Enhance the thermal stability and glass forming ability of Al-based metallic glass by Ca minor-alloying

J. Q. Wang, Y. H. Liu, S. Imhoff, N. Chen, D. V. Louzguine-Luzgin, A. Takeuchi, M. W. Chen, H. Kato, J. H. Perepezko, A. Inoue

Research output: Contribution to journalArticle

52 Citations (Scopus)

Abstract

In order to stabilize the supercooled liquid and enhance the glass forming ability of Al-based glass forming alloy, the alloying design based on minor Ca substitution for Al was examined to retard the precipitation of face-centered-cubic (FCC) Al. Calcium was selected as the alloying element, because it has a large negative mixing heating with Al but a positive value with the other components. This is anticipated to facilitate formation of Al-Ca clusters and then inhibit the diffusion of Al atoms which is thought to be the dominant reason that limits the glass forming ability (GFA) of Al-based alloys. The proposed strategy was confirmed in experiments by the observation of a greatly increased reduced glass transition temperature, T rg = T g/T l (T g the glass transition temperature and T l the liquidus temperature), the increased the activation energy for crystallization, and the increased activation energy for diffusion. The Al 85-xY 8Ni 5Co 2Ca x (x = 0.5-5) system is found to possess extraordinarily high T rg = 0.613 far exceeding that for any known Al-based glass forming alloys.

Original languageEnglish
Pages (from-to)35-40
Number of pages6
JournalIntermetallics
Volume29
DOIs
Publication statusPublished - 2012 Oct 1

Keywords

  • A. Aluminides, miscellaneous
  • B. Alloy design
  • B. Glasses, metallic
  • B. Microalloying
  • B. Thermal properties

ASJC Scopus subject areas

  • Chemistry(all)
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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