발간논문

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Vol.39, No.2, 158 ~ 165, 2001
Title
Grain Refinement of 5083 Al Alloy by Severe Plastic Deformation Using ECA Pressing
이정국Jung Guk Lee,서창우Chang Woo Seo,장시영Si Young Chang,박경태Kyung Tae Park,신동혁Dong Hyuk Shin
Abstract
An ultrafine grained structure was introduced in a commercial 5083 Al alloy with the initial grain size of ∼200 ㎛ using the equal channel angular pressing technique. Equal channel angular pressing was successfully conducted at 200℃ and the results showed that the microstructure was reasonably homogeneous after single passage and consisted of parallel bands of elongated substructure having the average width of 0.2 ㎛ and the average length of 0.8 ㎛. Repetitive passes were conducted on the same sample up to total 8 passes through the die such that the sample was rotated 180° around its longitudinal axis between passes. An equiaxed ultrafine grained structure of ∼0.3 ㎛ was obtained in the present alloy after 8 passes. In addition, in this study, the feasibility of low temperature superplasticity of a ultrafine grained 5083 Al alloy was examined. It was found that a 5083 Al alloy with the grain size of ∼0.3 ㎛ exhibited a superplastic-like behavior with elongation to failure in excess of 200% below 250℃.
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