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Calculation of the Unstable Mixing Region in Zn_{1-x}Cd_xO Ternary Alloys

100%
Shtepliuk I.
Acta Physica Polonica A
|
2013
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vol. 124
|
issue 5
865-868
EN
The Zn_{1-x}Cd_xO ternary alloys with a narrow band gap, which are useful for light emitters in the visible wavelengths, are studied with respect to the unsteady region in mixing. This unstable region in mixing is calculated from the free energy of mixing using the strictly regular solution model. The interaction parameter used in this calculation is obtained by means of the valence-force-field model. An influence of the strain energy induced by substrate on the region of the spinodal decomposition for the Zn_{1-x}Cd_xO system is studied and discussed.
2
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Requirement for and Use of Coated P92 Steel for Enhanced Structural Integrity at High Temperature

88%
Hoey T., Chen R., McCartney D., Sun W., Mansfield J., Barnard P., Foster J.
Acta Physica Polonica A
|
2015
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vol. 128
|
issue 4
514-519
EN
To achieve climate change targets and to improve the efficiency of fossil fuel power plant the temperature and pressure of operation must be increased. With steam temperatures predicted to rise by 50-100 K in the next 30 years, this presents a number of material challenges, not least for the ferritic steels used for steam pipework. Currently the best in class ferritic steel for power plant steam pipework is P92, a 9-12% Cr advanced martensitic steel that was developed for its superior high temperature creep resistance. This paper will give a brief overview of P92 microstructure, composition and metallurgy and identify experimentally and computationally some key features of the material. As well as failure by creep, P92 at high temperature also suffers from steam oxidation damage. Recent literature suggests that coatings applied to P92 are a very promising solution. A short review of previous work on steam oxidation resistant coatings for P92 is included. A novel Co-Cr-C coating that has not previously been explored for this application is described. Experimental and computational characterisation is included.
3
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The Effect of Phase Decomposition on Magnetic Structure of Cu_{0.4}Mn_{0.3}Ni_{0.3} Alloy

75%
Świderska K., Jankowska-Kisielińska J.
Acta Physica Polonica A
|
2015
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vol. 127
|
issue 2
394-396
EN
The purpose of present investigation was to study the effects of phase decomposition of the Cu_{0.4}Mn_{0.3}Ni_{0.3} alloy on its magnetic ordering. The single-crystal sample was examined by elastic neutron scattering before and after five subsequent annealing runs. The results indicate that in small fraction of the quenched sample volume there are two types of antiferromagnetic order: one of them AF1 of the long range, the other one of the short range. Ageing induces phase decomposition which yields disappearance of AF1 long range order and increase of the volume of new ordered phase. The results of the investigations of the aged sample indicate that regions of new tetragonal phase exhibit antiferromagnetic ordering with magnetic moments of Mn atoms arranged as in the pure compound MnNi but with unequal domain distribution. The intensity of magnetic component of super-structure reflections increases with the duration of ageing at lower rate than component due to atomic order.
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