As a new type of severe plastic deformation method (SPD), deformation of twist extrusion (TE) is mainly determined by the twist angle α and the helix angle β. And when the length of the spiral channel is constant, the twist angle α is indirectly decided to the helix angle β. The numerical simulation model of CuZnAl powder material was established by the finite element software Deform-3D and the influence of the different twist angle α on its densification behavior was simulated in the paper.

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... results show that spiral channel in TE die structure is a strong shear plastic deformation area and can produce high hydrostatic pressure, and then promotes material density of the powder porous materials. Moreover, the larger twist angle is favorable for densification of the sintered powder material but the densification of the material is not exactly proportional to the twist angleα, and it is the optimized design for TE die because of the minimal uniformity coefficient and the best relative density distribution for the twist angle 270°, too.