Solidification Microstructures in 3d-transition Metal High Entropy Alloys with Cu Element

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  • Nagase Takeshi
    Department of Materials and Synchrotron Radiation Engineering, Graduate school of Engineering, University of Hyogo
  • Tamura Takuya
    Magnetic Powder Metallurgy Research Center, National Institute of Advanced Industrial Science and Technology (AIST)

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Other Title
  • 銅（Cu）を含む3d遷移金属ハイエントロピー合金の凝固組織
  • ドウ(Cu)オ フクム 3d センイ キンゾク ハイエントロピー ゴウキン ノ ギョウコ ソシキ

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Abstract

<p>High entropy alloys (HEAs) with Cu as the main constituent element were investigated focusing on the distribution of Cu in the ingots in this study. Based on the taxonomy of HEAs, the HEAs with Cu elements for casting materials were classified into two groups. The two groups were：(1) HEAs whose main constituent elements were 3d-transition metals such as Co, Cr, Fe, Mn, Ni, Cu (3d-HEAs), and (2) HE brasses based on Cu-Zn alloy system and HE bronzes based on Cu-Sn and/or Cu-Al alloy systems. Focusing on 3d-HEAs with Cu, the distribution of Cu in the ingots showed the following tendency：(1-1) the segregation from dendrite to the residual liquid, resulting in the formation of a Cu-rich interdendrite region in the ingots；(1-2) liquid phase separation resulting in the formation of a Cu-rich liquid, which formed a macroscopically phase-separated structure；(1-3) the dispersion of fine Cu particles embedded in the solid solution matrix.</p>

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