Superplastic nanocrystalline ceramics at room temperature and high strain rates

被引：27

作者：

Zhang, J. Y. ^{[1
]}

Sha, Z. D. ^{[1
]}

Branicio, P. S. ^{[1
]}

Zhang, Y. W. ^{[1
]}

Sorkin, V. ^{[1
]}

Pei, Q. X. ^{[1
]}

Srolovitz, D. J. ^{[2
,3
]}

机构：

[1] Agcy Sci Technol & Res, Inst High Performance Comp, Singapore 138632, Singapore

[2] Univ Penn, Dept Mat Sci & Engn, Philadelphia, PA 19104 USA

[3] Univ Penn, Dept Mech Engn & Appl Mech, Philadelphia, PA 19104 USA

来源：

SCRIPTA MATERIALIA | 2013年 / 69卷 / 07期

关键词：

Nanostructured ceramics; Superplasticity; High strain rates; Grain size effect; Silicon carbide; SIC NANOWIRES; MOLECULAR-DYNAMICS; PLASTIC-FLOW; DIFFUSION; DUCTILITY; CARBIDE; CREEP;

D O I：

10.1016/j.scriptamat.2013.06.017

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Tensile-loading molecular dynamics simulations show that nanocrystalline SiC not only becomes ductile, but can be superplastically deformed at room temperature when grain sizes are reduced to d similar to 2 nm. The calculated strain rate sensitivity, 0.67, implies a superplastic ceramic able to attain strains of up to 1000% at room temperature and typical strain rates (similar to 10(-2) s(-1)). The origin of the superplasticity is linked to an unusually steep rise in creep rate to 10(6) s(-1) for d = 2 nm. The results explain recent observations in SiC nanowires and suggest novel opportunities for structural ceramics. (C) 2013 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：525 / 528

页数：4

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