Supercooling effects in faceted eutectic Nb-Si alloysThe effect of melt supercooling on the microstructure of an Nb-58 at. pct Si alloy is investigated experimentally using an electromagnetic levitation apparatus. It is found that, starting with an alloy nominally of eutectic composition, nucleation of Nb5Si3 occurs in the supercooled liquid first. Upon further cooling, the remaining liquid continues to supercool until the second phase, NbSi2 is nucleated, which is commonly accompanied by rapid recalescence. The primary phase exibits a eutectoid-type decomposition. The observations are discussed with reference to the results of quantitative microstructural measurements, compositional and thermal analysis, and preliminary thermodynamic modeling of the phase diagram.
Document ID
19890032248
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Gokhale, A. B. (Florida Univ. Gainesville, FL, United States)
Sarkar, G. (Florida Univ. Gainesville, FL, United States)
Abbaschian, G. J. (Florida, University Gainesville, United States)
Haygarth, J. C. (Florida Univ. Gainesville, FL, United States)
Wojcik, C. (Teledyne Wah Chang Albany Albany, OR, United States)
Date Acquired
August 14, 2013
Publication Date
January 1, 1988
Subject Category
Metallic Materials
Meeting Information
Meeting: Solidification Processing of Eutectic Alloys