High strain gradient induced nanograin in a CoCrNiVC medium entropy alloy with lamellar carbide

Pan，S.1,2; Zhang，J. Q.1; He，B. B.1; Huang，M. X.2

2022-09-05

10.1016/j.msea.2022.143692

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING   Impact Factor & Quartile

0921-5093

1873-4936

The present work investigates the interaction of the matrix and lamellar CrC carbide in a CoCrNiVC medium entropy alloy (MEA) during the plastic deformation. The homogenized sample was annealed to facilitate the precipitation of the carbide. The lamellar carbide only precipitated near the incoherent twin boundaries. Nanoindentation technique was used to introduce the plastic deformation in a local region near the incoherent twin boundaries. Interestingly, a new nano-grain was formed in the region containing carbide during the test. The lamellar carbide confined the propagation of the plastic strain, leading to a high strain gradient at the region between two lamellar carbides, which is substantiated by finite element simulation. Such a high strain gradient is responsible for the formation of nano-grain boundary in the present MEA with the lamellar carbide during nanoindentation.

Lamellar carbide Medium entropy alloy Nano-grain Nanoindentation

EI ; SCI

English

First ; Corresponding

National Key Research and Development Program of China[2019YFA0209900];National Natural Science Foundation of China[52130102];National Natural Science Foundation of China[U52071173];

Science & Technology - Other Topics ; Materials Science ; Metallurgy & Metallurgical Engineering

Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering

WOS:000932073800002

ELSEVIER SCIENCE SA

20223212545026

Carbides ; Chromium alloys ; Cobalt alloys ; Grain boundaries ; High-entropy alloys ; Nanoindentation ; Plastic deformation

Metallurgy and Metallography:531 ; Chromium and Alloys:543.1 ; Iron Alloys:545.2 ; Nonferrous Metals and Alloys excluding Alkali and Alkaline Earth Metals:549.3 ; Thermodynamics:641.1 ; Nanotechnology:761 ; Inorganic Compounds:804.2 ; Ceramics:812.1 ; Mechanical Variables Measurements:943.2

MATERIALS SCIENCE

2-s2.0-85135410724

Scopus

1.Department of Mechanical and Energy Engineering,Southern University of Science and Technology,Shenzhen,518055,China
2.Department of Mechanical Engineering,The University of Hong Kong,Hong Kong,China

Pan，S.,Zhang，J. Q.,He，B. B.,et al. High strain gradient induced nanograin in a CoCrNiVC medium entropy alloy with lamellar carbide[J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,2022,852.

Pan，S.,Zhang，J. Q.,He，B. B.,&Huang，M. X..(2022).High strain gradient induced nanograin in a CoCrNiVC medium entropy alloy with lamellar carbide.MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,852.

Pan，S.,et al."High strain gradient induced nanograin in a CoCrNiVC medium entropy alloy with lamellar carbide".MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 852(2022).