Grain Refinement by Combined ECAE/Extrusion and Dieless Drawing Processes for AZ31 Magnesium Alloy Tubes

Abstract:

Grain refinement processing by severe deformation, combined equal-channel angular extrusion (ECAE) processing and conventional tube extrusion, is applied to AZ31 magnesium alloy. By a combination of ECAE processing and tube extrusion, a fabricated tube, with outer and inner diameters of 2 mm and 1 mm, respectively, has fine, homogeneous, and equiaxed grain structure with an average grain size of 1.5m. Tensile test results indicate that the fine-grained tubes exhibited a superplasticity potential m value of 0.55.The maximum elongation (688%) is obtained at a temperature of 673K. Furthermore, the tubes fabricated by combined ECAE/extrusion process is applied to dieless drawing process without using any tool and die.As a result, dieless drawing limit is enhanced due to high m value achieved by combined ECAE/Extrusion process. From these results, the effectiveness of new grain refinement processing for fabricating fine-grained tubes and its application for dieless drawing process to fabricate the fine tubes was demonstrated experimentally.

• Periodical: Materials Science Forum (Volumes 654-656)
• Pages: 735-738
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.654-656.735
• Online since: June 2010
• Authors: Tsuyoshi Furushima, Tetsuhide Shimizu, Kenichi Manabe
• Keywords: AZ31 Magnesium Alloy, Dieless Drawing, ECAE, Extrusion, Grain Refinement, Tube

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