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Proceedings Paper

Undercooling of Cu-based binary alloys in a flux and long drop tube
Author(s): Michael B. Robinson; Delin Li; Thomas J. Rathz
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Paper Abstract

Several Cu-based alloys such as Cu-Co, Cu-Fe and Cu-Nb, which are of considerable technological importance, possess a flattened liquidus implying a thermodynamic tendency to immiscibility upon undercooling. In this paper, both container and containerless processing were used to study the undercooling behavior, metastable liquid separation and microstructural development in the Cu-based systems. For undercooling experiments in an oxide flux, the melt separation temperature could be measured and the metastable liquid miscibility gap has been directly determined; while containerless processing in the 105 m drop tube permits larger undercooling to be achieved prior to solidification. All phase-separated samples were found to exhibit droplet- shaped morphologies, however there were various droplet size distributions, dependent upon composition, undercooling, and cooling rate.

Paper Details

Date Published: 6 July 1999
PDF: 7 pages
Proc. SPIE 3792, Materials Research in Low Gravity II, (6 July 1999); doi: 10.1117/12.351278
Show Author Affiliations
Michael B. Robinson, NASA Marshall Space Flight Ctr. (United States)
Delin Li, NASA Marshall Space Flight Ctr. (United States)
Thomas J. Rathz, Univ. of Alabama in Huntsville (United States)

Published in SPIE Proceedings Vol. 3792:
Materials Research in Low Gravity II
Narayanan Ramachandran, Editor(s)

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