scholarly journals Thermal transitions in metastable Cu – 68.5 at. % Co alloy.

2021 ◽  
Author(s):  
Oluwatoyin Enitan Jegede ◽  
Nafisul Haque ◽  
Andrew M. Mullis ◽  
Robert F. Cochrane
Keyword(s):  
Thermal Analysis ◽  
Phase Diagram ◽  
Liquidus Temperature ◽  
Metastable Phase ◽  
Drop Tube ◽  
Metastable Phase Diagram ◽  
Thermal Transitions ◽  
Sieve Size ◽  
Dta Curves ◽  
Size Powder

Arc melted and drop tube processed Cu – 68.5 at. % Co alloy has been subjected to differential thermal analysis (DTA). The liquidus temperature determined from the DTA curves in the arc melt sample (1664 K) was found to be close to phase diagram estimate of 1662 K. In contrast as a result of liquid phase separation in the drop tube samples, the values obtained in the powders were much lower mainly because the compositions of the demixed phases vary from that of the parent melt. The liquidus temperature of the 850 + μm powders was 1632 K while that of the < 38 μm sieve size powder was 1616 K. This variance is due to the asymmetric nature of the metastable phase diagram of the system.

Metastable Phase Diagram of Nanocrystalline ZrO2−Sc2O3 Solid Solutions

2009 ◽  
Vol 113 (43) ◽  
pp. 18661-18666 ◽  
Author(s):  
Paula M. Abdala ◽  
Aldo F. Craievich ◽  
Marcia C. A. Fantini ◽  
Marcia L. A. Temperini ◽  
Diego G. Lamas
Keyword(s):  
Phase Diagram ◽  
Solid Solutions ◽  
Metastable Phase ◽  
Metastable Phase Diagram

scholarly journals Metastable phases and macroheterogeneous composites

2021 ◽  
Vol 29 (1) ◽  
pp. 65-68
Author(s):  
O. V. Sukhova
Keyword(s):  
Phase Diagram ◽  
Composite Materials ◽  
Abrasive Wear ◽  
Metastable Phase ◽  
Interfacial Reactions ◽  
Metastable Phases ◽  
Metastable Phase Diagram ◽  
Rapid Dissolution ◽  
Strong Adhesion ◽  
Stable And Metastable Phases

The way to control the interfacial reactions that processes during infiltration of macroheterogeneous composite materials is suggested. The idea is to combine the stable and metastable phases in the filler’s structure which dissolves at a different rate in the molten binder. To prove this approach, the structure and gas-abrasive wear of macroheterogeneous composite materials with Cu–20Ni–20Mn binder reinforced by Fe–(9.0–10.0)B–(0.01-0.2)C filler (in wt. %) cooled at 10–20 K/s or 103–104 K/s are studied. It is shown that the wear resistance of the investigated composite materials can be enhanced by accelerating interfacial reactions between the filler and the molten binder. Therefore, the composite materials produced from a rapidly cooled Fe–B–C filler show a higher resistance to gas-abrasive wear due to formation of Fe–Fe2(B,C) metastable eutectics in its structure. This eutectics crystallizes under metastable phase diagram due to the suppression of stable Fe2(B,C) phase formation and saturation of the rest of liquid by iron in the filler cooled at 103–104 K/s. As a result of rapid dissolution of the eutectics in the molten binder during infiltration, the strong adhesion at the interfaces of the composite materials is achieved which prevents the filler from spalling out under the impacts of abrasive.

Stable and Metastable Phase Diagram of the Two-Component System (CH3)3CCl−(CH3)CCl3:  An Example of Crossed Isodimorphism

2001 ◽  
Vol 105 (42) ◽  
pp. 10326-10334 ◽  
Author(s):  
Luis C. Pardo ◽  
María Barrio ◽  
Josep Ll. Tamarit ◽  
Philippe Negrier ◽  
David O. López ◽  
...  
Keyword(s):  
Phase Diagram ◽  
Metastable Phase ◽  
Metastable Phase Diagram ◽  
Two Component System ◽  
Component System ◽  
Two Component

Towards a True Fe-Ni Phase Diagram

1982 ◽  
Vol 21 ◽  
Author(s):  
P L. Rossiter ◽  
R. A Jago
Keyword(s):  
Phase Diagram ◽  
Phase Equilibrium ◽  
Phase Field ◽  
Metastable Phase ◽  
Equilibrium Diagram ◽  
Metastable Phase Diagram ◽  
Iron Meteorites ◽  
Slow Cooling ◽  
Ni Alloys ◽  
True Equilibrium

ABSTRACTA modification to the existing Fe-Ni phase equilibrium diagram is proposed that takes account of the low-temperature ordering reaction to FeNi. It is shown that true equilibrium is never attained during slow cooling of Fe-Ni alloys, even for iron meteorites (which cool extremely slowly). In all real cases, a metastable phase diagram applies, in which the depressed γ/α+γ solvus produces a more extensive γ+ FeNi phase field than for the equilibrium case. This enlarged phase field is used to explain the decomposition of supersaturated Fe-Ni to γ+ FeNi, which is observed only in iron meteorites.

Metastable phase diagram of the PbSn system

1986 ◽  
Vol 78 (2) ◽  
pp. 157-162 ◽  
Author(s):  
K. Mori ◽  
K.N. Ishihara ◽  
P.H. Shinghu
Keyword(s):  
Phase Diagram ◽  
Metastable Phase ◽  
Metastable Phase Diagram
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