Competitive formation of ternary metallic glasses

In an effort to elucidate the formation of metallic glasses and glass-matrix composites in ternary eutectic systems, we have applied the competitive growth principle with the premise that glass formation competes with the growth of all the possible crystalline structures. It is found that each cryst...

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Bibliographic Details
Published in:Acta materialia 2006-04, Vol.54 (7), p.1927-1934
Main Authors: Ma, D., Chang, Y.A.
Format: Article
Language:English
Subjects:
Amorphous materials
Applied sciences
Competitive growth
Composite
Crystal structure
Dendrite
Dendritic structure
Eutectic
Eutectic composition
Eutectics
Exact sciences and technology
Glass formation
Metallic glass
Metallic glasses
Metals. Metallurgy
Optimization
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Summary:In an effort to elucidate the formation of metallic glasses and glass-matrix composites in ternary eutectic systems, we have applied the competitive growth principle with the premise that glass formation competes with the growth of all the possible crystalline structures. It is found that each crystalline structure defines a characteristic glass-forming velocity beyond which its growth will be completely suppressed by glass formation. A glass-forming composition diagram, as thus derived, indicates that the formation of a full glass is limited by the complete suppression of growth of the primary competing structure that has the greatest characteristic glass-forming velocity. Moreover, the formation of two types of glass-matrix composites, i.e., single-phase dendrites plus a glass, and single-phase dendrites plus a two-phase eutectic plus a glass, has been predicted as a result of the incomplete suppression of growth of the primary and/or secondary competing structures. A new criterion gauging the globally optimum glass-forming ability in a ternary eutectic system is also derived.
ISSN:1359-6454
1873-2453
DOI:10.1016/j.actamat.2005.12.015