Enhanced resistance to shear instability by gradient nanolayered structures in sputtered Cu/Zr composites

Qin，Feng1,2; Lu，Wenjun3; Li，Jianjun1,2

2022-06-27

10.1016/j.msea.2022.143253

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING   影响因子和分区

0921-5093

1873-4936

Nanolayered metallic composites have exhibited ultrahigh strength but compromised ductility due to their vulnerability to shear instability during deformation. Here we show that a gradient nanolayer design is effective in tuning the resistance to shear instability of the layered composites. The gradient design is realized by architecting a gradient distribution in the constituent layer thickness from the surface to the core. A combination of nano and micro-indentation tests and scanning transmission electron microscopy is employed to investigate the shear instability of the newly designed gradient nanolayered Cu/Zr composites. The nanoindentation tests show that the plastic pileup (sign of shear banding) is eliminated in the gradient nanolayered sample with more thin layers, while the microindentation tests show that less shear bands are formed by increasing the number of thin layers. Both tests demonstrated an enhanced resistance to shear instability by an appropriate gradient nanolayer design, which can be attributed to the improved strain delocalization capability and high dislocation density.

Gradient nanolayered structure Indentation Shear band Shear instability Thin film

SCI ; EI

英语

其他

National Natural Science Foundation of China[11872380];Natural Science Foundation of Hunan Province[2019JJ50750];Natural Science Foundation of Hunan Province[2020JJ3043];Hunan Provincial Science and Technology Department[2021RC3022];

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

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

WOS:000809744100003

ELSEVIER SCIENCE SA

20222112157935

High resolution transmission electron microscopy ; Metals ; Nanoindentation ; Scanning electron microscopy ; Stability

Optical Devices and Systems:741.3 ; Nanotechnology:761 ; Mechanical Variables Measurements:943.2

MATERIALS SCIENCE

2-s2.0-85130536682

Scopus

1.College of Mechanical and Electrical Engineering,Central South University,Changsha,Hunan,410083,China
2.State Key Laboratory of High Performance Complex Manufacturing,Central South University,Changsha,Hunan,410083,China
3.Department of Mechanical and Energy Engineering,Southern University of Science and Technology,Shenzhen,518055,China

Qin，Feng,Lu，Wenjun,Li，Jianjun. Enhanced resistance to shear instability by gradient nanolayered structures in sputtered Cu/Zr composites[J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,2022,846.

Qin，Feng,Lu，Wenjun,&Li，Jianjun.(2022).Enhanced resistance to shear instability by gradient nanolayered structures in sputtered Cu/Zr composites.MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,846.

Qin，Feng,et al."Enhanced resistance to shear instability by gradient nanolayered structures in sputtered Cu/Zr composites".MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 846(2022).