening ◽  
Phase Constitution ◽  
Heat Treated ◽  
Curie Temperature Tc

The phase constitution, lattice parameter, martensitic and magnetic transformation behavior and hardness of the Ni2MnGa-Cu2MnAl pseudobinary alloys designed as (Ni2MnGa)x(Cu2MnAl)1-x were investigated in order to improve magnetic properties of Ni2MnGa. It was revealed that L21 Ni2MnGa and Cu2MnAl make a continuous solid solution of (Ni,Cu)2Mn(Ga,Al) when heat treated at 1073K, and that the lattice parameter of the L21 phase increases monotonously with increasing the compositional ratio x, that is, the amount of Cu2MnAl. Curie temperature TC also increases with increasing x. On the other hand, the martensitic transformation temperature of Ni2MnGa seems to decrease rapidly by adding Cu2MnAl. Hardness of the alloys heat-treated at 1073K ranges from HV200 to HV370, and solution hardening was recognized by mixing. When heat treated at 773K, a phase decomposition from L21 phase to Cu9Al4 and b-Mn was confirmed in the Cu2MnAl-rich alloys. The phase decomposition causes a decrease in the lattice parameter of L21 phase and TC and a significant increase in hardness.

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