| Title |
Grain Refinement of 5083 Al Alloy by Severe Plastic Deformation Using ECA Pressing |
| Authors |
이정국(Jung Guk Lee),서창우(Chang Woo Seo),장시영(Si Young Chang),박경태(Kyung Tae Park),신동혁(Dong Hyuk Shin) |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| 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℃. |