Composition and non-equilibrium crystallization in partially devitrified co-rich soft magnetic nanocomposite alloys
作者： P.R. Ohodnicki , Y.L. Qin , D.E. Laughlin , M.E. McHenry , M. Kodzuka
DOI: 10.1016/J.ACTAMAT.2008.08.051
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摘要: Abstract The body-centered cubic (bcc) phase tends to preferentially nucleate during solidification of highly undercooled liquid droplets binary alloy systems, including Fe–Co, Fe–Ni and Fe–Cr–Ni. We investigate a similar tendency the partial devitrification Co-rich amorphous precursors composition (Co1−xFex)88Zr7B4Cu1 by identifying structure nanocrystalline grains. Co:Fe ratio bcc nanocrystals varies linearly with precursor, can lie well within single-phase face-centered (fcc) region Fe–Co diagram at crystallization temperature. Classical nucleation theory therefore suggests several potential explanations for preferential from an including: (i) reduced amorphous/bcc interface energy as compared close-packed phases; (ii) lower strain precipitation nuclei fcc hexagonal nuclei; (iii) stabilization dissolved glass-formers such Zr B.
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