A MICROMECHANICAL MODEL FOR CREEP IN SHORT-FIBER-REINFORCED ALUMINUM-ALLOYS

被引：85

作者：

DLOUHY, A

EGGELER, G

MERK, N

机构：

[1] Swiss Federal Institute of Technology Lausanne, LMM, EPFL, 1015 Lausanne, MX-D Ecublens

来源：

ACTA METALLURGICA ET MATERIALIA | 1995年 / 43卷 / 02期

关键词：

D O I：

10.1016/0956-7151(94)00255-G

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Three elementary microstructural processes control creep of short fibre reinforced, squeeze cast aluminium alloys: (i) loading of fibres by dislocations through the formation of a work hardened zone (WHZ), (ii) a recovery mechanism which decreases the dislocation density in the WHZ, and (iii) multiple breakage of fibres. A uniaxial micromechanical model is presented which is based on these three elementary processes. The model rationalizes the shape of individual creep curves as well as the temperature and stress dependence of the minimum creep rate. The minimum creep rate is shown to result from a superposition of primary (loading of fibres by dislocations) and tertiary (breakage of fibres and shortening of the length of the recovery path) processes.

引用

页码：535 / 550

页数：16

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