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Work-softening behavior of the ultrafine-grained Al alloy processed by high-strain-rate, dissimilar-channel angular pressing

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Abstract

Commercially pure Al alloy sheets were processed using high-strain-rate, dissimilar-channel angular pressing (DCAP) for as many as 100 passages through a channel with φ=120 deg, to investigate the work hardening caused by a low strain level (ɛ<2) and the work softening caused by an extremely high strain level (3<ɛ<58). The hardness of the alloy increased significantly by a factor of 2 at strains less than ∼2, while a gradual decrease in the hardness was observed at strains greater then ∼2. The work-hardening and the work-softening behaviors observed from the Al alloy were analyzed by correlating the measured properties with microstructural evolutions observed by transmission electron microscopy (TEM). A detailed microstructural-evolution sequence occurring at successive strain stages was also investigated based on TEM and electron backscattered diffraction (EBSD).

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Authors and Affiliations

  1. the Division of Materials Science and Engineering, Korea Institute of Science and Technology, Cheongryang, 130-136, Seoul, Korea

    Jae-Chul Lee (Principal Research Scientist), Jin-Yoo Shu (Research Scientist) & Jae Pyung Ahn (Research Scientist)

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  1. Jae-Chul Lee
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  2. Jin-Yoo Shu
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  3. Jae Pyung Ahn
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Lee, JC., Shu, JY. & Ahn, J.P. Work-softening behavior of the ultrafine-grained Al alloy processed by high-strain-rate, dissimilar-channel angular pressing. Metall Mater Trans A 34, 625–632 (2003). https://doi.org/10.1007/s11661-003-0097-x

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  • DOI: https://doi.org/10.1007/s11661-003-0097-x

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