Effects of variable Au/Cu ratio and Ga content on the ordering rate in Au-Cu and Au-Cu-Ga alloys

Riichi Ouchida, S. Matsuya, T. Shiraishi, Masaharu Nakagawa, M. Ohta, Y. Terada

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

The ordering rate in Au-Cu binary alloys can be modified by gallium addition. In order to investigate the effect of the Au/Cu ratio and gallium content on the ordering rate, the free energy change associated with the order-disorder transformation was estimated. A Rietveld analysis of the X-ray diffraction patterns of the AuCuI ordered phase was made to investigate the site preference of the gallium atoms in the AuCuI ordered structure. Our main results are as follows. In the Au-Cu binary and Au-Cu-Ga ternary alloys, the age-hardening rate strongly decreased for large deviations of the Au/Cu or Au/(Cu+Ga) ratio from 1. It was caused by a decrease in the driving force for atomic ordering. Gallium addition caused an increase in the driving force for ordering and a decrease of the liquidus temperature, which resulted in the acceleration of age-hardening rate. Gallium atoms occupied the Cu site rather than the Au site in the Au-Cu-Ga ordered phase.

Original languageEnglish
Pages (from-to)281-286
Number of pages6
JournalJournal of Alloys and Compounds
Volume292
Issue number1-2
DOIs
Publication statusPublished - Nov 15 1999

Fingerprint

Gallium
Age hardening
Rietveld analysis
Atoms
Ternary alloys
Order disorder transitions
Binary alloys
Diffraction patterns
Free energy
X ray diffraction
Temperature

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

Cite this

Effects of variable Au/Cu ratio and Ga content on the ordering rate in Au-Cu and Au-Cu-Ga alloys. / Ouchida, Riichi; Matsuya, S.; Shiraishi, T.; Nakagawa, Masaharu; Ohta, M.; Terada, Y.

In: Journal of Alloys and Compounds, Vol. 292, No. 1-2, 15.11.1999, p. 281-286.

Research output: Contribution to journalArticle

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AU - Nakagawa, Masaharu

AU - Ohta, M.

AU - Terada, Y.

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N2 - The ordering rate in Au-Cu binary alloys can be modified by gallium addition. In order to investigate the effect of the Au/Cu ratio and gallium content on the ordering rate, the free energy change associated with the order-disorder transformation was estimated. A Rietveld analysis of the X-ray diffraction patterns of the AuCuI ordered phase was made to investigate the site preference of the gallium atoms in the AuCuI ordered structure. Our main results are as follows. In the Au-Cu binary and Au-Cu-Ga ternary alloys, the age-hardening rate strongly decreased for large deviations of the Au/Cu or Au/(Cu+Ga) ratio from 1. It was caused by a decrease in the driving force for atomic ordering. Gallium addition caused an increase in the driving force for ordering and a decrease of the liquidus temperature, which resulted in the acceleration of age-hardening rate. Gallium atoms occupied the Cu site rather than the Au site in the Au-Cu-Ga ordered phase.

AB - The ordering rate in Au-Cu binary alloys can be modified by gallium addition. In order to investigate the effect of the Au/Cu ratio and gallium content on the ordering rate, the free energy change associated with the order-disorder transformation was estimated. A Rietveld analysis of the X-ray diffraction patterns of the AuCuI ordered phase was made to investigate the site preference of the gallium atoms in the AuCuI ordered structure. Our main results are as follows. In the Au-Cu binary and Au-Cu-Ga ternary alloys, the age-hardening rate strongly decreased for large deviations of the Au/Cu or Au/(Cu+Ga) ratio from 1. It was caused by a decrease in the driving force for atomic ordering. Gallium addition caused an increase in the driving force for ordering and a decrease of the liquidus temperature, which resulted in the acceleration of age-hardening rate. Gallium atoms occupied the Cu site rather than the Au site in the Au-Cu-Ga ordered phase.

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