Ultra-high temperature flexure and strain driven amorphization in polycrystalline boron carbide bulks

D. Demirskyi; H. Sepehri-Amin; T. S. Suzuki; K. Yoshimi; O. Vasylkiv

doi:10.1016/j.scriptamat.2021.114487

Ultra-high temperature flexure and strain driven amorphization in polycrystalline boron carbide bulks

D. Demirskyi^*, H. Sepehri-Amin, T. S. Suzuki, K. Yoshimi, O. Vasylkiv

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

1 Citation (Scopus)

Abstract

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.

Original language	English
Article number	114487
Journal	Scripta Materialia
Volume	210
DOIs	https://doi.org/10.1016/j.scriptamat.2021.114487
Publication status	Published - 2022 Mar 15
Externally published	Yes

Keywords

Boron carbide
Crystal defects
High-temperature deformation
Transmission electron microscopy (TEM)

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering
Metals and Alloys

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10.1016/j.scriptamat.2021.114487

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@article{e07337c523374d5c998cbaceda621bcd,

title = "Ultra-high temperature flexure and strain driven amorphization in polycrystalline boron carbide bulks",

abstract = "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.",

keywords = "Boron carbide, Crystal defects, High-temperature deformation, Transmission electron microscopy (TEM)",

author = "D. Demirskyi and H. Sepehri-Amin and Suzuki, {T. S.} and K. Yoshimi and O. Vasylkiv",

note = "Publisher Copyright: {\textcopyright} 2021 Acta Materialia Inc.",

year = "2022",

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day = "15",

doi = "10.1016/j.scriptamat.2021.114487",

language = "English",

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T1 - Ultra-high temperature flexure and strain driven amorphization in polycrystalline boron carbide bulks

AU - Demirskyi, D.

AU - Sepehri-Amin, H.

AU - Suzuki, T. S.

AU - Yoshimi, K.

AU - Vasylkiv, O.

PY - 2022/3/15

Y1 - 2022/3/15

N2 - 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.

AB - 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.

KW - Boron carbide

KW - Crystal defects

KW - High-temperature deformation

KW - Transmission electron microscopy (TEM)

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DO - 10.1016/j.scriptamat.2021.114487

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SN - 1359-6462

VL - 210

JO - Scripta Materialia

JF - Scripta Materialia

M1 - 114487

ER -

Ultra-high temperature flexure and strain driven amorphization in polycrystalline boron carbide bulks

Abstract

Keywords

ASJC Scopus subject areas

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