Influence of loading rate on nanohardness of sapphire

被引：36

作者：

Bhattacharya, Manjima ^{[1
]}

Dey, Arjun ^{[2
]}

Mukhopadhyay, Anoop Kumar ^{[1
]}

机构：

[1] Cent Glass & Ceram Res Inst, CSIR, Adv Mech & Mat Characterizat Div, Kolkata 700032, India

[2] ISRO Satellite Ctr, Thermal Syst Grp, Vimanapura Post, Bangalore 560017, Karnataka, India

来源：

CERAMICS INTERNATIONAL | 2016年 / 42卷 / 12期

关键词：

Nanohardness; Loading rate; Pop-in; Nanoscale plasticity; Shear stress; Sapphire; CONTACT-INDUCED PLASTICITY; LIME-SILICA GLASS; MECHANICAL-PROPERTIES; SINGLE-CRYSTAL; POP-IN; DEFORMATION-BEHAVIOR; NUMERICAL-SIMULATION; INITIAL-STAGES; NANOINDENTATION; INDENTATION;

D O I：

10.1016/j.ceramint.2016.05.091

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

This work reports the loading rate effect on nanohardness of sapphire. The intrinsic nanoscale contact deformation resistance of sapphire increased with the loading rates following empirical power law dependence with a positive exponent. The results showed a significant enhancement (e.g., similar to 66%) of the nanohardness of sapphire with the increase in loading rates from 10 to 10,000 mu N s(-1). These results were explained mainly in terms of the maximum shear stress generated underneath the nanoindenter, dislocation density and critical resolved shear stress of the sapphire. (C) 2016 Elsevier Ltd and Techna Group S.r.l. All rights reserved.

引用

页码：13378 / 13386

页数：9

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