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The effect of severe plastic deformation on the Mg properties after CEC deformation

Journal of Magnesium and Alloys 2020年第3期8卷 761-768页

作者： B.Suikowski M.Janoska g.boczkal R.Chulist M.Mroczkowski P.Paika Department of Non-Ferrous Metals Engineering Faculty of Non-Ferrous MetalsAGH University of Science and Technology30 Mickiewicza Av.Krakow 30-059Poland Institute of Metallurgy and Materials Science Polish Academy of Sciences25 Reymonta St.Krakow 30-059Poland

In this study,the effect of severe plastic deformation on the Mg grain refinement and recovery mechanism was *** pure magnesium was deformed at room temperature by cycling extrusion-compression(CEC)process up to large *** steps of deformation have been used by applying 1,2 and 4 passes of CEC giving a total effective plastic strain ofε=*** and structural properties of Mg in initial state and the states after successive steps of deformation were *** mechanical properties were determined by microhardness and compression tests at room *** structural investigations involved light microscope observations,electron back scattered diffraction and texture measurements by X-ray *** was found that the CEC process refines the grain size down to 6.4μm and reduces strong rolling texture ***,only the first two passes had a strong effect on mechanical properties while a larger number of CEC cycles(above 4)led to failure of the samples with a small effect on *** observation correlates with texture evolution indicating a more random orientation distribution that slows down the typical for hep metals rapid work *** was found that the CEC process activated twin dynamic recrystallization in deformed *** process led to the formation of new randomly oriented grains inside the twinned areas and as a consequence it reduced the strong rolling texture components.

关键词： Magnesium Cyclic extrusion compression Texture Microhardness

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