Age-hardening and related phase transformation in an experimental Ag-Cu-Pd-Au alloy

Hyo Joung Seol, Doung Hun Lee, Hee Kyung Lee, Yukyo Takada, Osamu Okuno, Yong Hoon Kwon, Hyung Il Kim

研究成果: Article査読

16 被引用数 (Scopus)

抄録

The age-hardening behaviour, phase transformation and related microstructural changes of an experimental Ag-Cu-Pd-Au alloy were examined by means of hardness test, X-ray diffraction (XRD), scanning electron microscopic (SEM) observations and electron probe microanalysis (EPMA). The specimen alloy showed apparent age-hardenability at the aging temperatures of 350 °C and 400 °C. By aging the solution-treated specimen at 400 °C, two phases of the Ag-rich α1 phase and the Pd-containing Cu-rich α2 phase were transformed into four phases of the Ag-rich α1′ phase, the Cu-rich α2′ phase, the CsCl-type CuPd phase and the AuCu(I) ordered phase. Microstructure of the solution-treated specimen consisted of the Ag-rich α1 matrix, Cu-rich α2 particle-like structures of various sizes and the lamellar structure of the α1 and α2 phases. When the peak hardness was obtained, the very fine lamellar structure consisting of the Ag-rich α1′ and Cu-rich α2′ phases was newly formed in the matrix. By further aging, the very fine lamellar structure grew and coarsened apparently, and the matrix was covered with the coarsened lamellar structure. The hardness increase was considered to be caused mainly by the diffusion and precipitation of Cu from the Ag-rich α1 matrix, and the hardness decrease in the latter stage of age-hardening process was caused by the coarsening of the very fine lamellar structure. The CsCl-type CuPd phase and the AuCu(I) ordered phase did not contribute to the hardness increase.

本文言語English
ページ(範囲)182-187
ページ数6
ジャーナルJournal of Alloys and Compounds
407
1-2
DOI
出版ステータスPublished - 2006 1 5

ASJC Scopus subject areas

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

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