Cooling process and cast structure of Zr-Al-Ni-Cu-based bulk metallic glasses produced in various atmospheres

J. Saida, A. D. Setyawan, H. Kato, A. Inoue

研究成果: Article査読

9 被引用数 (Scopus)

抄録

Cooling process in the production of Zr65Al7.5Ni 10Cu17.5-based bulk metallic glasses (BMGs) was investigated in various chamber atmospheres in Cu mold casting. Two different cooling modes, consisting of the direct heat transfer between the melt and Cu mold in the high temperature and indirect transfer via cavity in the low-temperature regions, are suggested. In the later case, the cooling effect should depend on the chamber atmosphere, which results in the formation of glassy structure with large relaxation enthalpy casting under the ambient Ar and He atmospheres due to a good thermal conductivity. The less relaxed BMGs produced by an improved cooling effect are also expected to contain a large amount of free volume for significant deformability. Actually, it is clarified that the compressive plastic deformation is improved with an increase of the relaxation enthalpy. The present study indicates a necessity of development of the glassy structure, i.e., relaxation state, and provides a new technique of the formation of less relaxed glassy structure for the improvement of plasticity in BMGs.

本文言語English
ページ(範囲)1450-1455
ページ数6
ジャーナルMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
42
6
DOI
出版ステータスPublished - 2011 6 1

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys

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