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

被引：67

作者：

Sokol, Maxim ^{[1
]}

Halabi, Mahdi ^{[1
]}

Mordekovitz, Yuval ^{[1
]}

Kalabukhov, Sergey ^{[1
]}

Hayun, Shmuel ^{[1
]}

Frage, Nachum ^{[1
]}

机构：

[1] Ben Gurion Univ Negev, Dept Mat Engn, POB 653, IL-84105 Beer Sheva, Israel

来源：

SCRIPTA MATERIALIA | 2017年 / 139卷

关键词：

Hall-Petch; Nanocrystalline; Spinel; SPS; MAGNESIUM ALUMINATE SPINEL; GRAIN-SIZE; HARDNESS; MICROSTRUCTURE; MODULUS;

D O I：

10.1016/j.scriptamat.2017.06.049

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

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. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：159 / 161

页数：3

共 24 条

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