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Wettability of Ceramic Substrates by Silver Based Alloys

100%
Weltsch Z., Lovas A.
Acta Physica Polonica A
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2013
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vol. 124
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issue 1
78-87
EN
The temperature dependence of wettability (wetting angle, Θp(T)) for Ag-based melts on graphite and Al_2O_3 substrates is compared. Typical alloying effects are found, as the Ag host metal is gradually replaced by various metallic elements. The essence of alloying lies in the change of the electron/atom (e/a) ratio. This ratio is also manifested in the shift of wetting angles on the same substrate. The effect is also supported by the calculations based on the rigid band model, and is also in qualitative agreement with the Hume-Rothery rules. Nevertheless, the effects are partially smeared by other (metallurgical) factors, like the interaction between the oxygen-alloying elements and by the graphite substrate-oxygen interaction. In contrast, such effects are not pronounced in the case of Al_2O_3 substrates. As a consequence, Θp(T) exhibits an opposite trend in the case of two substrates. Crossovers of the Θp(T) curves were often found. The positions of crossovers depend on the chemical character and concentration of solute atoms. Segregation and epitaxial texture formation after solidification were also observed in certain alloy drops, especially in high concentration range. This phenomenon is not yet explained in every detail.
2
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The Comparison of Hardness and Coercivity Evolution in Various Fe-B Based Glasses (Including FINEMET Precursor) during Relaxation and Crystallization

81%
Weltsch Z., Klam K., Lovas A.
Acta Physica Polonica A
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2017
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vol. 131
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issue 4
669-671
EN
Inverse relation exists between the hardness and coercivity change within the whole period of structural relaxation in the investigated Fe-B(Si) based metallic glasses. This relation is independent of B-content and composition. This inverse relation is no more valid in binary Fe-B glasses after the onset of crystallization, when both the hardness and coercivity exhibit rapid increase. In contrast, the inverse relation was in FINEMET type glasses between these properties preserved in the first step of crystallization during the whole period of nanocrystallization.
3
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Development of Crack Detection Method with 2 Dimensionally Generated 3 Dimensionally Reconstructed Images in THT Solder Joints

81%
Koncz-Horváth D., Gergely G., Weltsch Z., Gácsi Z.
Archives of Metallurgy and Materials
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2017
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vol. 62
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issue 2
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