Nanoscale to microscale reversal in room-temperature plasticity in SrTiO3 by tuning defect concentration

被引：35
作者：
Fang, Xufei [1 ]
Ding, Kuan [1 ]
Janocha, Stephan [1 ]
Minnert, Christian [1 ]
Rheinheimer, Wolfgang [1 ]
Froemling, Till [1 ]
Durst, Karsten [1 ]
Nakamura, Atsutomo [2 ,3 ]
Roedel, Jurgen [1 ]
机构：
[1] Tech Univ Darmstadt, Dept Mat & Earth Sci, D-64287 Darmstadt, Germany
[2] Nagoya Univ, Dept Mat Phys, Chikusa Ku, Furo Cho, Nagoya, Aichi 4648603, Japan
[3] Japan Sci & Technol Agcy JST, PRESTO, Chiyoda Ku, 7 Gobancho, Tokyo 1020076, Japan
来源：
SCRIPTA MATERIALIA | 2020年 / 188卷
关键词：
Defects; Room-temperature plasticity; Dislocation nucleation and motion; Nanoindentation; SrTiO3; DISLOCATION PILE-UPS; STRONTIUM-TITANATE; SINGLE-CRYSTALS; NANOINDENTATION; DEFORMATION; DIFFUSION; COMPRESSION; MECHANISMS; NUCLEATION; ZIRCONIA;
D O I：
10.1016/j.scriptamat.2020.07.033
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Incipient room-temperature plastic deformation in single-crystal SrTiO3 at the nanoscale and the microscale is contrasted by applying a scale-dependent indentation technique. Using nanoindentation popin, nanoindentation creep, and an evaluation of dislocation spacing via etch pit study, we demonstrate a reversal of yield stress for crystals with different vacancy concentrations and pre-existing dislocation densities. A competing mechanism between dislocation nucleation and dislocation motion on crystal plasticity at different length scales is highlighted. This finding enables us to complete the understanding of dislocation-mediated plasticity for ceramic oxides at the nanoscale as compared to the microscale and macroscale. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：228 / 232
页数：5
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