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<p>In this work, CoCrCu<sub>0.1</sub>FeMoNi high-entropy alloy was prepared by electromagnetic induction melting and followed by laser remelting to investigate the effect of different metallurgical processes on microstructures and properties. Many bulk dendrites and eutectic structures were observed in the microstructures of induction-melted CoCrCu<sub>0.1</sub>FeMoNi high-entropy alloy. Ultrafine microstructures were obtained in the laser-remelted layer for the reason of rapid solidification. Various microstructures were obtained, and the formation mechanism was discussed in detail. Both as-cast and laser-remelted CoCrCu<sub>0.1</sub>FeMoNi high-entropy alloys show component phases of FCC, BCC, <i>σ</i> and <i>μ</i>. However, the volume fraction of FCC decreased while the volume fraction of BCC increased with the increasing scanning speed from 200 to 800&#xa0;mm/min at a laser power of 240&#xa0;W. Additionally, the laser-remelted layers were dramatically strengthened, and excellent wear resistance was achieved. The as-cast CoCrCu<sub>0.1</sub>FeMoNi high-entropy alloy showed severe adhesion, abrasion and oxidation wear, and mild adhesion and oxidation wear can be observed on the friction surface of the laser-remelted layers. Accordingly, the wear rates of CoCrCu<sub>0.1</sub>FeMoNi high-entropy alloy decrease from 1.34 × 10<sup>−7&#xa0;</sup>mm<sup>3</sup>/N&#xa0;m (as-cast) to 0.65 × 10<sup>−7&#xa0;</sup>mm<sup>3</sup>/N&#xa0;m (laser melted at 800&#xa0;mm/min). Moreover, the laser-remelted layers prepared at 200&#xa0;mm/min and 400&#xa0;mm/min exhibit great corrosion resistance in the solution of 3.5% NaCl that is equivalent to 304 stainless steel.</p>

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Microstructures and Properties of Laser-Remelted CoCrCu0.1FeMoNi High-Entropy Alloy

  • 期刊论文

  • 发表日期：

    2025年2月14日

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  • Ning Liu,
  • Xin Zhang,
  • Haoyu Zhang,
  • Yuyang Qian,
  • Yanxin Qiao,
  • Jing Zhang,
  • Yan Zhang

摘要

In this work, CoCrCu0.1FeMoNi high-entropy alloy was prepared by electromagnetic induction melting and followed by laser remelting to investigate the effect of different metallurgical processes on microstructures and properties. Many bulk dendrites and eutectic structures were observed in the microstructures of induction-melted CoCrCu0.1FeMoNi high-entropy alloy. Ultrafine microstructures were obtained in the laser-remelted layer for the reason of rapid solidification. Various microstructures were obtained, and the formation mechanism was discussed in detail. Both as-cast and laser-remelted CoCrCu0.1FeMoNi high-entropy alloys show component phases of FCC, BCC, σ and μ. However, the volume fraction of FCC decreased while the volume fraction of BCC increased with the increasing scanning speed from 200 to 800 mm/min at a laser power of 240 W. Additionally, the laser-remelted layers were dramatically strengthened, and excellent wear resistance was achieved. The as-cast CoCrCu0.1FeMoNi high-entropy alloy showed severe adhesion, abrasion and oxidation wear, and mild adhesion and oxidation wear can be observed on the friction surface of the laser-remelted layers. Accordingly, the wear rates of CoCrCu0.1FeMoNi high-entropy alloy decrease from 1.34 × 10−7 mm3/N m (as-cast) to 0.65 × 10−7 mm3/N m (laser melted at 800 mm/min). Moreover, the laser-remelted layers prepared at 200 mm/min and 400 mm/min exhibit great corrosion resistance in the solution of 3.5% NaCl that is equivalent to 304 stainless steel.