Synthesis and properties of bulk metalic glasses in pd-Ni-P and Pd-Cu-P alloys

摘要

Bulk amorphous Pd-Ni-P and Pd-Cu-P alloy rods with diameters ranging from 7 to 25 mm have been synthesized over a wide composition range using a fluxing technique. For most bulk amorphous Pd-Ni-P alloys, the difference DELTA T= T-x-T_g between the crystallization temperature T_x and the glass transition temperature T_g is larger than 90 K, while for bulk amorphous Pd-Cu-P alloys, DELTA T varies from 27 to 73 K. Pd_40Ni_40P_20 has the highest glass formability, and 300-gram bulk amorphous cylinders, 25 mm in diameter and 50 mm in lenght, can be easily produced. THis size, however, is not an upper limit. The paper presents the glass formation ranges for both ternary alloy systems and data on the thermal stability of the amorphous alloys, as well as their specific heat, density, and elastic properties.