MICROSTRUCTURE AND CREEP-PROPERTIES OF DISPERSION-STRENGTHENED ALUMINUM-ALLOYS

被引：126
作者：
ROSLER, J
JOOS, R
ARZT, E
机构：
[1] ASEA BROWN BOVERI LTD,CORP RES,CH-5405 BADEN,SWITZERLAND
[2] UNIV STUTTGART,W-7000 STUTTGART 80,GERMANY
来源：
METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 1992年 / 23卷 / 05期
关键词：
D O I：
10.1007/BF02647335
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The mechanical properties of dispersion-strengthened aluminum alloys, with various dispersoid types, volume fractions, and grain structures, were investigated in conjunction with systematic microstructural examinations. New theoretical concepts, based on thermally activated dislocation detachment from dispersoid particles, were used to analyze the creep behavior. A particularly strong dispersoid-dislocation interaction was identified as reason for the excellent creep properties of carbide dispersion-strengthened aluminum. Oxide particles (Al2O3, MgO) seem to exert a weaker interaction force and are therefore less efficient strengtheners. Although fine crystalline in the as-extruded condition, all alloys are remarkably resistant against diffusional creep. It is demonstrated that this behavior can be consistently understood by extending the concept developed for the interaction between bulk dislocations and dispersoids to grain boundary dislocations.
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收藏
页码：1521 / 1539
页数：19
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