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<p>Refractory high-entropy alloys (RHEAs) are promising candidates as potential high-temperature materials. However, the high density and poor room-temperature ductility limit their industrial applications. In this study, a series of lightweight RHEAs with the compositions of (NbTiV)<sub>100-<i>x</i></sub>B<sub><i>x</i></sub> and (NbTiV)<sub>100-<i>x</i></sub>C<sub><i>x</i></sub> (<i>x</i> = 0.5, 1, 5, 10 and 15) were designed and prepared by microalloying with boron (B) and carbon (C). The microstructure evolution and mechanical properties of these alloys were systematically investigated. The results revealed that with increasing alloying content, the matrix phase in (NbTiV)<sub>100−<i>x</i></sub>B<sub><i>x</i></sub> alloys transitioned from dual body-centered cubic (bcc<sub>1</sub> and bcc<sub>2</sub>) solid solutions to a singular bcc<sub>2</sub> phase, whereas the (NbTiV)<sub>100−<i>x</i></sub>C<sub><i>x</i></sub> alloys exhibited a structural evolution from a bcc configuration to a face-centered cubic (fcc) arrangement. The (NbTiV)<sub>90</sub>B<sub>10</sub> and (NbTiV)<sub>90</sub>C<sub>10</sub> alloys exhibited excellent room-temperature mechanical properties, with compressive strengths of 1494&#xa0;MPa and 1466&#xa0;MPa and fracture strains of 25% and 29%, respectively. At elevated temperatures (800-1000 °C), the strengths of (NbTiV)<sub>90</sub>B<sub>10</sub> and (NbTiV)<sub>90</sub>C<sub>10</sub> alloys decreased from 943&#xa0;MPa and 1042&#xa0;MPa to 326&#xa0;MPa and 358&#xa0;MPa, respectively. Notably, although both alloys achieve a balance between low density and outstanding mechanical properties, the (NbTiV)<sub>90</sub>C<sub>10</sub> alloy demonstrates superior strength to the (NbTiV)<sub>90</sub>B<sub>10</sub> alloy at all temperatures. This study provides a new approach for developing lightweight RHEAs with enhanced performance for medium-temperature applications.</p>

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Study on Microstructure Evolution and Mechanical Properties of New Lightweight (NbTiV)100-xBx/Cx High-Entropy Alloys

  • 期刊论文

  • 发表日期：

    2025年7月1日

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  • Ruiyuan Wang,
  • Ning Zhao,
  • Daohe Zhang,
  • Shiwen Hu,
  • Xiaoqiang Li,
  • Dexue Liu

摘要

Refractory high-entropy alloys (RHEAs) are promising candidates as potential high-temperature materials. However, the high density and poor room-temperature ductility limit their industrial applications. In this study, a series of lightweight RHEAs with the compositions of (NbTiV)100-xBx and (NbTiV)100-xCx (x = 0.5, 1, 5, 10 and 15) were designed and prepared by microalloying with boron (B) and carbon (C). The microstructure evolution and mechanical properties of these alloys were systematically investigated. The results revealed that with increasing alloying content, the matrix phase in (NbTiV)100−xBx alloys transitioned from dual body-centered cubic (bcc1 and bcc2) solid solutions to a singular bcc2 phase, whereas the (NbTiV)100−xCx alloys exhibited a structural evolution from a bcc configuration to a face-centered cubic (fcc) arrangement. The (NbTiV)90B10 and (NbTiV)90C10 alloys exhibited excellent room-temperature mechanical properties, with compressive strengths of 1494 MPa and 1466 MPa and fracture strains of 25% and 29%, respectively. At elevated temperatures (800-1000 °C), the strengths of (NbTiV)90B10 and (NbTiV)90C10 alloys decreased from 943 MPa and 1042 MPa to 326 MPa and 358 MPa, respectively. Notably, although both alloys achieve a balance between low density and outstanding mechanical properties, the (NbTiV)90C10 alloy demonstrates superior strength to the (NbTiV)90B10 alloy at all temperatures. This study provides a new approach for developing lightweight RHEAs with enhanced performance for medium-temperature applications.