1 State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China 2 School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China
Abstract: Conventional ECAP is greatly limited in the continuous application of materials, so it is impossible to prepare longer bars. In this work, conti-nuous ECAP (C-ECAP) was used to extrude pure aluminum for four passes, and the effects of different passes on the microstructure, texture evolution, strength and hardness of pure aluminum were studied. The results showed that the initial grain size got refined from 47.9 μm to 1.1 μm, the microstructure distribution became more uniform, and the proportion of large-angle grain boundaries was increased from 5.9% to 12.6%. The deformed grains gradually transformed into sub-grains and recrystallized grains, and dynamic recrystallization reduced the dislocation density. The initial structure changed from coarse equiaxed grains to fine equiaxed grains. After 1-pass and 4-pass extrusion, the texture changed from {112}〈111〉 copper texture and {110}〈112〉 brass texture to {001}〈100〉 cube texture. The strength and hardness increased significantly, as the yield strength, tensile strength and hardness reached 95.6 MPa, 162.2 MPa and HV53.3 respectively after 4 passes, and the comprehensive mechanical properties became better.
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2025, Vol. 39 
