Positron Annihilation Study of Structural Relaxation and Crystallisation in Cobalt Based Metallic Glass

Ravindrachary, V.; Sreepad, H. R.; Chandrashekara, A.; Ranganathaiah, C.; Gopal, S.

doi:10.4028/www.scientific.net/msf.105-110.1201

Cited by 2 publications

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“…The increase in the positron lifetime connected with crystallization is caused by positron trapping in vacancies and grain boundaries not present in the glassy alloy. Such increase was observed for cobalt-based metallic glass Co-Si-B-Mn-Fe-Mo [13]. In some cases the presence of a second component in the lifetime spectra may be the evidence of such positron traps appearance, e. g. conventional Fe-Si-Be metallic glass [2].…”

Section: Resultsmentioning

confidence: 73%

Positron Annihilation in Thermally Treated Co-Zr-V Metallic Glasses

Dryzek

Jaworski

Fleury

et al. 2010

MSF

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Positron annihilation lifetime spectroscopy (PALS) has been applied to study if the microstructure changes in Co80Zr10V10 and Co65Zr10V25 metallic glasses after heat treatment. Samples in as-quenched state were isothermally annealed at chosen temperatures in the temperature range 100°C - 580°C for 1 hour. In spite of differences of chemical composition and magnetic properties the obtained dependencies of positron lifetime on annealing temperature do not differ significantly for lower temperatures. The higher increase of positron lifetime for Co65Zr10V25 than that for Co80Zr10V10 indicates differences in crystallization in the two metallic glasses studied.

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