Nanoindentation response of Cu-Ti based metallic glasses: Comparison between as-cast, relaxed and devitrified states

B. B. Medeiros, M. M. Medeiros, J. Fornell, J. Sort, M. D. Baró, A. M. Jorge

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26 Citations (Scopus)

Abstract

© 2015 Elsevier B.V. All rights reserved. Cu<inf>36</inf>Ti<inf>34</inf>Zr<inf>22</inf>Ni<inf>8</inf> glassy ribbons were synthesized by melting spinning. The effects of annealing treatments on the microstructure and mechanical properties of this alloy are investigated. Annealing below the crystallization temperature induces a reduction of free volume, as evidenced by differential scanning calorimetry. Annealing at sufficiently high temperatures promotes the formation of stable CuTi, NiTi and Zr-Ti-Cu phases. The as-spun alloy exhibits high hardness (H > 8 GPa), moderate reduced Young's modulus (E<inf>r</inf> ≈90 GPa) and good wear resistance. These properties are enhanced after thermal treatments (H > 13 GPa and E<inf>r</inf> ≈140 GPa are achieved in the fully crystallized sample). The mechanical hardening is accompanied with an increase of the elastic recovery. The influence of free volume on these annealing-induced changes in the mechanical properties is discussed.
Original languageEnglish
Pages (from-to)103-109
JournalJournal of Non-Crystalline Solids
Volume425
DOIs
Publication statusPublished - 15 Jun 2015

Keywords

  • Amorphous alloys
  • Nanoindentation
  • Rapid solidification

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