Affiliation:
1. Northeastern University
Abstract
ECAP is a continuous multi-pass extrusion process that enables the specimen to obtain considerable cumulative deformation to refine the grain. In this paper, ECAP was used to deform AS41 magnesium alloy at 350°C, and the microstructure was observed and analyzed. The results show that the ECAP process has excellent effect on grain refinement and uniform microstructure. The grain size of AS41 decreases from 200μm to 20μm, and the microstructure is more uniform than that of as-cast sample. The reason is that the original grain is broken and refined under the action of shear force, and dynamic recrystallization occurs at the same time, resulting in small recrystallized grains. The Mg2Si particles were redistributed during ECAP and uniformly distributed in the crystal in rod shape.
Publisher
Trans Tech Publications, Ltd.
Subject
Mechanical Engineering,Mechanics of Materials,General Materials Science
Reference12 articles.
1. V.M. Segal, V.I. Reznikov, A.E. Drobyshevskiy and V.I. Kopylov, Plastic metal working by simple shear, Russian Metallurgy 1 (1981) 115-123 (Engl. Transl.).
2. Xia K, Wang J T, Wu X, Chen, G, Gurvan, M, Equal channel angular pressing of magnesium alloy AZ31, J. Mater. Sci. Eng. A. 410 (2005), 324-327.
3. Zhang D, Li S, Orientation dependencies of mechanical response, microstructure and texture evolution in hot compression of AZ31 magnesium alloy processed by equal channel angular extrusion, J. Mater. Sci. Eng. A. 528 (2011), 4982-4987.
4. Figueiredo R B, Langdon T G, Grain refinement and mechanical behavior of a magnesium alloy processed by ECAP, J. Journal of Materials Science. 45 (2010), 4827-4836.
5. Minárik Peter, Vesely J , íek Jakub, Vlasák Tomá, Krajňák Tomá, Effect of secondary phase particles on thermal stability of ultra-fine grained Mg-4Y-3RE alloy prepared by equal channel angular pressing, J. Materials Characterization. 140 (2018) 207-216.