Change in Vickers hardness at the glass transition region for fragile and strong glasses

T. Watanabe, Y. Benino, T. Komatsu

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

The temperature dependence of Vickers hardness between room temperature and around the glass transition temperature Tg in a vacuum for some glasses with different fragile characters was measured. The hardness at T/Tg<0.9 decreases gradually with increasing temperature, but the glasses show unique temperature dependences in the range 0.9<T/Tg<1.1 depending on their fragile character. A sharp decrease in hardness is observed at around T/Tg=0.9-1.0 for fragile Bi2O3- and TeO2-based glasses, but 50CuOx·50P2O5 and soda-lime silicate glasses with strong viscosity characteristics still have relatively large Vickers hardness even at Tg and the hardness drops to almost zero around T/Tg=1.05-1.1. It is suggested that for fragile glasses the β-relaxation has an important effect on the Vickers hardness change near the glass transition region, but for strong glasses it is the α-relaxation that governs the hardness near Tg.

Original languageEnglish
Pages (from-to)141-145
Number of pages5
JournalJournal of Non-Crystalline Solids
Volume286
Issue number3
DOIs
Publication statusPublished - Jul 1 2001
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Materials Chemistry

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