In situ observation of spinodal decomposition in In-35 at.% Tl-13.5 at.% Pb alloys

Research output: Contribution to journalArticle

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Abstract

In situ observation of a spinodal decomposition in an In-35 at.% Tl-13.5% Pb alloys was made by transmission electron microscopy. When the alloy is aged at room temperature, the spinodal decomposition from fcc to f.c.t.(c/a > 1) + f.c.t. (c/a < 1) takes place, followed by the f.c.t.(c/a > 1) + f.c.t.(c/a < 1) → f.c.c.* + f.c.t.*(c/a > 1) separation. The in situ observation clearly confirmed that in the spinodal decomposition the formation of interfaces due to the growth of a compositional fluctuation takes place in an early stage and their disappearance in a later stage. Two types of elementary processes for the disappearance of the interfaces occur in the later stage. Further, both the power law for the increase in the wavelength, λ ∝ t 1 3, and the dynamic scaling law for the space correlation function are found in the later stage on the analysis of the in situ observation. On the basis of the experimental results, the one-dimensional collision model is proposed for the later stage and further the frequency of the collision between a kink and an antikink, ω′, is shown to obey a power law of ω′ ∝ t-1.

Original languageEnglish
Pages (from-to)857-866
Number of pages10
JournalActa Metallurgica et Materialia
Volume38
Issue number5
DOIs
Publication statusPublished - 1990
Externally publishedYes

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Spinodal decomposition
Scaling laws
Transmission electron microscopy
Wavelength
Temperature

ASJC Scopus subject areas

  • Engineering(all)

Cite this

In situ observation of spinodal decomposition in In-35 at.% Tl-13.5 at.% Pb alloys. / Koyama, Yasumasa.

In: Acta Metallurgica et Materialia, Vol. 38, No. 5, 1990, p. 857-866.

Research output: Contribution to journalArticle

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abstract = "In situ observation of a spinodal decomposition in an In-35 at.{\%} Tl-13.5{\%} Pb alloys was made by transmission electron microscopy. When the alloy is aged at room temperature, the spinodal decomposition from fcc to f.c.t.(c/a > 1) + f.c.t. (c/a < 1) takes place, followed by the f.c.t.(c/a > 1) + f.c.t.(c/a < 1) → f.c.c.* + f.c.t.*(c/a > 1) separation. The in situ observation clearly confirmed that in the spinodal decomposition the formation of interfaces due to the growth of a compositional fluctuation takes place in an early stage and their disappearance in a later stage. Two types of elementary processes for the disappearance of the interfaces occur in the later stage. Further, both the power law for the increase in the wavelength, λ ∝ t 1 3, and the dynamic scaling law for the space correlation function are found in the later stage on the analysis of the in situ observation. On the basis of the experimental results, the one-dimensional collision model is proposed for the later stage and further the frequency of the collision between a kink and an antikink, ω′, is shown to obey a power law of ω′ ∝ t-1.",
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