Unravelling mechanisms for the formation of amorphous bands in B6O under nonhydrostatic pressure

Han，Yunxia1,2; Gu，Chao2; Chen，Jian2; Zhou，Xuefeng2; Ma，Dejiang2; Cheng，Hu2; Zhao，Yusheng2; He，Duanwei1; Wang，Shanmin2

2022-03-01

10.1016/j.scriptamat.2021.114376

SCRIPTA MATERIALIA   影响因子和分区

1359-6462

1872-8456

Boron suboxide (B6O) with superhardness holds great promise for a wide range of practical applications, but suffers from a low fracture toughness due to the formation of unusual nanoscale amorphous bands. Understanding of the underlying deformation mechanisms in this material, however, has been hindered limited experimental evidences. Here we report the discovery of new mechanisms for the formation of amorphous bands in B6O under nonhydrostatic pressure, based on in-situ high-pressure optical absorption measurements and analysis of postmortem samples. We find that the bandgap of B6O is sensitive to plastic deformation, offering an effective approach for exploring deformation behaviors of this material. Two new amorphous bands are identified along two distinct crystallographic planes of (1 (1) over bar0 (4) over bar) and (4 (3) over bar(1) over bar(8) over bar) associated with unbonded O-O pairs. Our findings establish a methodology for in-situ probe of plastic deformation in brittle materials, and demonstrate how their properties can be altered by plastic deformations under nonhydrostatic pressures. (C) 2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Boron suboxides Nonhydrostatic pressure Bandgap Amorphous band Plastic deformation

SCI ; EI

英语

通讯

National Key R&D Program of China[2018YFA0305900] ; National Natural Science Foundation of China[51472171,11427810] ; Key Research Platforms and Research Projects of Universities in Guangdong Province[2018KZDXM062] ; Guangdong Innovative & Entrepreneurial Research Team Program[2016ZT06C279] ; Shenzhen Peacock Plan[KQTD2016053019134356]

Science & Technology - Other Topics ; Materials Science ; Metallurgy & Metallurgical Engineering

Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering

WOS:000721513100011

PERGAMON-ELSEVIER SCIENCE LTD

20214611160752

Fracture toughness ; High pressure engineering ; Light absorption ; Plastic deformation

Light/Optics:741.1

MATERIALS SCIENCE

2-s2.0-85118955181

Web of Science

1.Institute of Atomic and Molecular Physics,Sichuan University,Chengdu,610065,China
2.Department of Physics & SUSTech Academy for Advanced Interdisciplinary Studies,Southern University of Science and Technology,Shenzhen,518055,China

Han，Yunxia,Gu，Chao,Chen，Jian,et al. Unravelling mechanisms for the formation of amorphous bands in B6O under nonhydrostatic pressure[J]. SCRIPTA MATERIALIA,2022,209.

Han，Yunxia.,Gu，Chao.,Chen，Jian.,Zhou，Xuefeng.,Ma，Dejiang.,...&Wang，Shanmin.(2022).Unravelling mechanisms for the formation of amorphous bands in B6O under nonhydrostatic pressure.SCRIPTA MATERIALIA,209.

Han，Yunxia,et al."Unravelling mechanisms for the formation of amorphous bands in B6O under nonhydrostatic pressure".SCRIPTA MATERIALIA 209(2022).