Transformation Behavior of Pd-Au-Si Metallic Glasses.
Abstract
The transformation behavior of roller-quenched amorphous Pd(0.82-x)Au(x)Si(0.18) and Pd(0.835-x)Au(x)Si(0.165) alloys, where x = or < 0.10, after rapid heating to temperatures near to or above T sub g, is reported. Binary Pd(0.18)Si(0.18) alloys crystallized to an f.c.c. phase without apparent composition segregation. The tendency to phase separate at T near T sug g, as manifested by small (SAXS) and large angle x-ray scattering and calorimetry, increased with increasing Au substitution. PD(0.8)Au().035)Si(0.165) alloy apparently phase separated by a nucleation and growth mechanism, with a growth rate limited by the melt viscosity, to form an f.c.c. phase dispersed in an amorphous phase which later crystallized. Pd(0.74)Au(0.8)Si(0.18 alloy phase spearated initially to two melts each of which later crystallized in turn. The initial separation behavior was generally consistent with the predictions of the spinodal theory but with some deviation from Cahn's linear relation.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1975
- Accession Number
- ADA010857
Entities
People
- C. -p. Peter Chou
- David Turnbull
Organizations
- Harvard University