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Download fileFormation of twins in AlON material and its effects on the Vickers hardness and fracture toughness
journal contribution
posted on 2019-07-10, 09:23 authored by Maomao Ding, Tun Wang, Benjamin Maerz, Stuart RobertsonStuart Robertson, Zehan Sun, Lingcong Fan, Ying Shi, Houzheng WuAluminum oxynitride (γ-AlON) powders were synchronously synthesized by carbothermal reduction-nitridation (CRN) and high-temperature solid state reaction (SSR) methods. Twin structures existing in γ-AlON powders and transparent AlON ceramics were investigated by systematically employing electron backscattered diffraction (EBSD) and transmission electron microscopy (TEM). It was found that the twin structures in synthetic powder and transparent ceramics exhibit quite different microstructural features; binary twin structures were widely observed in powders and ceramics, whereas the sandwich-like twin structure was produced only in transparent ceramics. High-resolution electron backscattered diffraction (HREBSD) was used to determine the residual elastic stress distributions in AlON powders and ceramics. Discrepancies in the magnitude and distribution of the residual stress between binary twins and sandwich-like twins were fully clarified. The formation of two kinds of twins in powders and ceramics was discussed in detail. The Vickers hardness and its corresponding indentation size effect (ISE) were studied in CRN-AlON and SSR-AlON ceramics. The effects of the twin structure on the Vickers hardness and fracture toughness were investigated simultaneously.
Funding
National Natural Science Foundation of China (NO. 61475097).
History
School
- Aeronautical, Automotive, Chemical and Materials Engineering
Department
- Materials
Published in
Ceramics InternationalVolume
45Issue
17, Part APages
21127 - 21135Citation
DING, M. ... et al, 2019. Formation of twins in AlON material and its effects on the Vickers hardness and fracture toughness. Ceramics International, 45 (17, Part A), pp.21127-21135.Publisher
ElsevierVersion
- AM (Accepted Manuscript)
Rights holder
© Elsevier Ltd and Techna Group S.r.l.Publisher statement
This paper was accepted for publication in the journal Ceramics International and the definitive published version is available at https://doi.org/10.1016/j.ceramint.2019.07.089.Acceptance date
2019-07-08Publication date
2019-07-09Copyright date
2019ISSN
0272-8842Publisher version
Language
- en