Glass-forming ability and crystallization of high purity Pd-Cu-Ni-P alloy

Nobuyuki Nishiyama, Mitsuhide Matsushita, Akihisa Inoue

研究成果: Conference article査読

抄録

Glass-forming ability, thermal stability and nucleation behavior of a Pd40Cu30Ni10P20 alloy prepared using a high purity polycrystalline phosphorus are investigated. The critical cooling rate for glass formation for the high purity alloy is the same as that for the previous result, but the improvement of undercooling reaches about 80 K as compared with the fluxed ordinary alloy. In comparison with the non-fluxed alloy, the solidified structure of the present highly purified alloy is significantly different. The non-fluxed sample shows the characteristic "island-like" structure consisted of acicular fcc-Pd2Ni2P solid solution and Cu3Pd intermetallic compound. These acicular phases appear to be caused by the growth of quenched-in nuclei. In the isothermal experiment, nucleus density exhibits time dependence even at 683 K near the nose temperature. It is assumed that the crystallization behavior for the highly purified alloy is closer to homogeneous nucleation from quenched-in nuclei dominant behavior. In order to investigate the nucleation behavior, in-situ TEM observation was carried out. Spherical Pd15P2 particle with a diameter about 15 nm is observed, and this spherical region repeats generation and annihilation during isothermal annealing. The reason for the high glass-forming ability is discussed on the basis of the obtained results.

本文言語English
ページ(範囲)L3.1.1-L3.1.12
ジャーナルMaterials Research Society Symposium - Proceedings
644
出版ステータスPublished - 2001 12 1
イベントSupercooled Liquid, Bulk Glassy and Nanocrystalline states of Alloys - Boston, MA, United States
継続期間: 2000 11 272000 11 30

ASJC Scopus subject areas

  • 材料科学(全般)
  • 凝縮系物理学
  • 材料力学
  • 機械工学

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