An inverse Hall-Petch relation in nanocrystalline MgAl2O4 spinel consolidated by high pressure spark plasma sintering (HPSPS)

Maxim Sokol; Mahdi Halabi; Yuval Mordekovitz; Sergey Kalabukhov; Shmuel Hayun; Nachum Frage

doi:10.1016/j.scriptamat.2017.06.049

An inverse Hall-Petch relation in nanocrystalline MgAl₂O₄ spinel consolidated by high pressure spark plasma sintering (HPSPS)

Maxim Sokol, Mahdi Halabi, Yuval Mordekovitz, Sergey Kalabukhov, Shmuel Hayun, Nachum Frage

Department of Materials Engineering

Ben-Gurion University of the Negev

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

Abstract

Inverse Hall-Petch behavior was observed in a transparent nanocrystalline magnesium aluminate spinel ceramic with grain size lower than 30 nm fabricated by high pressure spark plasma sintering (HPSPS). The ceramic was consolidated from 12 nm powder, synthesized by a solution combustion method and displayed an optical transmission of 80% at 550 nm wavelength. The hardness values of the specimens followed the Hall-Petch relation down to a grain size of about 30 nm, reaching a maximal hardness of 20 GPa. The hardness value decreased from 20 to 17.6 GPa when grain size decreased to 17 nm.

Original language	English
Pages (from-to)	159-161
Number of pages	3
Journal	Scripta Materialia
Volume	139
DOIs	https://doi.org/10.1016/j.scriptamat.2017.06.049
State	Published - 1 Oct 2017

Keywords

Hall-Petch
Nanocrystalline
SPS
Spinel

All Science Journal Classification (ASJC) codes

General Materials Science
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering
Metals and Alloys

Access to Document

10.1016/j.scriptamat.2017.06.049

Cite this

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title = "An inverse Hall-Petch relation in nanocrystalline MgAl2O4 spinel consolidated by high pressure spark plasma sintering (HPSPS)",

abstract = "Inverse Hall-Petch behavior was observed in a transparent nanocrystalline magnesium aluminate spinel ceramic with grain size lower than 30 nm fabricated by high pressure spark plasma sintering (HPSPS). The ceramic was consolidated from 12 nm powder, synthesized by a solution combustion method and displayed an optical transmission of 80% at 550 nm wavelength. The hardness values of the specimens followed the Hall-Petch relation down to a grain size of about 30 nm, reaching a maximal hardness of 20 GPa. The hardness value decreased from 20 to 17.6 GPa when grain size decreased to 17 nm.",

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author = "Maxim Sokol and Mahdi Halabi and Yuval Mordekovitz and Sergey Kalabukhov and Shmuel Hayun and Nachum Frage",

note = "Publisher Copyright: {\textcopyright} 2016 Elsevier Ltd",

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doi = "10.1016/j.scriptamat.2017.06.049",

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T1 - An inverse Hall-Petch relation in nanocrystalline MgAl2O4 spinel consolidated by high pressure spark plasma sintering (HPSPS)

AU - Sokol, Maxim

AU - Halabi, Mahdi

AU - Mordekovitz, Yuval

AU - Kalabukhov, Sergey

AU - Hayun, Shmuel

AU - Frage, Nachum

PY - 2017/10/1

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AB - Inverse Hall-Petch behavior was observed in a transparent nanocrystalline magnesium aluminate spinel ceramic with grain size lower than 30 nm fabricated by high pressure spark plasma sintering (HPSPS). The ceramic was consolidated from 12 nm powder, synthesized by a solution combustion method and displayed an optical transmission of 80% at 550 nm wavelength. The hardness values of the specimens followed the Hall-Petch relation down to a grain size of about 30 nm, reaching a maximal hardness of 20 GPa. The hardness value decreased from 20 to 17.6 GPa when grain size decreased to 17 nm.

KW - Hall-Petch

KW - Nanocrystalline

KW - SPS

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JO - Scripta Materialia

JF - Scripta Materialia

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