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A high-entropy alloy with hierarchical nanoprecipitates and ultrahigh strength

  • Author(s): Fu, Zhiqiang
  • Jiang, Lin
  • Wardini, Jenna L
  • MacDonald, Benjamin E
  • Wen, Haiming
  • Xiong, Wei
  • Zhang, Dalong
  • Zhou, Yizhang
  • Rupert, Timothy J
  • Chen, Weiping
  • Lavernia, Enrique J
  • et al.
Abstract

High-entropy alloys (HEAs) are a class of metallic materials that have revolutionized alloy design. They are known for their high compressive strengths, often greater than 1 GPa; however, the tensile strengths of most reported HEAs are limited. Here, we report a strategy for the design and fabrication of HEAs that can achieve ultrahigh tensile strengths. The proposed strategy involves the introduction of a high density of hierarchical intragranular nanoprecipitates. To establish the validity of this strategy, we designed and fabricated a bulk Fe25Co25Ni25Al10Ti15 HEA to consist of a principal face-centered cubic (fcc) phase containing hierarchical intragranular nanoprecipitates. Our results show that precipitation strengthening, as one of the main strengthening mechanisms, contributes to a tensile yield strength (σ0.2) of ~1.86 GPa and an ultimate tensile strength of ~2.52 GPa at room temperature, which heretofore represents the highest strength reported for an HEA with an appreciable failure strain of ~5.2%.

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