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説明:

The temperature dependence of the flexural strength of sintered boron carbide was studied. At temperatures above 2000 °C, B4C showed an ultrahigh flexural strength exceeding 1 GPa which was accompanied by a change in the deformation mechanism from brittle fracture to plastic deformation. Scanning transmission electron microscopy (STEM) observations revealed that the amorphization can be of microstructural origin for the observed plasticity in B4C at temperatures above 2000 °C and a strain rate of 3•10−3 s−1. The amorphization occurs inside of the severely deformed grains. Flexural tests below 2000 °C provided evidence for the formation of stacking faults or dislocations, which are ordinary defects after the flexural tests. The results at 2000 °C suggest that the magnitude of the tensile stresses imposed on the B4C grains during deformation in flexure and the total strain transferred to a ceramic during the deformation process play the dominant role in the crystalline-amorphous transformation.

権利情報:

• In Copyright
  

キーワード: Boron carbide, Transmission electron microscopy (TEM), Crystal defects, High-temperature deformation

刊行年月日: 2022-01-04

出版者: Elsevier BV

掲載誌:

• Scripta Materialia (ISSN: 13596462) vol. 210 114487

研究助成金:

• NIMS PA5180 (セラミックスプロセッシング)

原稿種別: 著者最終稿 (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.4972

公開URL: https://doi.org/10.1016/j.scriptamat.2021.114487

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更新時刻: 2024-11-21 16:32:10 +0900

MDRでの公開時刻: 2024-11-21 16:32:10 +0900