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Al含量对CoCrFeNi2基高熵合金的微观结构及摩擦性能的影响
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河北大学 质量技术监督学院,河北 保定 071002

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国家自然科学基金, 河北省自然科学基金, 河北省教育厅基金


Effect of Aluminum Content on Microstructure and Tribolo-gical Properties of CoCrFeNi2-Based High-Entropy Alloys
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School of Quality and Technical Supervision, Hebei University, Baoding 071002, China

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National Natural Science Foundation of China (52201177); Hebei Province Department of Education Fund (QN2024264); Natural Science Foundation of Hebei Province (E2022201010)

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    摘要:

    使用了4种机器学习算法来预测高熵合金(HEA)的固溶体相。为了提高模型的准确率,采用了K折交叉验证。结果表明,K近邻(KNN)算法可以有效地区分体心立方(bcc)相、面心立方(fcc)相和混合(fcc+bcc)相,准确率为93%。随后,制备了CoCrFeNi2Alxx=0、0.1、0.3和1.0)HEA,并采用X射线衍射仪和能量色散光谱仪对其进行了表征,其相由单一的fcc相转变为fcc+bcc相,这与机器学习相预测的结果一致。此外,还评估了Al含量对CoCrFeNi2Alxx=0、0.1、0.3和1.0)HEAs的微观结构及摩擦性能的影响。结果表明,随着Al含量的增加,纳米硬度和显微硬度分别增加了约45%和75%。弹性极限参数H/Er从0.0216增加到0.030,而抗塑性形变参数H3/Er2从0.0014增加到0.0045,这表明随着Al含量的增加,纳米硬度得到了改善。此外,随着Al含量的增加,磨损率降低了35%。本研究为设计节能和省时的HEA制备方法提供了新思路。

    Abstract:

    Four machine learning algorithms were used to predict the solid solution phases of high-entropy alloys (HEAs). To improve the model accuracy, the K-fold cross validation was adopted. Results show that the K-nearest neighbor algorithm can effectively distinguish body-centered cubic (bcc) phase, face-centered cubic (fcc) phase, and mixed (fcc+bcc) phase, and the accuracy rate is approximately 93%. Thereafter, CoCrFeNi2Alx (x=0, 0.1, 0.3, 1.0) HEAs were prepared and characterized by X-ray diffractometer and energy disperse spectrometer. It is found that their phases are transformed from fcc phase to fcc+bcc phase, which is consistent with the prediction results of machine learning. Furthermore, the influence of Al content on the microstructure and tribological properties of CoCrFeNi2Alx (x=0, 0.1, 0.3, 1.0) HEAs was evaluated. Results reveal that with the increase in Al content, the nanohardness and microhardness increase by approximately 45% and 75%, respectively. The elastic limit parameter H/Er increases from 0.0216 to 0.030, whereas the plastic deformation resistance parameter H3/Er2 increases from 0.0014 to 0.0045, which demonstrates an improvement in nanohardness with the increase in Al addition amount. In addition, the wear rate decreases by 35% with the increase in Al addition amount. This research provides a new idea with energy-saving and time-reduction characteristics to prepare HEAs.

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张梦迪,张改梅,罗崇玮,徐汉清.Al含量对CoCrFeNi2基高熵合金的微观结构及摩擦性能的影响[J].稀有金属材料与工程,2025,54(2):343~353.[Zhang Mengdi, Zhang Gaimei, Luo Chongwei, Xu Hanqing. Effect of Aluminum Content on Microstructure and Tribolo-gical Properties of CoCrFeNi2-Based High-Entropy Alloys[J]. Rare Metal Materials and Engineering,2025,54(2):343~353.]
DOI:10.12442/j. issn.1002-185X.20240625

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  • 收稿日期:2024-09-27
  • 最后修改日期:2024-11-15
  • 录用日期:2024-12-02
  • 在线发布日期: 2025-02-25
  • 出版日期: 2025-02-20