Abstract
Under suitable defocus conditions, structures with atomic medium-range order (MRO) extending 1–2 nm in space can be observed in amorphous alloys as clear lattice images by means of high-resolution electron microscopy (HREM). Using the PdSi system, it was demonstrated that the MRO structure and morphology depend on the cooling rate and alloying composition. In PdSi alloys, the volume fraction and size of the MRO domains were found to increase as the cooling rate decreased. MRO with f.c.c.-like structure appears in a eutectic composition range, between approximately Pd 84Si 16 and Pd 80Si 20. We also performed detailed HREM observations and nano-beam analysis of the local structural change on annealing in Pd 82Si 18 alloy. It is concluded that the atomic free volume is annihilated by the atomic rearrangement for the formation and development of MRO domains.
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