Creep properties of aluminium processed by ECAP

被引:4
|
作者
Kral, P. [1 ,2 ]
Dvorak, J. [1 ,2 ]
Jager, A. [3 ]
Kvapilova, M. [1 ,2 ]
Horita, Z. [4 ]
Sklenicka, V. [1 ,2 ]
机构
[1] ASCR, Inst Phys Mat, Zizkova 22, Brno 61662, Czech Republic
[2] ASCR, Inst Phys Mat, CEITEC IPM, Zizkova 22, Brno 61662, Czech Republic
[3] ASCR, Inst Phys, Slovance 2, Prague 18221 1, Czech Republic
[4] Kyushu Univ, Fac Engn, Dept Mat Sci & Engn, Fukuoka 8128581, Japan
来源
KOVOVE MATERIALY-METALLIC MATERIALS | 2016年 / 54卷 / 06期
关键词
equal channel angular pressing (ECAP); aluminium; ultrafine-grained microstructure; creep; ULTRAFINE-GRAINED CU; NANOSTRUCTURED MATERIALS; DEFORMATION RESISTANCE; CHANNEL; MICROSTRUCTURE; BEHAVIOR; REFINEMENT; MECHANISMS; EVOLUTION; ALLOY;
D O I
10.4149/km_2016_6_441
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The creep behaviour of pure polycrystalline aluminium and single crystals processed by equal-channel angular pressing (ECAP) was investigated in order to understand the relationships between heterogeneity of microstructure and creep behaviour. Tensile creep tests were performed at 373 K on specimens processed by 1 and 4 ECAP passes. For comparison purposes, the creep tests were also carried out on coarse-grained specimens. Microstructure analyses showed that application of ECAP technique on polycrystalline aluminium and single crystals led to the formation of significantly different microstructures even after a relatively high number of ECAP passes. The different creep behaviour of ECAP-processed single crystals and polycrystalline aluminium is influenced by inhomogeneity of microstructure. Further, the creep behaviour of specimens processed by 4 ECAP passes is affected by grain-boundary mediated processes like enhanced recovery of dislocations at high-angle grain boundaries in grains finer than quasi-stationary subgrain size and grain boundary sliding.
引用
收藏
页码:441 / 451
页数:11
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