Achieving microstructures prone to superplastic deformation in an Al-Zn-Mg-Cu alloy by equal channel angular pressing

JOURNAL OF ALLOYS AND COMPOUNDS

卷:546

Article

Cepeda-Jimenez, C. M.¹  Garcia-Infanta, J. M.¹  Ruano, O. A.¹  Carreno, F.¹ 

[1] CENIM CSIC, Dept Met Phys, Madrid 28040, Spain

关键词: Aluminium alloys;    ECAP;    Mechanical properties;    Microstructure;    Deformation mechanisms;   

DOI  :  10.1016/j.jallcom.2012.08.084

来源: Elsevier

【 摘 要 】

An Al-Zn-Mg-Cu alloy without Sc or Zr additions was subjected to overaging and processing by equal channel angular pressing, obtaining a grain size of similar to 160 nm and a fraction of high-angle boundaries of 56%. The high elongations attained at high strain rate (10 (2)-10 (3) s(1)) and low test temperature (250-300 degrees C) are attributed to the formation of new recrystallized grains, similar to 500 nm in size, during heating at test temperature. The presence of equiaxed grains and texture randomization in the gauge length confirms that grain boundary sliding is the operative deformation mechanism in the mentioned range of testing conditions. (c) 2012 Elsevier B.V. All rights reserved.

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