Equal Channel Angular Pressing and Torsion (ECAPT) for Densification and Strengthening Properties of Powder Sintered Materials

Abstract

Severe Plastic Deformation（SPD）methods are hot research techniques of preparation of bulk ultrafine-grained materials and strengthening the material properties currently .Among the various SPD methods, ECAPT that a new method of ECAP （Equal channel angular pressing） organic integrates with TE（Twist extrusion）was key introduced for the frist time ,and experimental study on ECAPT technology for deformation and densification of pure Al and Mo powder sintered materials were carried out and the results were compared with that of ECAP in this paper.The results show that there have more effective and more stronger severe plastic deformation during the process of ECAPT and it improves the ability of material’s plastic deformation and strengthens the material properties.In forming process of ECAPT after three passes,the grain size of powder sintering reduces the average 200%, and there has its nearly full density and comprehensive performance materials to improve overall performance significantly.It is confirmed that there have better comprehensive mechanical properties of strengthening materials and more stronger severe plastic deformation during the process of ECAPT contrast to the ECAP, too.