Anisotropic slip activation via homogeneous dislocation nucleation in ZrB2 ceramic grains during nanoindentation

被引：17

作者：

Csanadi, Tamas ^{[1
]}

Naughton-Duszova, Annamaria ^{[2
]}

Dusza, Jan ^{[1
,3
]}

机构：

[1] Slovak Acad Sci, Inst Mat Res, Watsonova 47, Kosice 04353, Slovakia

[2] Inst Adv Mfg Technol, Ctr Mat Res & Sintering Technol, Wroclawska 37a, PL-30011 Krakow, Poland

[3] Obuda Univ, Donat Banki Fac Mech & Safety Engn, Nepszinhaz Utca 8, H-1081 Budapest, Hungary

来源：

SCRIPTA MATERIALIA | 2018年 / 152卷

关键词：

Dislocation nucleation; Nanoindentation pop-in; Critical resolved shear stress; Orientation dependence; ZrB2; SINGLE-CRYSTALS; PLASTIC-DEFORMATION; ZIRCONIUM; DIBORIDES; STRENGTH; BEHAVIOR; WHISKERS;

D O I：

10.1016/j.scriptamat.2018.04.025

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Anisotropic dislocation nucleation of differently oriented zirconium diboride (ZrB2) grains in a polycrystalline ZrB2-based ceramic composite was investigated during nanoindentation with a Berkovich tip. Based on the Hertzian stress analysis of the measured strain bursts, the critical resolved shear stresses for slip systems of {10 (1) over bar0}(11 (2) over bar0), {10 (1) over bar0}[0001] and {10 (1) over bar0}(11 (2) over bar3) types were determined. Homogeneous dislocation nucleation was revealed with near theoretical critical resolved shear stress (similar to 35 GPa) for each slip system. The analysis of the orientation dependence of the calculated maximal resolved shear stress values inferred anisotropic dislocation nucleation in ZrB2 grains with single and simultaneous activation of the investigated slip systems. (C) 2018 Acta Materialia Inc Published by Elsevier Ltd. All rights reserved.

引用

页码：89 / 93

页数：5

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