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<p>In this paper, CoCrNiTi<sub><i>x</i></sub>(<i>x</i> = 0.1, 0.3, 0.5) medium-entropy alloy (MEA) was prepared by powder plasma arc additive manufacturing (PPA-AM). The effects of Ti addition on the microstructure and mechanical properties of the alloy were studied. Results show that CoCrNiTi<sub>0.1</sub>MEA only has FCC phase, the alloy has a lower hardness of 170&#xa0;HV, a lower tensile strength of 605&#xa0;MPa and a higher elongation of 61.4%. With the increase in Ti content, intermetallic (IM) <i>σ</i> phase and <i>η</i> phase were observed in CoCrNiTi<sub>0.3</sub>MEA, the formation of <i>σ</i> phase depended on the precipitation of <i>η</i> phase during solidification. The hardness of the alloy increased to 439&#xa0;HV and the tensile strength increased to 953&#xa0;MPa, while elongation is reduced to 2.5%. When the Ti content further increases, the <i>σ</i> phase is obviously coarsened in CoCrNiTi<sub>0.5</sub>MEA, and FCC accounts for less in the alloy at this time. Due to the large lattice mismatch between the <i>σ</i> phase and FCC phase, the alloy shows a higher hardness of 659&#xa0;HV. In addition, with the increase in Ti content, the friction coefficient of the alloy decreases from 0.4260 (Ti<sub>0.1</sub>MEA) to 0.3919 (Ti<sub>0.3</sub>MEA) and 0.3629 (Ti<sub>0.5</sub>MEA). The wear resistance of the alloy is obviously improved.</p>

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Effect of Ti Addition on Microstructure and Mechanical Properties of CoCrNiTix(x = 0.1, 0.3, 0.5) Medium-Entropy Alloys Manufactured by Powder Plasma Arc Additive Manufacturing

  • 期刊论文

  • 发表日期：

    2026年6月15日

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  • Yuhui Jin,
  • Ming Wen,
  • Wenjun Wu,
  • Chuanchu Su,
  • Liuwei Wu,
  • Xizhang Chen

摘要

In this paper, CoCrNiTix(x = 0.1, 0.3, 0.5) medium-entropy alloy (MEA) was prepared by powder plasma arc additive manufacturing (PPA-AM). The effects of Ti addition on the microstructure and mechanical properties of the alloy were studied. Results show that CoCrNiTi0.1MEA only has FCC phase, the alloy has a lower hardness of 170 HV, a lower tensile strength of 605 MPa and a higher elongation of 61.4%. With the increase in Ti content, intermetallic (IM) σ phase and η phase were observed in CoCrNiTi0.3MEA, the formation of σ phase depended on the precipitation of η phase during solidification. The hardness of the alloy increased to 439 HV and the tensile strength increased to 953 MPa, while elongation is reduced to 2.5%. When the Ti content further increases, the σ phase is obviously coarsened in CoCrNiTi0.5MEA, and FCC accounts for less in the alloy at this time. Due to the large lattice mismatch between the σ phase and FCC phase, the alloy shows a higher hardness of 659 HV. In addition, with the increase in Ti content, the friction coefficient of the alloy decreases from 0.4260 (Ti0.1MEA) to 0.3919 (Ti0.3MEA) and 0.3629 (Ti0.5MEA). The wear resistance of the alloy is obviously improved.