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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.42  No.8 (2001)  >  pp.1523-1529

MATERIALS TRANSACTIONS
<<Previous article Vol.42  No.8 (2001)   pp.1523 - 1529 Next article>>

Short-Range Order and Micromechanisms Controlling Nanocrystallization of Iron-Cobalt Based Metallic Glasses

Katarina Krištiaková1), Peter Švec1) and Dušan Jani\v{c}kovi\v{c}1)
1) Institute of Physics, Slovak Academy of Sciences

Transition from amorphous to nanocrystalline state has been investigated from the viewpoint of rate theory in Fe–Co–Zr–B metallic glass by evaluation of changes of electrical resistivity using a novel method of continuous distribution analysis and by transmission electron microscopy and X-ray diffraction. Ordering process inside α-FeCo nanograins has been observed. The mechanism controlling nanocrystallization is the same throughout the entire reaction. Before the nanocrystallization is over, a new microprocess becomes active. The units active in initial and final stages of transformation may differ in local chemical ordering. The results allow to infer on the character of the original amorphous structure for which we propose two types of internally correlated and chemically ordered regions with different Zr content.


Keyword:
nanocrystallization, nanocrystalline alloys, iron-cobalt-zirconium-boron amorphous alloy, Hitperm, transmission electron microscopy, X-ray diffraction, electrical resistivity, grain-size distribution, transformation rates, activation energy distributions.

Received: February 28, 2001
Accepted: June 01, 2001 , Published online: September 06, 2005
Copyright (c) 2005 The Japan Institute of Metals

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