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Abstract
Des rubans de verrea métalliques de composition générale (FeCr)-80 (PCSi)-20 deviennent fragiles bien au-dessous de la température de cristallisation. Des essais de pliages corrélés avec des observations par spectrométrie Mössbauer et des mesures de temps de vie des positons montrent que cette fragilité est due à ľapparition ďune double couche précristalline ou microcristalline sur les faces du ruban. Les fragilités accidentelles initiales auraient la měme origine.
Is It Possible To Avoid Termal Embrittlement in Ribbon-Shaped Glassy Metals?
Is it possible to avoid thermal embrittlement in ribbon-shaped glassy metals?
A variety of ribbon-shaped metallic glasses of general composition (FeCr)-80(PCSi)-20 become brittle far below their crystallization temperature. Bending tests in conjunction with Mössbauer spectroscopy data and positron-lifetime measurements show that embrittlement could be due to the onset of precrystalline or microcrystalline layers on each side of the ribbon. Incidental initial brittleness would have a similar origin.
