Effect of Oxygen Impurity on Crystallization of an Undercooled Bulk Glass Forming Zr–Ti–Cu–Ni–Al Alloy

Autor: X. H. Lin, William L. Johnson, W. K. Rhim
Rok vydání: 1997
Předmět:
Zdroj: Materials Transactions, JIM. 38:473-477
ISSN: 2432-471X
0916-1821
DOI: 10.2320/matertrans1989.38.473
Popis: High vacuum, containerless, electrostatic levitation process has been used to study the undercooling and crystallization kinetics of a bulk glass forming Zr-Ti-Cu-Ni-Al alloy. The oxygen impurity level in the alloy has been found to play a crucial role in the crystallization kinetics of the undercooled melt. Overheating the melt above a critical threshold temperature results in enhancement subsequent undercooling. This crucial threshold temperature is found to be a function of the overall oxygen content of the alloy direct measurement of the time-temperature-transformation (TTT) diagram for crystallization of the undercooled melt made following initial overheating above the threshold temperature show a strong dependence on overall oxygen concentration. An explanation of these observations is proposed.
Databáze: OpenAIRE