Producing Ultrafine-grained Materials by Equal Channel Angular Pressing: A Review
ZHANG Zhenwei1, WANG Junli2, ZHANG Qinglong1, SHI Qingnan1
1 School of Material Science and Engineering, Kunming University of Science and Technology, Kunming 650093; 2 Research Center for Analysis and Measurement, Kunming University of Science and Technology, Kunming 650093
Abstract: Equal channel angular pressing is one of the methods to prepare ultrafine grained materials by sever plastic deformation. The materials with large grain size can be extruded at room temperature. This thesis summarized the mold parameters of ECAP, influence factors of process conditions, the improvement of mold and preparation method, refinement mechanism, microstructure stability and properties of manufacturing ultrafine grained materials. Combined with the part of the research results, it shows that the ECAP mold is constantly being improved and optimized and composite extrusion technologies has appeared. Nowadays, it makes continuous ultrafine grained ECAP technology come true. Grain refinement of ECAP is mainly due to shear stress and the effect of the second phase particles. ECAP grain refinement mechanism and combined technology have become a hot research to-pic. Higher application requirements of ultrafine grained materials are raised in different areas. It is also a challenge severe plastic deformation manufacture technology itself.
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2017, Vol. 31 
