Microstructure refinement for superior ductility of Al–Si alloy by electron beam melting

Huakang Bian, Kenta Aoyagi, Yufan Zhao, Chikatoshi Maeda, Toshihiro Mouri, Akihiko Chiba

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

Refining the microstructure to improve the ductility of an Al‒Si alloy is challenging. In this paper, we report for the first time a novel microstructure refinement approach for AlSi10Mg (wt%) alloys using electron beam melting (EBM) technology, without the addition of any modification elements. The synergetic effect of superheating, fast cooling, and preheating contributes to a refined Si phase with a fine granular structure (0.5–2 μm) within bimodal Al grains (40 μm grains and 0.5–2 μm sub-grains). The results provide good evidence for the proposed refinement mechanism. A maximum ductility of approximately 32.7 % with a tensile strength of approximately 136 MPa was achieved for the as-built AlSi10Mg EBM alloy. After solution heat treatment and T6-like aging, nano-Si precipitates formed which strengthened the alloys. The pathway developed in this study for refining the Al–Si alloy microstructure to improve the tensile ductility will provide a feasible and fast manufacturing method for improving the microstructure and mechanical properties of other low-melting temperature alloys in the near future using EBM technology.

Original languageEnglish
Article number100982
JournalAdditive Manufacturing
Volume32
DOIs
Publication statusPublished - 2020 Mar

Keywords

  • Additive manufacturing
  • AlSi10Mg alloy
  • EBM
  • Superior ductility

ASJC Scopus subject areas

  • Biomedical Engineering
  • Materials Science(all)
  • Engineering (miscellaneous)
  • Industrial and Manufacturing Engineering

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