TY - JOUR
T1 - Hf 含量对 CoCrFeNiHfx共晶高熵合金显微组织与摩擦性能的影响
AU - Ai, Cheng
AU - Zhao, Xin Bo
AU - Chen, Xi
AU - Guo, Min
AU - Huang, Tai Wen
AU - Liu, Lin
N1 - Publisher Copyright:
© 2023 Central South University of Technology. All rights reserved.
PY - 2023/9
Y1 - 2023/9
N2 - A series of CoCrFeNiHfx (x=0.3, 0.43 and 0.5) eutectic high entropy alloys with different Hf contents were designed, and the effects of Hf content on the microstructure, microhardness and tribological properties of CoCrFeNiHfx eutectic high entropy alloys were investigated. With the increase of Hf content, the as-cast microstructures change from hypoeutectic (primary γ phase+ γ/Laves eutectic phases, x=0.3) to eutectic (γ/Laves eutectic phases, x=0.43) and hypereutectic (primary Laves phase+ γ/Laves eutectic phases, x=0.5). With the increase of Hf content, the microhardness of alloy increases and the friction coefficient remained almost does not change. The results of nanoindentation show that the hardness of both primary phase and eutectic phases in experimental alloys increase with the increase of Hf content. Meanwhile, the wear depth firstly decreases and then increases, and the wear mechanism changes from adhesive wear to abrasive wear. CoCrFeNiHf0.43 alloy shows the best wear resistance, which is caused by lamellar eutectic phases underwent synergistic deformation during wear process, and thus CoCrFeNiHf0.43 alloy is not prone to occur brittle spalling during wear.
AB - A series of CoCrFeNiHfx (x=0.3, 0.43 and 0.5) eutectic high entropy alloys with different Hf contents were designed, and the effects of Hf content on the microstructure, microhardness and tribological properties of CoCrFeNiHfx eutectic high entropy alloys were investigated. With the increase of Hf content, the as-cast microstructures change from hypoeutectic (primary γ phase+ γ/Laves eutectic phases, x=0.3) to eutectic (γ/Laves eutectic phases, x=0.43) and hypereutectic (primary Laves phase+ γ/Laves eutectic phases, x=0.5). With the increase of Hf content, the microhardness of alloy increases and the friction coefficient remained almost does not change. The results of nanoindentation show that the hardness of both primary phase and eutectic phases in experimental alloys increase with the increase of Hf content. Meanwhile, the wear depth firstly decreases and then increases, and the wear mechanism changes from adhesive wear to abrasive wear. CoCrFeNiHf0.43 alloy shows the best wear resistance, which is caused by lamellar eutectic phases underwent synergistic deformation during wear process, and thus CoCrFeNiHf0.43 alloy is not prone to occur brittle spalling during wear.
KW - CoCrFeNiHf eutectic high entropy alloy
KW - microhardness
KW - microstructure
KW - nanoindentation
KW - tribological properties
UR - http://www.scopus.com/inward/record.url?scp=85179179985&partnerID=8YFLogxK
U2 - 10.11817/j.ysxb.1004.0609.2022-43548
DO - 10.11817/j.ysxb.1004.0609.2022-43548
M3 - 文章
AN - SCOPUS:85179179985
SN - 1004-0609
VL - 33
SP - 2850
EP - 2860
JO - Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals
JF - Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals
IS - 9
ER -