Undercooling of Cu-based binary alloys in a flux and long drop tube

Michael B. Robinson; Delin Li; Thomas J. Rathz

doi:10.1117/12.351278

6 July 1999 Undercooling of Cu-based binary alloys in a flux and long drop tube

Michael B. Robinson, Delin Li, Thomas J. Rathz

Proceedings Volume 3792, Materials Research in Low Gravity II; (1999) https://doi.org/10.1117/12.351278
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1999, Denver, CO, United States

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.

Citation Download Citation

Michael B. Robinson, Delin Li, and Thomas J. Rathz "Undercooling of Cu-based binary alloys in a flux and long drop tube", Proc. SPIE 3792, Materials Research in Low Gravity II, (6 July 1999); https://doi.org/10.1117/12.351278

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