Design and microstructure analysis of globules in Al-Co-La-Pb immiscible alloys with an amorphous phase

Takeshi Nagase, Mamoru Takemura, Mitsuaki Matsumuro, Megumi Matsumoto, Yoshikazu Fujii

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

An immiscible alloy with an amorphous phase, Al-Co-La-Pb, was designed by the combination of empirical rules, prediction of phase diagrams based on ab initio calculations, and thermodynamic calculations. The solidification microstructure of rapidly solidified Al-Co-La-Pb melt-spun ribbons was investigated. Liquid-phase separation and the formation of an amorphous phase occurred simultaneously in the Al-Co-La-Pb alloy, resulting in the formation of Pb globules embedded in the Al-Co-La–based amorphous matrix. The particle size distribution of the globules and the formation of Pb nanoglobules were explained by the multistep liquid-phase separation. STEM observation clarified the microstructure of oxygen-enriched globules with double shell layers in the Al-Co-La-Pb alloy.

Original languageEnglish
Pages (from-to)338-345
Number of pages8
JournalMaterials and Design
Volume117
DOIs
Publication statusPublished - 2017 Mar 5
Externally publishedYes

Keywords

  • Alloy design
  • Amorphous material
  • Composite material
  • Electron microscopy
  • Microstructure
  • Solidification

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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