Glass transition Tg, and quenched-in free volume in bulk metallic glasses measured by X-ray diffraction

A. R. Yavari, A. Le Moulec, N. Nishiyama, A. Inoue, G. Vaughan, A. Kvick, W. J.F. Botta

研究成果: Conference article査読

2 被引用数 (Scopus)


In this work we show that through thermal expansion am measured by real-time diffraction using synchrotron light in transmission, the "glass transition Tg" and for the first time, the "quenched-in free volume" can be quantitatively measured in bulk metallic glasses. This was impossible previously as metallic glasses with crystallisation temperature Tx near Tg crystallized during real-time diffraction experiments. This limitation does not hold for newly developed bulk metallic glasses (BMGs) with large supercooled regions ΔT = Tx-T g. Under such conditions, the variation, Δαth, of the volume coefficient of thermal expansion has been measured by diffraction near Tg for a number of bulk metallic glasses. A clear Δαth has been detected in the same glass transition temperature range of ΔCp measured by DSC calorimetry in particular for Pd-based, Zr-based and Hf-based bulk glasses. The directly measured quenched-in free-volume content Vf is reported here for the first time is found, as expected, to depend on the quench rate and anneals out just below Tg.

ジャーナルJournal of Metastable and Nanocrystalline Materials
出版ステータスPublished - 2004 1 1
イベントProceedings of the 10th International Symposium on Metastable Mechanically Alloyed and Nanocrystalline Materials (ISMANAM-2002) - Foz do Ifuacu, Brazil
継続期間: 2003 8 242003 8 28

ASJC Scopus subject areas

  • Materials Science (miscellaneous)
  • Materials Science(all)
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry

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