Effect of grain size on the static and dynamic mechanical properties of magnesium aluminate spinel (MgAl2O4)

被引：52

作者：

Sokol, M. ^{[1
]}

Kalabukhov, S. ^{[1
]}

Shneck, R. ^{[1
]}

Zaretsky, E. ^{[2
]}

Frage, N. ^{[1
]}

机构：

[1] Ben Gurion Univ Negev, Dept Mat Engn, POB 653, IL-8410501 Beer Sheva, Israel

[2] Ben Gurion Univ Negev, Dept Mech Engn, POB 653, IL-8410501 Beer Sheva, Israel

来源：

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 2017年 / 37卷 / 10期

关键词：

Dynamic mechanical properties; Grain size; Hall-Petch; Magnesium aluminate spinel; Static mechanical properties; STRENGTH; BRITTLE;

D O I：

10.1016/j.jeurceramsoc.2017.04.025

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Samples of transparent polycrystalline spinel with average grain size varying from 0.14 to 170 mu m were prepared by different sintering approaches. The effect of grain size on the flexural strength, hardness and Hugoniot elastic limit (impact loading) was investigated. It was found that values of hardness divided by three for samples with grain size in the 0.14-15 mu m range were almost equal to the dynamic yield strength values, estimated based on the Hugoniot elastic limit. This led to the assumption that the onset of inelastic deformation at the Hugoniot elastic limit was brittle rather than ductile. The observed departure of the dynamic yield strength from the hardness divided by three value for ceramics with grain size >15 mu m was associated with either impact-induced shear banding or twinning. The feasibility of such banding/twinning intervention in initiating inelastic deformation in the spinel is supported by the values of apparent Hall-Petch coefficients in the corresponding grain size domains. (C) 2017 Elsevier Ltd. All rights reserved.

引用

页码：3417 / 3424

页数：8

共 40 条

[1] Mechanical properties of magnesia-spinel composites [J].