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<p>The effects of the molybdenum (Mo) addition on the phase stability, microstructure, and mechanical properties of high-entropy AlCoCrFeNi<sub>2.1</sub>Mo<sub><i>x</i></sub> alloys were investigated. The results demonstrate that Mo addition reduces the ordering degree in the Al-Co-Cr-Fe-Ni system and refines the microstructure. The microstructure remained a BCC + B2 dual-phase structure; however, the Mo addition caused the transformation of the B2 phase morphology from a typical lamellar eutectic structure to a nano-lamellar decomposed structure, and the B2 phase became clearly coarsened as the Mo content increased. Additionally, the Mo addition resulted in significant lattice distortion, produced a variety of strengthening mechanisms, and caused the superior compressive mechanical properties of the AlCoCrFeNi<sub>2.1</sub>Mo<sub>0.1</sub> alloy.</p>

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Effect of Molybdenum on Nano-precipitation Mechanism and Properties of High-Entropy AlCoCrFeNi2.1Mox Alloys

  • 期刊论文

  • 发表日期：

    2025年11月5日

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  • Minghong Sha,
  • Qingtao Guo,
  • Chen Zhang,
  • Yu’an Jing,
  • Tiandang Huang,
  • Xingang Ai,
  • Shengli Li

摘要

The effects of the molybdenum (Mo) addition on the phase stability, microstructure, and mechanical properties of high-entropy AlCoCrFeNi2.1Mox alloys were investigated. The results demonstrate that Mo addition reduces the ordering degree in the Al-Co-Cr-Fe-Ni system and refines the microstructure. The microstructure remained a BCC + B2 dual-phase structure; however, the Mo addition caused the transformation of the B2 phase morphology from a typical lamellar eutectic structure to a nano-lamellar decomposed structure, and the B2 phase became clearly coarsened as the Mo content increased. Additionally, the Mo addition resulted in significant lattice distortion, produced a variety of strengthening mechanisms, and caused the superior compressive mechanical properties of the AlCoCrFeNi2.1Mo0.1 alloy.