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

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

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Initially defined high entropy alloys(HEAs)usually exhibit a single-phase solid-solution structure.However,two and/or more types of phases in HEAs pos-sibly 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 for-mation 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 strengthen-ing 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.

High entropy alloyLaves phaseHardnessWear mechanism

Hao Ren、Rui-Run Chen、Xue-Feng Gao、Tong Liu、Gang Qin、Yu-Lung Chiu、Shi-Ping Wu、Jing-Jie Guo

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

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

National Natural Science Foundation of ChinaPostdoctoral Foundation of Heilongjiang ProvinceNational Natural Science Foundation of Heilongjiang ProvinceInterdisciplinary Research Foundation of HIT

51825401LBH-Z19154LH2020E031

2024

10.1007/s12598-023-02410-0

稀有金属(英文版)
中国有色金属学会

稀有金属(英文版)

CSTPCDEI
影响因子：0.801
ISSN：1001-0521
年,卷(期)：2024.43(1)
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