Growth of modulated structure in gold-platinum alloys

R. W. Carpenter

doi:10.1016/0001-6160(67)90129-0

Growth of modulated structure in gold-platinum alloys

R. W. Carpenter

Research output: Contribution to journal › Article › peer-review

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Abstract

The growth of structural modulations during the early stages of precipitation in gold-platinum alloys has been investigated using the Debye-Scherrer X-ray diffraction method. Three alloys having the compositions 40% Pt-60% Au, 60% Pt-40% Au, and 80% Pt-20% Au were examined over the aging temperature range 500°-600°C. The modulation wavelength was found to be nearly constant for short aging times and then to increase uniformly to a maximum value upon further aging. The maximum wavelength attained by the alloy of critical composition is smaller than the maximum observed for the 40-60 or 80-20 alloys: this was attributed to a maximum in elastic strain energy, due to coherency strains, at the critical composition. The change in wavelength growth rate with aging time is in qualitative agreement with the theory of spinodal decomposition.

Original language	English (US)
Pages (from-to)	1567-1572
Number of pages	6
Journal	Acta Metallurgica
Volume	15
Issue number	10
DOIs	https://doi.org/10.1016/0001-6160(67)90129-0
State	Published - Oct 1967
Externally published	Yes

ASJC Scopus subject areas

Engineering(all)

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10.1016/0001-6160(67)90129-0

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title = "Growth of modulated structure in gold-platinum alloys",

abstract = "The growth of structural modulations during the early stages of precipitation in gold-platinum alloys has been investigated using the Debye-Scherrer X-ray diffraction method. Three alloys having the compositions 40% Pt-60% Au, 60% Pt-40% Au, and 80% Pt-20% Au were examined over the aging temperature range 500°-600°C. The modulation wavelength was found to be nearly constant for short aging times and then to increase uniformly to a maximum value upon further aging. The maximum wavelength attained by the alloy of critical composition is smaller than the maximum observed for the 40-60 or 80-20 alloys: this was attributed to a maximum in elastic strain energy, due to coherency strains, at the critical composition. The change in wavelength growth rate with aging time is in qualitative agreement with the theory of spinodal decomposition.",

author = "Carpenter, {R. W.}",

note = "Funding Information: This work is supported by the U.S. Atomic Energy Commission. The author expresses his thanks to Professor E. R. Parker for ,tidance during this investigation and to Dr. C. J. Sparks for a helpful discussion of the.results.",

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AU - Carpenter, R. W.

N1 - Funding Information: This work is supported by the U.S. Atomic Energy Commission. The author expresses his thanks to Professor E. R. Parker for ,tidance during this investigation and to Dr. C. J. Sparks for a helpful discussion of the.results.

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N2 - The growth of structural modulations during the early stages of precipitation in gold-platinum alloys has been investigated using the Debye-Scherrer X-ray diffraction method. Three alloys having the compositions 40% Pt-60% Au, 60% Pt-40% Au, and 80% Pt-20% Au were examined over the aging temperature range 500°-600°C. The modulation wavelength was found to be nearly constant for short aging times and then to increase uniformly to a maximum value upon further aging. The maximum wavelength attained by the alloy of critical composition is smaller than the maximum observed for the 40-60 or 80-20 alloys: this was attributed to a maximum in elastic strain energy, due to coherency strains, at the critical composition. The change in wavelength growth rate with aging time is in qualitative agreement with the theory of spinodal decomposition.

AB - The growth of structural modulations during the early stages of precipitation in gold-platinum alloys has been investigated using the Debye-Scherrer X-ray diffraction method. Three alloys having the compositions 40% Pt-60% Au, 60% Pt-40% Au, and 80% Pt-20% Au were examined over the aging temperature range 500°-600°C. The modulation wavelength was found to be nearly constant for short aging times and then to increase uniformly to a maximum value upon further aging. The maximum wavelength attained by the alloy of critical composition is smaller than the maximum observed for the 40-60 or 80-20 alloys: this was attributed to a maximum in elastic strain energy, due to coherency strains, at the critical composition. The change in wavelength growth rate with aging time is in qualitative agreement with the theory of spinodal decomposition.

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Growth of modulated structure in gold-platinum alloys

Abstract

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