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Formation of nanocrystalline AZ31B Mg alloys via cryogenic rotary swaging

Journal of Magnesium and Alloys 2023年第5期11卷 1580-1591页

作者： Xin Chen Chuming Liu Yingchun Wan Shunong Jiang Xiuzhu Han Zhiyong Chen Light Alloy Research Institute Central South UniversityChangsha 410083China School of Materials Science and Engineering Central South UniversityChangsha 410083China School of Metallurgy and Environment Central South UniversityChangsha 410083China Beijing Institute of Spacecraft System Engineering Beijing 100094China

A bulk nanocrystalline AZ31B Mg alloy with extraordinarily high strength was prepared via cryogenic rotary swaging in this *** obtained alloy shows finer grains,higher strength,and a negligible tension-compression yield asymmetry,compared with that prepared via room-temperature rotary *** electron microscopy investigations showed that at the initial stage,multiple twins,mostly tension twins,were activated and intersected with each other,thereby refining the coarse grains into a fine lamellar ***,two types of nanoscale subgrains were generated with increasing swaging *** first type of nanoscale subgrain contained twin boundaries and low-angle grain *** type of subgrain appeared at the twin-twin intersections and was mainly driven by high local *** second type of nanoscale subgrain was formed within the twin *** boundaries of this type of subgrain did not contain twin boundaries and were transformed from massive dislocation ***,randomly oriented nanograins were obtained via dynamic recrystallization,under the combined function of deformation heat and increased stored *** with room-temperature rotary swaging,cryogenic rotary swaging exhibits a slower grain refinement process but a remarkably enhanced grain refinement effect after the same five-pass swaging.

关键词： Cryogenic rotary swaging Nanocrystalline Mg alloy Grain refinement Twinning dislocation arrays

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