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Evolution of Magnetic and Mechanical Properties in FINEMET-Type Precursor Glasses during Isothermal and Pulse Heat Treatments

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Hubač L., Novák L., Balla S., Lovas A.
Acta Physica Polonica A
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2017
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vol. 131
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issue 4
672-674
EN
The effects on the evolution of coercivity (H_c) and brittleness in FINEMET-type precursor glasses during traditional (isothermal) and pulse heat treatments are compared. The time and temperature dependences of these quantities are monitored during the series of isothermal and pulse heat treatments. The activation energy for H_c relaxation is lower than that for the brittleness evolution, however, dramatic changes in the values of these quantities can be detected above 300°C. Both quantities change mainly with temperature, they are less time-dependent.
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On the Mechanism of H-Induced Curie-Point Relaxation in Fe-Based Glassy Alloys

100%
Balla S., Kováč J., Novák L., Lovas A.
Acta Physica Polonica A
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2008
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vol. 113
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issue 1
55-59
EN
In Fe based glasses not solely the stress-sensitive magnetic properties, but also the amorphous Curie temperature (T_C^{am}) can be altered by hydrogen absorption or due to the low temperature "heat treatments" in liquid N_2 (-196°C). The sign and magnitude of this T_C^{am} shift is strongly compositional dependent, but it is also influenced by the thermal history of glasses (heat treatments). In this paper new experimental results are presented, which were obtained on FeCrB alloys, supporting the previous observations. An attempt of interpretation of the results is also made, which is based on the existence of the quenched-in phase reminiscences, being inherited from the liquid structure.
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