Modes of strain accommodation in Cu-Nb multilayered thin film on indentation and cyclic shear

被引：3

作者：

Pole, Mayur ^{[1
]}

Lu, Zexi ^{[1
]}

Ajantiwalay, Tanvi Anil ^{[3
]}

Olszta, Matthew ^{[3
]}

Tripathi, Shalini ^{[3
]}

Yu, Anqi ^{[1
]}

Mehta, Hardeep ^{[1
]}

Wang, Tianhao ^{[3
]}

Ma, Xiaolong ^{[3
]}

Devaraj, Arun ^{[1
]}

Gwalani, Bharat ^{[1
,2
]}

机构：

[1] Pacific Northwest Natl Lab, Phys & Computat Sci Directorate, Richland, WA 99352 USA

[2] North Carolina State Univ, Dept Mat Sci & Engn, Raleigh, NC 27695 USA

[3] Pacific Northwest Natl Lab, Energy & Environm Directorate, Richland, WA 99352 USA

来源：

SURFACES AND INTERFACES | 2023年 / 37卷

关键词：

Cu-Nb layered thin films; Coefficient of friction; Cyclic shear; Deformation mechanism; Detwinning; GROWTH TWINS; DEFORMATION; INTERFACES; MECHANISMS; CU/NB; STABILITY; STRENGTH; BEHAVIOR;

D O I：

10.1016/j.surfin.2023.102712

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Two-phase layered thin films with a high density of semi-coherent interfaces exhibit excellent mechanical properties and thermal stability. In this study, a magnetron-sputtered Cu-Nb dual-layered thin film (-500 nm for Cu and-150 nm for Nb) having an amorphous interface between Cu and Nb with a high density of aligned growth twins in Cu is subjected to severe surface deformation. The material is loaded using indentation and cyclic shear under tribological testing. The strain accommodation in the subsurface microstructure after defor-mation varies based on the local structure and deformation mode. Grain refinement and crack formations in the stressed region of the Nb layer and localized crystallization of the amorphous interface are observed after indentation and scratch testing. Pronounced detwinning of growth twins in the Cu layer under the cyclic shear strain leaves large dislocations sites and loops which are observed both by high-resolution transmission electron microscopy and experiment-guided molecular dynamic (MD) simulations. Our simulations provided insights into understanding the pathway for the detwinning process under cyclic shear loading.

引用

页数：7

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