4.7 Article

A novel as-cast precipitation-strengthened Al0.5V0.1FeCrMnNi0.9 high-entropy alloy with high strength and plasticity

Journal

SCIENCE CHINA-TECHNOLOGICAL SCIENCES
Volume 64, Issue 9, Pages 1920-1926

Publisher

SCIENCE PRESS
DOI: 10.1007/s11431-021-1866-8

Keywords

high-entropy alloy; microstructure; mechanical properties; precipitation strengthening

Funding

  1. National Key Research and Development Program of China [2019YFA0209901, 2018YFA0702901]
  2. Liao Ning Revitalization Talents Program [XLYC1807047]
  3. Fund of Science and Technology on Reactor Fuel and Materials Laboratory [6142A06190304]
  4. Fund of the State Key Laboratory of Solidification Processing in NWPU [SKLSP201902]
  5. China Postdoctoral Science Foundation [2020M670747]

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The novel Al0.5V0.1FeCrMnNi0.9 high-entropy alloy demonstrates exceptional strength and plasticity, with coherent precipitation enhancement contributing to its superior performance. The alloy exhibits high compressive yield strength, fracture strength, and fracture strain, along with a strength and plasticity product that surpasses most reported high-entropy alloys.
A novel Al0.5V0.1FeCrMnNi0.9 high-entropy alloy was designed to achieve enhanced strength and plasticity. The as-cast Al0.5V0.1FeCrMnNi0.9 alloy shows a typical dendritic microstructure consisting of a body-centered cubic-structured matrix phase and a B2-structured nanoprecipitate phase. Nanoprecipitates are homogeneous and dispersed in the matrix. The as-cast Al0.5V0.1FeCrMnNi0.9 alloy exhibits a compressive yield strength of 1.104 GPa, a fracture strength of 2.926 GPa, and a fracture strain of 45.7%. The product of strength and plasticity of this alloy is 133.72 GPa%, which is superior to that of most of the reported high-entropy alloys. The strengthening mechanisms were evaluated in detail, which indicates that the coherent precipitation enhancement contributes to the unusually high strength and plasticity.

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