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Influence of thermal activation on the changes of physical properties and structure of cobalt-based metallic glass

Spilka M., Griner S., Kania A.

Archives of Materials Science and Engineering

2012

Vol. 56, nr 2

61--68

Purpose: In this paper the analysis of influence of heat treatment on the structure and properties of AMM type (Co70.5Fe2.5Mn2Mo1Si9B15) metallic glass was shown. Moreover the discussion of the changes of tensile strength, plasticity, cracking energy, remanence, coercive force, resistivity, crystallization effect and fracture morphology of alloy in “as quenched” state and hold at the temperature range of 100-400°C for 2 hours are presented. Design/methodology/approach: Tensile test and investigation of elementary cracking energy of amorphous ribbon carried out using the testing machine were performed. Plastic properties of examined material was studied by using of transverse bend test. Investigation of magnetic properties with annular method with 50 Hz field frequency was carried out. The alloy electrical resistivity was determined with resistance bridge. Fractography investigation after tensile test was made using scanning microscope. Findings: The investigations showed that for the analysed heat treatment temperature range of 100-400°C significant changes of physical properties, fracture morphology and alloy structure are observed. Research limitations/implications: Usage of metallic glasses is possible only in a narrow range of temperatures which does not lead to significant changes of properties or after proper heat treatment carried out in the aim of specified physical properties obtaining. Practical implications: Usage of metallic glasses depending on control and regulations of alloy properties changes with proper heat treatment. It is important the prediction of alloy properties changes during temperature changes and material using. Originality/value: In the article influence of thermal activation processes on structure changes and significant changes of mechanical and magnetic properties of cobalt-based metallic glass were presented.