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<p>The microstructure, mechanical properties, and wear properties of mechanically alloyed and spark plasma sintered AlCoCrFeNi<sub>2.1</sub> high-entropy alloys (HEAs) have been investigated. AlCoCrFeNi<sub>2.1</sub> powders up to 50&#xa0;h of milling and the powders were consolidated at 900°C, 1000°C, 1100°C for 15&#xa0;min under a uniaxial pressure of 50&#xa0;MPa. The results show that the AlCoCrFeNi<sub>2.1</sub> sintered alloy mainly consists of BCC and FCC phases, with a small amount of Al<sub>2</sub>O<sub>3</sub> and Cr<sub>7</sub>C<sub>3</sub> phases. The AlCoCrFeNi<sub>2.1</sub> sintered alloys exhibit high Vickers hardness with 732 HV, 620 HV, and 593 HV, respectively. The sintered alloys at 1000&#xa0;°C shows excellent comprehensive mechanical properties, with compressive fracture strength, compressive strain, and Vickers hardness of 1796&#xa0;MPa, 6.4%, and 620 HV, respectively. Moreover, the wear rate of gradually decreases from 1.6 × 10<sup>-5</sup> to 3.0 × 10<sup>-6</sup>mm<sup>3</sup>, the friction coefficient and mass loss also gradually decrease with increasing sintering temperature. Wherein the sintered alloy at 1100&#xa0;°C showed the best wear resistance, the wear rate of 3.0 × 10<sup>-6</sup>mm<sup>3</sup>, friction coefficient of 0.55, and mass loss of 0.01&#xa0;g. The wear mechanism was abrasive wear with slight adhesive wear.</p>

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Influence of Sintering Temperature on Microstructure and Properties of AlCoCrFeNi2.1 High-Entropy Alloy

  • 期刊论文

  • 发表日期：

    2025年4月23日

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  • Taoran Zhang,
  • Li Li

摘要

The microstructure, mechanical properties, and wear properties of mechanically alloyed and spark plasma sintered AlCoCrFeNi2.1 high-entropy alloys (HEAs) have been investigated. AlCoCrFeNi2.1 powders up to 50 h of milling and the powders were consolidated at 900°C, 1000°C, 1100°C for 15 min under a uniaxial pressure of 50 MPa. The results show that the AlCoCrFeNi2.1 sintered alloy mainly consists of BCC and FCC phases, with a small amount of Al2O3 and Cr7C3 phases. The AlCoCrFeNi2.1 sintered alloys exhibit high Vickers hardness with 732 HV, 620 HV, and 593 HV, respectively. The sintered alloys at 1000 °C shows excellent comprehensive mechanical properties, with compressive fracture strength, compressive strain, and Vickers hardness of 1796 MPa, 6.4%, and 620 HV, respectively. Moreover, the wear rate of gradually decreases from 1.6 × 10-5 to 3.0 × 10-6mm3, the friction coefficient and mass loss also gradually decrease with increasing sintering temperature. Wherein the sintered alloy at 1100 °C showed the best wear resistance, the wear rate of 3.0 × 10-6mm3, friction coefficient of 0.55, and mass loss of 0.01 g. The wear mechanism was abrasive wear with slight adhesive wear.