Thermodynamic aspects of amorphous phase formation. [Zr alloys with Co, Cu, Ni]

Journal Article · Tue Dec 31 23:00:00 EST 1985 · J. Mat. Res.; (United States)

OSTI ID:5774913

Saunders, N; Miodownik, A P

The glass-forming ability of the three alloy systems Co-Zr, Cu-Zr, and Ni-Zr has been analyzed for three distinct production routes: (1) liquid quenching, (2) vapor deposition, and (3) solid-state reaction. Using the free energy and heats of formation curves obtained from the thermodynamic characterization of the respective alloy systems, a satisfactory rationale can be obtained for amorphous phase formation by all three routes. The analysis shows that while amorphous phase formation by quenching from the high-temperature liquid is clearly dependent on factors such as quench rate and the value T/sub G//T/sub M/, it is the low-temperature stability of the amorphous phase relative to the other crystalline structures that enables amorphous phases to be formed by both vapor deposition and solid-state reaction. The underlying free energy curves indicate the interesting possibility of a supersaturation sequence in the nucleation of an amorphous phase by solid-state reaction. The principles underlying thermodynamic characterizations are briefly discussed, and a characterization for Co-Zr is presented.

• Research Organization: Department of Materials Science and Engineering, University of Surrey, Guildford, Surrey, United Kingdom
• OSTI ID: 5774913
• Journal Information: J. Mat. Res.; (United States), Journal Name: J. Mat. Res.; (United States) Vol. 1:1; ISSN JMREE
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
ALLOYS
AMORPHOUS STATE
COBALT ALLOYS
COPPER ALLOYS
ENERGY
ENTHALPY
FORMATION HEAT
FREE ENERGY
METALLIC GLASSES
NICKEL ALLOYS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
REACTION HEAT
THERMODYNAMIC PROPERTIES
VITRIFICATION
ZIRCONIUM ALLOYS