Abstract
Elemental powders of Nb (77 at.%) andAl (23 at.%) were alloyed in a low-energy ball mill for 360–1800 ks in hopes of forming a nanocrystalline intermetallic compound, Nb3Al. It was revealed by careful deconvolution of XRD spectra into various peaks of possibly existing phases that the resultant powder is a nanocrystalline multiphase mixture consisting of Nb3Al, Nb2Al, elemental Nb and Al, with their particulate sizes of approximately 5–8 nm, even after 1800 ks milling. The volume fractions of these phases were estimated to be 28.4, 39.5, 30.3 and 1.8 vol.%, respectively. The kinetic energy provided by ball-milling was insufficient to produce a single Nb3Al phase, and even heating to 933 K for 25.2 ks failed the total conversion of a multiphase mixture.
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