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Author Naohara, T.
Sponsorship USDOE
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword MATERIALS SCIENCE ♦ IRON BASE ALLOYS ♦ CRYSTALLIZATION ♦ SILICON ALLOYS ♦ BORON ALLOYS ♦ NIOBIUM ALLOYS ♦ ZIRCONIUM ALLOYS ♦ VANADIUM ALLOYS ♦ COPPER ALLOYS ♦ SAMPLE PREPARATION ♦ MELTING ♦ CHEMICAL COMPOSITION ♦ CALORIMETRY ♦ TRANSMISSION ELECTRON MICROSCOPY ♦ TEMPERATURE DEPENDENCE ♦ AGING ♦ GRAIN SIZE ♦ DENDRITES
Abstract The crystallization behavior of amorphous Fe{sub 84{minus}X}Si{sub 6}B{sub 10}M{sub X} (M = Nb, Zr, V, or Cu) alloys was examined using differential scanning calorimetry (DSC) and transmission electron microscopy (TEM) with the aim of clarifying the effect of additional M elements. The compositional dependence of the first crystallization temperature T{sub x1} increased in the order of Zr > Nb > V; however, the addition of 1 at. pct Cu caused a decrease in T{sub x1}. Such an effect of the M elements on the thermal stability of an amorphous phase was interpreted in terms of the difference in the atomic size. These alloys were composed of a mixed structure of {alpha}-Fe phase. However, their particles possessed dendritic morphology with a grain size of 0.1 to 0.3 {micro}m, when the Nb or Zr content was less than 2 at. pct. Further addition of these elements brought about the formation of spherical {alpha}-Fe particles. The average grain size, for instance, was as small as 20 nm in the aged alloy containing 6 at. pct Nb, which shows that a remarkable grain refinement occurs with increasing Nb content.
ISSN 10735623
Educational Use Research
Learning Resource Type Article
Publisher Date 1996-11-01
Publisher Place United States
Journal Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science
Volume Number 27
Issue Number 11


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