Dr. Delin Li Profile

Dr. Delin Li

Packaging Engineer

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Proceedings Article | 6 July 1999 Paper

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

Michael Robinson, Delin Li, Thomas Rathz

Proceedings Volume 3792, (1999) https://doi.org/10.1117/12.351278

KEYWORDS: Supercooling, Liquids, Niobium, Solids, Positron emission tomography, Temperature metrology, Iron, Dendrites, Copper, Cobalt

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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.

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