ALUMINIUM LOOS IN THE PROCESS OF Ti-6Al-7Nb SMELTING

Autor: Grzegorz Siwiec, Leszek Blacha, B. Oleksiak, Piotr Folęga
Rok vydání: 2013
Předmět:
Zdroj: Acta Metallurgica Slovaca, Vol 19, Iss 4 (2013)
ISSN: 1338-1156
1335-1532
1973-2023
DOI: 10.12776/ams.v19i4.174
Popis: In the paper, results of experimental smelting of the Ti-6Al-7Nb alloy in a vacuum induction furnace are presented. The experiments were performed at 5-1000 Pa and 1973-2023 K. For the analysed alloy, a significant impact of pressure on aluminium loss was observed. Pressure reduction in the device from 1000 Pa to 5 Pa was accompanied by Aluminium content decrease from the initial value of 5.5 % mass to a value even below 3.2 % mass. Moreover, aluminium elimination was enhanced when the smelting temperature increased. Additionally, values of a so-called evaporation coefficient (Ω) were determined. In terms of titanium and niobium, ΩAl/Ti and ΩAl/Nb values suggest that, thermodynamically, aluminium loss may result from its intense evaporation from the investigated alloy.
Databáze: OpenAIRE