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A Hf-doped dual-phase high-entropy alloy: phase evolution and wear features

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Abstract

Initially defined high entropy alloys (HEAs) usually exhibit a single-phase solid-solution structure. However, two and/or more types of phases in HEAs possibly induce the desired microstructure features, which contribute to improving the wear properties of HEAs. Here, we prepare a series of (AlCoCrFeNi)100−xHfx (x = 0, 2, 4 and 6; at%) HEAs and concern their phase compositions, microstructures and wear properties. Hf leads to the formation of (Ni, Co)2Hf-type Laves phase and tailors the microstructure from a body-centered cubic (BCC) single-phase structure to a hypoeutectic structure. An increased hardness from ~ HV 512.3 to ~ HV 734.1 is due to solid-solution strengthening, grain refinement strengthening and precipitated phase strengthening. And a few oxides (Al2O3 + Cr2O3) caused by the wear heating contribute to an 85.5% decrease in wear rate of the HEA system from 6.71 × 10−5 to 0.97 × 10−5 m3·N−1·m−1. In addition, Hf addition changes the wear mechanism from abrasive wear, mild oxidative wear and adhesive wear to oxidative wear and adhesive wear.

摘要

最初定义的高熵合金(HEAs) 通常表现出单相固溶体结构。然而, 高熵合金中两种和/或多种类型的相可能会产生所需的微观结构特征, 这有助于改善高熵合金的摩擦性能。在这里, 我们制备了一系列(AlCoCrFrNi)100-xHfx(x = 0, 2, 4和6; at%) 高熵合金, 并研究了它们的相组成、微观结构和摩擦性能。Hf元素导致(Ni, Co)2Hf型Laves相的形成, 并将微观结构从体心立方 (BCC) 单相结构调整为亚共晶结构。硬度从 ~ HV512.3增加到 ~ HV734.1是固溶强化、晶粒细化强化和沉淀相强化造成的。磨损加热引起的少量氧化物 (Al2O3 + Cr2O3) 使高熵合金的磨损率从6.71 × 10−5降低到0.97 × 10–5 m3·N−1·m−1。此外, Hf的加入使磨损机制从磨粒磨损、轻度氧化磨损和粘着磨损转变为氧化磨损和粘着磨损。

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (No. 51825401), the Postdoctoral Foundation of Heilongjiang Province (No. LBH-Z19154), the National Natural Science Foundation of Heilongjiang Province (No. LH2020E031) and the Interdisciplinary Research Foundation of HIT. The authors thanked Dr. J.X. Zhang, Harbin Institute of Technology, for helpful discussions and contributions.

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  1. National Key Laboratory for Precision Hot Processing of Metals, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, 150001, China

    Hao Ren, Rui-Run Chen, Xue-Feng Gao, Tong Liu, Gang Qin, Shi-Ping Wu & Jing-Jie Guo

  2. School of Metallurgy and Materials, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK

    Yu-Lung Chiu

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Ren, H., Chen, RR., Gao, XF. et al. A Hf-doped dual-phase high-entropy alloy: phase evolution and wear features. Rare Met. 43, 324–333 (2024). https://doi.org/10.1007/s12598-023-02410-0

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