MECHANICAL-PROPERTIES OF QUASI-CRYSTALLINE AND CRYSTALLINE PHASES IN AL-CU-FE ALLOYS

被引：149

作者：

KOSTER, U

LIU, W

LIEBERTZ, H

MICHEL, M

机构：

[1] Department of Chemical Engineering, University of Dortmund

来源：

JOURNAL OF NON-CRYSTALLINE SOLIDS | 1993年 / 153卷

关键词：

Aluminum copper iron alloys - Icosahedral quasicrystals - Indentation - Plastic deformation - Three point bending;

D O I：

10.1016/0022-3093(93)90393-C

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：

Mechanical properties of icosahedral AlCuFe quasicrystals were investigated and compared with those of related crystalline intermetallic compounds by means of indentation and three-point bending techniques. Quasicrystalline phases possess high hardness (HV almost-equal-to 1000) and high ability for elastic recovery (H/E > 0.08) but exhibit low toughness against unstable fracture (K(IC) almost-equal-to 1 MPa m1/2). Icosahedral particles embedded in Al2Cu or in AlFe crystalline matrices lead to increasing resistance against subcritical crack propagation. In contrast to cleavage #1 fracture in crystalline Al13Fe4, the icosahedral quasicrystals exhibit a rough, quasicleavage #1 fracture surface. Evidences for plastic deformation in the quasicrystals were found and its mechanism is discussed.

引用

页码：446 / 452

页数：7