Reversible deformation-induced martensitic transformation in Al0.6CoCrFeNi high-entropy alloy investigated by in situ synchrotron-based high-energy X-ray diffraction

Lili Ma, Lu Wang, Zhihua Nie, Fuchi Wang, Yunfei Xue*, Jinlian Zhou, Tangqing Cao, Yandong Wang, Yang Ren

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

99 Citations (Scopus)

Abstract

The micro-mechanical behavior of Al0.6CoCrFeNi high-entropy alloy during tensile deformation was investigated using an in situ synchrotron-based high-energy X-ray diffraction technique. The alloy consisted of face-center-cubic (FCC) and body-center-cubic-based (BCC-based) structure accompanied by a small amount of σ phase. The FCC phase yielded prior to the BCC-based phase during the tensile loading, and the BCC-based phase bore more stress partition during the plastic deformation stage in spite of only ∼23% volume fraction. A reversible deformation-induced martensitic transformation from the BCC-based phase to orthorhombic phase was observed during the plastic deformation stage. The transformation preferentially occurred in the grains with an orientation of B-[001]//loading direction and B-[110]//transverse direction. The study characterized the micro-mechanical behavior of this alloy, and the reversible martensitic transformation is believed to be beneficial to the fracture toughness of such alloys.

Original languageEnglish
Pages (from-to)12-21
Number of pages10
JournalActa Materialia
Volume128
DOIs
Publication statusPublished - 15 Apr 2017

Keywords

  • High-energy X-ray diffraction
  • High-entropy alloy
  • Lattice strain
  • Martensitic transformation
  • Micro-mechanical behavior

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