期刊
ACTA MATERIALIA
卷 88, 期 -, 页码 252-259出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2015.01.043
关键词
Ceramics; Micropillar; Plastic deformation; Size effect; Transmission electron microscopy
资金
- World Premier International (WPI) Center Initiative for Atoms, Molecules and Materials, MEXT, Japan
- U.S. Army International Technology Center Pacific (ITC-PAC) of Tokyo
- U. S. Army Research Lab through Johns Hopkins University
Ceramics are known to be mechanically hard, chemically inert and electrically insulating for many important applications. However, they usually suffer from brittleness and have moderate strength that strongly depends on their microscopic structure. In this study, we report a size induced brittle-to-ductile transition in single-crystal aluminum nitride (MN). When the specimen diameters are smaller than similar to 3-4 mu m, AlN micropillars show metal-like plastic flow under room-temperature uniaxial compression. The unprecedented plastic strain of similar to 5-10% together with the ultrahigh strength of similar to 6.7 GPa has never been achieved before. Transmission electron microscopy demonstrates that dislocations play a dominant role in the plasticity of the micro-sized AlN. (c) 2015 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据