Glass forming ability and in-situ composite formation in Pd-based bulk metallic glasses

• Published in: Acta materialia 2003-01, Vol.51 (2), p.561-572
• Main Authors: Hu, X., Ng, S.C., Feng, Y.P., Li, Y.
• Format: Article
• Language: English
• Subjects: Applied sciences; Bulk metallic glass (BMG); Composite; Condensed matter: structure, mechanical and thermal properties; Crystallization; Equations of state, phase equilibria, and phase transitions; Exact sciences and technology; Glass transitions; Metals. Metallurgy; Microstructure; Physics; Specific phase transitions
• ISSN: 1359-6454; 1873-2453
• DOI: 10.1016/S1359-6454(02)00438-X

Pd 60− x Ni 10Cu 30P x alloys with x=10–20 were prepared by chill-casting, Bridgman solidification and melt spinning, giving a cooling rate range from 0.63 to ∼10 6 K/s. The effects of P content on the glass forming ability and in-situ bulk metallic glass (BMG) matrix composite formation in these alloys have been studied. Glass forming ability of the Pd–Ni–Cu–P alloys improves with increasing P content. This is interpreted in terms of the reduced glass transition temperature T rg given by T g/ T L and the crystallization rate constant K T. F.c.c α-Pd crystalline phase reinforced BMG matrix composites have been synthesized in a wide range of compositions. The formation of the in-situ BMG matrix composite is explained qualitatively in terms of competition between eutectic growth and amorphous phase formation.