Sliding wear of CoCrNi medium-entropy alloy at elevated temperatures: Wear mechanism transition and subsurface microstructure evolution

Pan，Shuai1,2; Zhao，Cancan1; Wei，Pengbo1,3; Ren，Fuzeng1

2019-12-15

10.1016/j.wear.2019.203108

WEAR   影响因子和分区

0043-1648

1873-2577

To gain a comprehensive understanding of the wear mechanism and the combined effect of low stacking fault energy (SFE) and external elevated temperature on sliding-induced plastic deformation of CoCrNi medium-entropy alloy (MEA), herein, we report on the wear response of fine-grained CoCrNi MEA against Inconel alloy 718 counterparts between room temperature (RT) and 300 °C, with particular focus on the wear mechanism transition and sliding-induced subsurface microstructure evolution. The results show that the hardness of the MEA and coefficients of friction (CoFs) start to decrease at 200 °C, but wear rates monotonously decrease with rising temperatures. The wear mode changes from abrasive wear at RT to oxidative and adhesive wear at 200 °C. Between RT and 150 °C, stacking faults and deformation twins play a significant role in the formation of gradient subsurface microstructure. The improved wear resistance is mainly attributed to the thermal softening of the mating material and the increased contribution of adhesive wear. However, at 200 °C and above, the reduced wear rates and CoFs are associated with the formation of glaze layer. The present findings provide insights into understanding the wear mechanism and sliding-induced deformation of metallic alloys with low SFE at elevated temperatures.

CoCrNi Medium-entropy alloy Subsurface microstructure Wear mechanism

EI ; SCI

英语

第一 ; 通讯

Development and Reform Commission of Shenzhen Municipality[] ; Shenzhen Fundamental Research and Discipline Layout project[]

Engineering ; Materials Science

Engineering, Mechanical ; Materials Science, Multidisciplinary

WOS:000503462500031

Elsevier Ltd

20194507648714

Adhesives ; Chromium alloys ; Cobalt alloys ; Entropy ; Friction ; Microstructure ; More electric aircraft ; Stacking faults ; Ternary alloys ; Tribology ; Twinning ; Wear of materials

Chromium and Alloys:543.1 ; Nonferrous Metals and Alloys excluding Alkali and Alkaline Earth Metals:549.3 ; Thermodynamics:641.1 ; Classical Physics; Quantum Theory; Relativity:931 ; Physical Properties of Gases, Liquids and Solids:931.2 ; Crystal Lattice:933.1.1 ; Crystal Growth:933.1.2 ; Materials Science:951

MATERIALS SCIENCE

2-s2.0-85074599287

Scopus

1.Department of Materials Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China
2.Department of Materials Science and Engineering,Harbin Institute of Technology,Harbin,150001,China
3.Department of Mechanical and Aerospace Engineering,The Hong Kong University of Science and Technology,Kowloon,Clear Water Bay,Hong Kong

Pan，Shuai,Zhao，Cancan,Wei，Pengbo,et al. Sliding wear of CoCrNi medium-entropy alloy at elevated temperatures: Wear mechanism transition and subsurface microstructure evolution[J]. WEAR,2019,440-441.

Pan，Shuai,Zhao，Cancan,Wei，Pengbo,&Ren，Fuzeng.(2019).Sliding wear of CoCrNi medium-entropy alloy at elevated temperatures: Wear mechanism transition and subsurface microstructure evolution.WEAR,440-441.

Pan，Shuai,et al."Sliding wear of CoCrNi medium-entropy alloy at elevated temperatures: Wear mechanism transition and subsurface microstructure evolution".WEAR 440-441(2019).