Microstructural development and tensile strength of an ECAP: deformed Al-4 wt. (%) Cu alloy

Materials Research

Érika Ferananda Prados¹  Vitor Luiz Sordi¹  Maurizio Ferrante¹ 

[1] ,Federal University of São Carlos Department of Materials Engineering São Carlos SP ,Brazil

关键词: ECAP;    Al-4%Cu;    SPD;    tensile properties;    microstructure;    work-hardening;   

DOI  :  10.1590/S1516-14392008000200015

来源: SciELO

【 摘 要 】

The tensile strength of metals and alloys can be considerably increased by severe plastic deformation, a consequence of the extreme grain refinement thus achieved. In the present work the deformation was performed by Equal Channel Angular Pressing and the material was an Al-4% Cu alloy. Characterization included tensile tests, and microstructural observation by optical and transmission electron microscopy. After four passes, the yield strength showed an increase of 310% over the undeformed alloy, a figure reduced to 160% by a 250 °C / 1 hour post - deformation anneal. Additionally, the alloy displayed a very low work hardening capacity, especially after the annealing heat treatment. After four deformation passes the grain size of the annealed specimens was estimated to be close to 500 nm. The tensile behaviour and the absence of work hardening were discussed in terms of the fine microstructure.

【 授权许可】

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