TY - JOUR
T1 - Study on self-lubricating properties of AlCoCrFeNi2.1 eutectic high entropy alloy with electrochemical boronizing
AU - Dong, Jianxin
AU - Wu, Hongxing
AU - Chen, Ying
AU - Zhang, Yongliang
AU - Wu, Yunjie
AU - Yin, Shaochong
AU - Du, Yin
AU - Hua, Ke
AU - Wang, Haifeng
N1 - Publisher Copyright:
© 2022 Elsevier B.V.
PY - 2022/3/15
Y1 - 2022/3/15
N2 - The boronizing treatment has been an effective way to strengthen and enhance the lubrication performance of alloys. However, the traditional power-pack boronizing method has been limited due to its time-consuming. Improving the boronizing efficiency is highly demanded for the strengthening and industry application of the high-entropy alloys (HEAs). In this study, the electrochemical boronizing strategy was applied to improve the surface hardness and self-lubrication performance of AlCoCrFeNi2.1 eutectic HEA (EHEA). The microstructure, phase formation and hardness of boronized alloys were studied. Results confirm the high efficiency of electrochemical boronizing to form a boronized layer with a thickness of about 35 μm in 30 min. The surface hardness of the boronized AlCoCrFeNi2.1 HEA reached to about 18 GPa due to the presence of NiB, FeB and Cr3B4 in the boronized layer. Tribological tests reveal that the self-lubrication property of AlCoCrFeNi2.1 HEA in water condition was significantly enhanced by the electrochemical boronizing treatment, e.g., the friction and wear reductions reach to about 25% and 80%, respectively. Lubrication mechanism investigation by X-ray photoelectron spectroscopy (XPS) analysis showed the formation of a H3BO3 tribofilm on the sliding surface during the friction process, which effectively reduce friction and wear. This study provided a novel and fast approach for surface hardening and self-lubrication enhancement of HEA systems using the electrochemical boronizing strategy.
AB - The boronizing treatment has been an effective way to strengthen and enhance the lubrication performance of alloys. However, the traditional power-pack boronizing method has been limited due to its time-consuming. Improving the boronizing efficiency is highly demanded for the strengthening and industry application of the high-entropy alloys (HEAs). In this study, the electrochemical boronizing strategy was applied to improve the surface hardness and self-lubrication performance of AlCoCrFeNi2.1 eutectic HEA (EHEA). The microstructure, phase formation and hardness of boronized alloys were studied. Results confirm the high efficiency of electrochemical boronizing to form a boronized layer with a thickness of about 35 μm in 30 min. The surface hardness of the boronized AlCoCrFeNi2.1 HEA reached to about 18 GPa due to the presence of NiB, FeB and Cr3B4 in the boronized layer. Tribological tests reveal that the self-lubrication property of AlCoCrFeNi2.1 HEA in water condition was significantly enhanced by the electrochemical boronizing treatment, e.g., the friction and wear reductions reach to about 25% and 80%, respectively. Lubrication mechanism investigation by X-ray photoelectron spectroscopy (XPS) analysis showed the formation of a H3BO3 tribofilm on the sliding surface during the friction process, which effectively reduce friction and wear. This study provided a novel and fast approach for surface hardening and self-lubrication enhancement of HEA systems using the electrochemical boronizing strategy.
KW - Electrochemical boronizing
KW - Eutectic high entropy alloy
KW - Self-lubricating
KW - Surface hardening
UR - http://www.scopus.com/inward/record.url?scp=85122682208&partnerID=8YFLogxK
U2 - 10.1016/j.surfcoat.2022.128082
DO - 10.1016/j.surfcoat.2022.128082
M3 - 文章
AN - SCOPUS:85122682208
SN - 0257-8972
VL - 433
JO - Surface and Coatings Technology
JF - Surface and Coatings Technology
M1 - 128082
ER -