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. These are preheat zone, extrusion zone, initial deformation zone, forged zone and post heat/cool down zone. The preheat zone is the region neighboring the edge of the shoulder circumference......
)), some spherical powders show an obviously irregular and sharp edge, and the consolidation of the powders caused by their collision is more severe. When the milling time is longer than 4 h (Figs. 11(d, e......
