Crystallization of amorphous Ni35Zr65 and Fe40Ni40P14B6 under proton irradiation

摘要: Abstract Two amorphous alloys, Ni 35 Zr 65 and Fe 40 P 14 B 6 , were irradiated using 400 keV protons at several temperatures below the crystallization temperature, T x to peak doses in neighborhood of 3.5 4.5 dpa. Irradiation 250°C resulted both which examined by transmission electron microscopy samples electrolytically polished various distances from surface study effect dose. Samples masked proton beam remained during irradiation. In alloy equilibrium phases propagated throughout entire sample, while was observed only those parts lying within range. Neither crystallized irradiation 100°C. these alloys phase is therefore evidently stable approximately 0.6 . An examination literature on damage binary intermetallic compounds suggests that there a tendency for initially remain temperatures, irr L where (≈ ) “melting” temperature (either eutectic, peritectic or congruent melting temperature). Also, same even when they are crystalline, transform state Some other crystalline have also been shown though never prepared this condition rapid quenching techniques. The 0.3 appears be lower limit, however, since transformation occurs many greater than It suggested, analogy with results void formation metals, low limit related mobility vacancies materials, although mechanism crystallization, conversely amorphization, not fully understood.