Bulk metallic glass formation in the Pd-Ni-P and Pd-Cu-P alloy systems

摘要

Since the first successful synthesis of glassy Au-Si and Pd-Si by P. Duwez and co-workers (1), the production of amorphous alloys has been associated with the rapid solidification of melts at cooling rates on the order of 10~6 K/sec. In these and many other alloys, high cooling rates are necessary to avoid the crystallization of the undercooled melt while it is quenched from the liquidus temperature T_1 to the glass transition temperature, T_g, The required fast cooling rate restricts at least one of the dimensions of the amorphous products to less than about 50 mum. Becase amorphous metallic alloys have many potential technologial appliations, the recent discovery that certain alloy melts can be quenched into bulk amorphous states has recieved great attention.