Formation of Fe86Zr5.5Nb5.5B3 Nanocrystalline Bulk Alloy under High Pressure
Mechanical alloying(MA) technique and single-roller melt spinning technique were used to prepare Fe86Zr5.5Nb5.5B3 nanocrystalline and amorphous powders, bulk alloys were prepared by cryogenically high-pressure quick sintering. The results showed that: (1) after MA process for 15 hours, the grain size of α-Fe phase was ≤10nm; (2) melt spinning powders were fragmented by ball milling, but remained amorphous state. The crystallization temperature of this amorphous powder was about 500°C. Apparent activation energy of the amorphous crystallization was E=294.1KJ/mol; (3) under the quick sintering conditions of P=5.5GPa/t=3min/Pw≥1050W, single phaseα-Fe nanocrystalline(8～15nm) bulk alloys with relative density≥98.7% can be obtained.
Z.Y. Zhong, H. Saka, T.H. Kim, E.A. Holm, Y.F. Han and X.S. Xie
B. Lu et al., "Formation of Fe86Zr5.5Nb5.5B3 Nanocrystalline Bulk Alloy under High Pressure", Materials Science Forum, Vols. 475-479, pp. 3467-3470, 2005