Alloy Design and Fabrication of Ingots of Al-Mg-Li-Ca Light-Weight Medium Entropy Alloys

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  • Nagase Takeshi
    Research center for Ultra-High Voltage Electron Microscopy, Osaka University Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University
  • Terayama Akira
    Hiroshima Prefectural Technology Research Institute
  • Nagaoka Takashi
    Hiroshima Prefectural Technology Research Institute
  • Fuyama Nobuyuki
    Hiroshima Prefectural Technology Research Institute
  • Sakamoto Tatsuaki
    Department of Materials Science and Biotechnology, Graduate School of Science and Engineering, Ehime University

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Other Title
  • Al-Mg-Li-Ca系軽量ミディアムエントロピー合金の合金設計と鋳造材の作製
  • Al-Mg-Li-Caケイ ケイリョウ ミディアムエントロピー ゴウキン ノ ゴウキン セッケイ ト チュウゾウザイ ノ サクセイ

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Abstract

<p>  Alloy designs of light-weight high and medium entropy alloys (LW-HEA and LW-MEA, respectively) are discussed in relation to solving the problem of the empirical alloy parameter, ΔHmix, and the difficulties of the fabrication process. The ingots of newly-designed Al-Mg-Li-Ca LW-MEAs were fabricated by the conventional casting process via crucible melting without using a vacuum furnace, and cast under air atmosphere. The ΔHmix parameter is the average value of the mixing enthalpy of ΔHi-j between the two components, i-j, in multicomponent alloys, and the dispersion of ΔHi-j cannot be evaluated. The parameter δ (ΔHmix) was suggested for the evaluation of the dispersion of ΔHi-j. The Al-Mg-Li-Ca LW-MEAs were designed based on empirical alloy parameters, including δ (ΔHmix). The alloy ingots of equiatomic AlMgLiCa, non-equiatomic Al2MgLiCa, and AlMgLiCa0.3 were successfully obtained by the conventional casting process. The solidification microstructure of the ingots in the Al2MgLiCa LW-MEA was investigated, with particular focus on the position dependences of the chemical composition, constituent phases, solidification microstructure, and hardness. The present study clarified that LW-HEAs and LW-MEAs containing Al, Mg, Li, and Ca can be obtained by the conventional casting process under air atmosphere, without specific expensive casting equipment.</p>

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