Abstract
The high-speed steel carbide-type η phase claimed to exist in the Fe-Nb system at a composition Fe 2Nb 3 is an interstitial oxide, η-Fe 6Nb 6O. It is obtained by heating Fe-Nb alloy powders in sealed and evacuated vitreous silica capsules at 1000 °C. A second η phase with larger unit-cell dimensions is obtained by hydrogen treatment of Fe-Nb alloys at 1000–1200 °C; it is an interstitial nitride, η-Fe 3Nb 3N, formed because even “purified” hydrogen contains small concentrations of nitrogen. Examples of oxide formation by heat treatment of metals in vitreous silica and of nitride formation by heat treatment in hydrogen are not uncommon.
Full Text 
Sign-in/Register to access full text options
Sign-in/Register to access full text options 
Published version (
Free)
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
