Phase transitions in Cu-Sb systems induced by ball milling

M. Kis-Varga, D. L. Beke

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Abstract

Powders of CuxSb100-x mixtures in the composition range of X=0-90 at %, and arc melted CuSb alloys with Cu=60 and 82 at % nominal concentration were ball milled in vacuum. The phase transitions and the decrease of crystallite size during milling was studied by X-ray diffractometry. Partial amorphization and formation of nanocrystalline ηCu2Sb phase was observed in powder mixtures for 50 and 75 at % antimony. There was no alloying of the two components at X≤10 at %, the XRD patterns showed the structures of nanocrystalline Sb and Cu only. By increasing the copper content up to X=87 at %, the formation of nanocrystalline ηCu2Sb was observed in accordance with the equilibrium phase diagram. For X ≥ 87 at % extended Cu-base solid solutions were obtained with average grain size of 10 nm. The XRD measurements of arc melted alloys indicated an initial mixture of phases ηCu2Sb and δCu4.5Sb for Cu82Sb18 as well as a mixture of ηCu2Sb and Sb for Cu60Sb40, respectively. The milling resulted only in a nanocrystalline structure of the heterogenous alloy in both cases, and amorphization was not observed.

Original languageEnglish
Pages (from-to)465-470
Number of pages6
JournalMaterials Science Forum
Volume225-227
Issue numberPART 1
Publication statusPublished - Dec 1 1996

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Keywords

  • Amorphization
  • Extended Solid Solution
  • Mechanical Alloying
  • Phase Transition

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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