Nanoscale phase separation in a fcc-based CoCrCuFeNiAl0.5 high-entropy alloy

X. D. Xu, P. Liu, S. Guo, A. Hirata, T. Fujita, T. G. Nieh, C. T. Liu, M. W. Chen*

*この研究の対応する著者

研究成果: Article査読

150 被引用数 (Scopus)

抄録

Nano-scale phase separation is reported in a nominal single-phase, high-entropy alloy (HEA), which was characterized using scanning transmission electron microscopy (STEM) combined with atom probe tomography (APT). Despite the fact that X-ray diffraction exhibits a single face-centered-cubic (fcc) phase feature of the as-cast alloy prepared by melt spinning, selected area electron diffraction reveals weak L12 ordering in the as-spun alloy. High-resolution STEM shows the presence of two coherent nanophases with distinct L12 and fcc structures, coupling with compositional segregations. The ordering of the L12 domains is enhanced after annealing at 500 °C. Electron energy loss spectroscopy and APT analyses reveal that the L12 nano-phase is enriched with Fe, Co, Cr and Ni, while the fcc domains are a Cu-rich phase. The nano-scale phase separation can effectively minimize the lattice distortions caused by the atomic size difference in the constituent elements, which may offer structural insights into the unusual mechanical behavior and phase stability of fcc HEA.

本文言語English
ページ(範囲)145-152
ページ数8
ジャーナルActa Materialia
84
DOI
出版ステータスPublished - 2015 2月 1
外部発表はい

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • セラミックおよび複合材料
  • ポリマーおよびプラスチック
  • 金属および合金

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