Disappearance of the true threshold creep behaviour of an ODS Al-30SiC(p) composite at high temperatures

被引：24

作者：

Cadek, J. ^{[1
]}

Kucharova, K. ^{[1
]}

Zhu, S.J. ^{[1
]}

机构：

[1] Institute of Physics of Materials, Acad. of Sci. of the Czech Republic, Zizkova 22, 61662 Brno, Czech Republic

来源：

Materials Science and Engineering: A | 2000年 / 281卷 / 1-2期

关键词：

Alumina - Aluminum - Creep - Dislocations (crystals) - Silicon carbide - Stress analysis;

D O I：

10.1016/S0921-5093(99)00742-X

中图分类号：

学科分类号：

摘要：

The creep behaviour of an oxide dispersion strengthened (ODS) Al-30SiCp composite has been investigated in a broad temperature interval ranging from 623 to 798 K. At temperatures up to 723 K true threshold creep behaviour occurs, while at temperatures above 723 K no true threshold stress has been found. Accepting the creep model of Rosler and Arzt, the creep behaviour of this composite at temperatures ranging from 748 to 798 K is interpreted in terms of the thermally activated detachment of dislocations from small alumina particles in the composite matrix. The disappearance of the true threshold stress at temperatures above 723 K is then due to a transition from athermal to thermally activated detachment of dislocations from alumina particles.

引用

页码：162 / 168