Designing Zr-Cu-Co-Al bulk metallic glasses with phase separation mediated plasticity

Jin Man Park, Jun Hee Han, Norbert Mattern, Do Hyang Kim, Jurgen Eckert

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

New Zr-based bulk metallic glasses (BMGs) with improved plasticity were developed in the Zr-Cu-Co-Al system by a combination of Zr45Cu50Al5 and Zr55Co25Al20 BMGs with a certain concentration ratio. The compressive plasticity of the investigated alloys depends strongly on the concentration ratio of the two BMGs. Because of the positive enthalpy of mixing between Cu and Co (DHCu-Co = +9 kJ/mol), a strong repulsive interaction between Cu and Co is introduced, whereas an attractive interaction exists among the other constituent elements in the liquid state. When two BMGs are combined at a 1:1 concentration ratio, a maximum compressive plasticity of ~12 pct is achieved for the Zr50Cu25Co12.5Al12.5 BMG. The plasticity enhancement is attributed to atomic-scale chemical/structural fluctuations achieved through liquid-phase separation.

Original languageEnglish
Pages (from-to)2598-2603
Number of pages6
JournalMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Volume43
Issue number8
DOIs
Publication statusPublished - 2012 Aug

All Science Journal Classification (ASJC) codes

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

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