The Role of Density Gradient Energy in Alloy Phase Segregation

• Tsujimoto Tokuzou

  National Research Institute for Metals

抄録

Diffusion behavior of composition variation peaks in supersaturated solid solutions has been discussed using Fourier transform of Cahn-Hilliard’s diffusion equation. For the cases where the peak of positive compositional deviation at the location x=0 is a maximum of composition variation, it is shown that the condition for a rise of the peak is given by ψ−\ ildeD_x=0>0. Here, \ ildeD_x=0 is the interdiffusion coefficient of the peak composition and ψ=−2Kβ²[∑_h=−∞^∞h⁴Q(h)⁄∑_h=−∞^∞h²Q(h)]. hβ and Q(h) are the wavenumber of a Fourier wave and its component, respectively, and K is (gradient energy coefficient)×(mobility of atoms). In high solute alloys, the peak rises even in the range where −\ ildeD_x=0<0 by formation of the Fourier spectra for which ψ>0, and ψ becomes equal to \ ildeD_x=0 when the composition peak reaches the equilibrium composition. In very low solute alloys the peak sinks even in the range where −\ ildeD_x=0>0 by generation of the spectra for which ψ<0.

収録刊行物

• Transactions of the Japan Institute of Metals

  Transactions of the Japan Institute of Metals 22 (4), 217-224, 1981

  社団法人 日本金属学会

キーワード

• General Engineering

詳細情報

• CRID: 1390282680094560512
• NII論文ID: 130003485895
• DOI: 10.2320/matertrans1960.22.217
• ISSN: 24324701
• ISSN: 00214434
• Web Site: https://www.jstage.jst.go.jp/article/matertrans1960/22/4/22_4_217/_pdf
• 本文言語コード: en
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