Precipitation of chromium borides in annealed nickel aluminides

Autor:	G. Carro, W. F. Flanagan, J. E. Wittig, E.A. Kenik
Rok vydání:	1990
Předmět:	inorganic chemicals Chromium Nickel Materials science chemistry Precipitation (chemistry) Metallurgy technology industry and agriculture chemistry.chemical_element General Medicine equipment and supplies
Zdroj:	Proceedings, annual meeting, Electron Microscopy Society of America. 48:948-949
ISSN:	2690-1315 0424-8201
DOI:	10.1017/s0424820100177878
Popis:	Alloys based on the intermetallic phase, Ni3Al, are a class of materials noted for superior elevated temperature mechanical properties and oxidation resistance. Boron has been shown to increase ductility in these alloys and chromium additions to boron-doped nickel aluminide alloys have been reported to improve the high temperature properties by reducing dynamic embrittlement in oxidizing environments. However, a potential problem with these Ni-Al-Cr-B alloys is the depletion of chromium and boron at grain boundaries from chromium boride precipitation.Two alloys were investigated for elevated temperature chromium boride precipitation. The first, IC-218, has the composition (at%): 16.4 Al, 8.0 Cr, 0.4 Zr, 0.1 B, Ni bal., and the second, OR3B contains 15.0 Al, 10.0 Cr, 0.1 B, Ni bal.. Samples of both alloys were rapidly solidified into circular foils, 0.25 mm thick, by splat quenching between two copper plates. Also, cold rolled and recrystallized sheet, 3 mm thick, of IC-218 was used for comparison.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::a0071f523aeeba473d32b2007c8fe8e7 https://doi.org/10.1017/s0424820100177878 Zobrazit plný text záznamu