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<p>Cr<sub><i>x</i></sub>CoFeNiAl (<i>x</i> = 0, 0.2, 0.4, 0.6, 0.8, molar ratio) HEAs were prepared by directional solidification at the withdraw rate of 200&#xa0;μm/s and were simply referred to as Cr0, Cr0.2, Cr0.4, Cr0.6 and Cr0.8 alloy, respectively. During solidification, the crystal lattice structure of alloys maintained body-centered cubic (BCC) crystal structure. The microstructure transformed from equiaxed dendrites to dendritic dendrites and the grain size decreased. Specifically, during the following cooling process, Al and Ni were prone to segregate to the dendrite trunk, while Cr and Fe segregated to interdendrite. Moreover, as the Cr content increased, the Cr<sub><i>x</i></sub>CoFeNiAl HEAs ultimate compressive strength gradually increased. The Cr0.8 alloy achieved the supreme ultimate compressive strength of 2760&#xa0;MPa, the increase reached 215.4%. Meanwhile, the compressive strain consistently increased with increasing Cr content, reaching the maximum of 38.59% for the Cr0.8 attributed to grain refinement strengthening caused by the addition of Cr.</p>

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Effect of Cr on the Microstructure and Compressive Properties of CrxCoFeNiAl High Entropy Alloys Prepared by Directional Solidification

  • 期刊论文

  • 发表日期：

    2025年10月27日

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  • Zhuhuan Yu,
  • Zi Yang,
  • Xiong Yang,
  • Tianxiao Ma,
  • Xirui Shangguan

摘要

CrxCoFeNiAl (x = 0, 0.2, 0.4, 0.6, 0.8, molar ratio) HEAs were prepared by directional solidification at the withdraw rate of 200 μm/s and were simply referred to as Cr0, Cr0.2, Cr0.4, Cr0.6 and Cr0.8 alloy, respectively. During solidification, the crystal lattice structure of alloys maintained body-centered cubic (BCC) crystal structure. The microstructure transformed from equiaxed dendrites to dendritic dendrites and the grain size decreased. Specifically, during the following cooling process, Al and Ni were prone to segregate to the dendrite trunk, while Cr and Fe segregated to interdendrite. Moreover, as the Cr content increased, the CrxCoFeNiAl HEAs ultimate compressive strength gradually increased. The Cr0.8 alloy achieved the supreme ultimate compressive strength of 2760 MPa, the increase reached 215.4%. Meanwhile, the compressive strain consistently increased with increasing Cr content, reaching the maximum of 38.59% for the Cr0.8 attributed to grain refinement strengthening caused by the addition of Cr.