Effect of Strain Rate on Nano-Scale Mechanical Behavior of A-Plane (112¯0) ZnO Single Crystal by Nanoindentation

Author:

Zhu Xiaolin123,Li Jijun12,Zhang Lihua4,Lang Fengchao1,Hou Xiaohu5,Zhao Xueping5,Zhang Weiguang1,Zhao Chunwang6,Yang Zijian1

Affiliation:

1. College of Science, Inner Mongolia University of Technology, Hohhot 010051, China

2. School of Mechanical and Energy Engineering, Shanghai Technical Institute of Electronics & Information, Shanghai 201411, China

3. College of Science and Technology, Inner Mongolia Open University, Hohhot 010011, China

4. College of Arts and Sciences, Shanghai Maritime University, Shanghai 201306, China

5. Test Center, Inner Mongolia University of Technology, Hohhot 010051, China

6. School of Materials Science and Hydrogen Energy, Foshan University, Foshan 528000, China

Abstract

In this study, nanoindentation tests at three different strain rates within 100 nm indentation depth were conducted on an a-plane (112¯0) ZnO single crystal to investigate the effect of strain rate on its nano-scale mechanical behavior. The load–indentation-depth curves, pop-in events, hardness and Young’s moduli of an a-plane (112¯0) ZnO single crystal at different strain rates were investigated at the nano-scale level. The results indicated that, with the indentation depth increasing, the load increased gradually at each maximum indentation depth, hma, during the loading process. A distinct pop-in event occurred on each loading curve except that corresponding to the hmax of 10 nm. The applied load at the same indentation depth increased with the increasing strain rate during the nanoindentation of the a-plane (112¯0) ZnO single crystal. The higher strain rate deferred the pop-in event to a higher load and deeper indentation depth, and made the pop-in extension width larger. The hardness showed reverse indentation size effect (ISE) before the pop-in, and exhibited normal ISE after the pop-in. Both the hardness and the Young’s modulus of the a-plane (112¯0) ZnO single crystal increased with the increasing strain rate, exhibiting the positive strain-rate sensitivity.

Funder

Natural Science Foundation of Inner Mongolia Autonomous Region

National Natural Science Foundation of China

College Science Research Project of Inner Mongolia Autonomous Region

Basic Scientific Research Expenses Program of Universities directly under Inner Mongolia Autonomous Region

Publisher

MDPI AG

Subject

Electrical and Electronic Engineering,Mechanical Engineering,Control and Systems Engineering

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