Microstructure evolution and deformation mechanism of coherent L12-strengthened high-entropy alloy during sliding wear

Yang，Lu1; Wei，Chengxia1; Liang，Dingshan1; Jiang，Feilong1; Cheng，Zhuo1; Luan，Junhua2; Jiao，Zengbao3; Ren，Fuzeng1

2023-05-01

10.1016/j.compositesb.2023.110651

COMPOSITES PART B-ENGINEERING   影响因子和分区

1359-8368

1879-1069

Face-centered-cubic high-entropy alloys (HEAs) strengthened with coherent ordered nanoprecipitates have demonstrated excellent strength-ductility synergy, even at elevated temperature. However, there still lacks fundamental understanding on their microstructure evolution and deformation mechanisms during dry sliding wear. Herein, we systematically investigated the friction and wear behaviors of CoCrNi(AlNb) alloy with high-density coherent L1 nanoprecipitates during sliding at room and elevated temperatures, with particular focus on wear-induced microstructure evolution. The alloy shows a low wear rate of 1.80 × 10 mm/(N⋅m) at room temperature (RT) and even an ultralow wear rate of the order of 10 mm/(N⋅m) at 600 °C. Detailed TEM analyses reveal that sliding-induced stacking faults (SFs) and dislocation cells play important roles in the formation of the gradient microstructure at RT and 600 °C, respectively. The superior wear resistance at RT is mainly attributed to the precipitation strengthening of high-density coherent L1 phase and the dynamic work-hardening of SF networks near the sliding surface. However, at 600 °C, the reduced wear rates and coefficients of friction are associated with the formation of glaze layer and the high resistance to thermal softening. This work provides significant insight into the sliding-induced microstructure evolution and deformation mechanism of L1-strengthened high-entropy alloys during sliding wear.

Deformation mechanism High-entropy alloy Microstructure evolution Sliding wear

SCI ; EI

英语

第一 ; 通讯

National Natural Science Foundation of China[52122102] ; Basic and Applied Basic Research Foundation of Guangdong province[2022B1515120082] ; Shenzhen Basic Research Program, china[JCYJ20220530113017040] ; Inter-University 3D APT Unit of City University of Hong Kong (CityU) - CityU[9360161]

Engineering ; Materials Science

Engineering, Multidisciplinary ; Materials Science, Composites

WOS:001029924200001

ELSEVIER SCI LTD

20231013682149

Aluminum alloys ; Chromium alloys ; Cobalt alloys ; Entropy ; Friction ; Microstructure ; Niobium alloys ; Precipitation (chemical) ; Room temperature ; Strain hardening ; Ternary alloys ; Titanium alloys ; Wear of materials ; Wear resistance

Metallurgy and Metallography:531 ; Heat Treatment Processes:537.1 ; Aluminum Alloys:541.2 ; Titanium and Alloys:542.3 ; Chromium and Alloys:543.1 ; Iron Alloys:545.2 ; Nonferrous Metals and Alloys excluding Alkali and Alkaline Earth Metals:549.3 ; Thermodynamics:641.1 ; Chemical Operations:802.3 ; Physical Properties of Gases, Liquids and Solids:931.2 ; Materials Science:951

MATERIALS SCIENCE

2-s2.0-85149401702

Scopus

1.Department of Materials Science and Engineering,Southern University of Science and Technology,Shenzhen,Guangdong,China
2.Department of Materials Science and Engineering,City University of Hong Kong,Hong Kong,China
3.Department of Mechanical Engineering,The Hong Kong Polytechnic University,Hong Kong,China

Yang，Lu,Wei，Chengxia,Liang，Dingshan,et al. Microstructure evolution and deformation mechanism of coherent L12-strengthened high-entropy alloy during sliding wear[J]. COMPOSITES PART B-ENGINEERING,2023,256.

Yang，Lu.,Wei，Chengxia.,Liang，Dingshan.,Jiang，Feilong.,Cheng，Zhuo.,...&Ren，Fuzeng.(2023).Microstructure evolution and deformation mechanism of coherent L12-strengthened high-entropy alloy during sliding wear.COMPOSITES PART B-ENGINEERING,256.

Yang，Lu,et al."Microstructure evolution and deformation mechanism of coherent L12-strengthened high-entropy alloy during sliding wear".COMPOSITES PART B-ENGINEERING 256(2023).