A novel single pass severe plastic deformation method using combination of planar twist extrusion and conventional extrusion

2019 ◽  
Vol 47 ◽  
pp. 427-436 ◽  
Author(s):  
G.R. Ebrahimi ◽  
A. Barghamadi ◽  
H.R. Ezatpour ◽  
A. Amiri
Keyword(s):  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
Deformation Method ◽  
Single Pass ◽  
Twist Extrusion

scholarly journals An Investigation on Microstructure, Texture and Mechanical Properties of AZ80 Mg Alloy Processed by Annular Channel Angular Extrusion

Materials ◽  
2019 ◽  
Vol 12 (6) ◽  
pp. 1001 ◽  
Author(s):  
Xi Zhao ◽  
Shuchang Li ◽  
Yong Xue ◽  
Zhimin Zhang
Keyword(s):  
Mechanical Properties ◽  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
Texture Evolution ◽  
Boundary Migration ◽  
Annular Channel ◽  
Mg Alloy ◽  
Deformation Method ◽  
Single Pass ◽  
Angular Extrusion

Annular channel angular extrusion has been recently developed as a new single-pass severe plastic deformation method suitable for producing large size cup-shaped parts from cylindrical billets. In this study, the novel technology was successfully applied to commercial AZ80 Mg alloy at 300 °C, and microstructure, texture evolution, and mechanical properties were investigated. Due to severe shear deformation, the initial microstructure, including the coarse grains and large eutectic β-phases, was greatly refined. The strong basal texture formed during the initial deformation stage was modified into a weak tilted dynamic texture. During the deformation process, fine β-particles separated from eutectic phases effectively hindered the grain boundary migration and rotation, enhancing the grain refinement and texture weakening. More than 63% of the microhardness increase was achieved in this extruded part. Also, tensile tests showed the yield strength and elongation in both directions (transverse and longitudinal) of extruded part were improved more than 2.5 times, and the ultimate tensile strength was improved more than 2 times, compared to the initial material state. The improved material properties were mainly attributed to microstructure (grain and phase) refinement and texture weakening. It was demonstrated that the annular channel angular extrusion process can be considered as a novel and effective single-pass severe plastic deformation method.

scholarly journals Decade of Twist Channel Angular Pressing: A Review

Materials ◽  
2020 ◽  
Vol 13 (7) ◽  
pp. 1725 ◽  
Author(s):  
Adéla Macháčková
Keyword(s):  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
Equal Channel Angular Pressing ◽  
Metallic Materials ◽  
Single Pass ◽  
Angular Pressing ◽  
Processed Material ◽  
Twist Extrusion ◽  
Strain Paths

The methods of severe plastic deformation (SPD) have gained attention within the last decades primarily owing to their ability to substantially refine the grains within metallic materials and, therefore, significantly enhance the properties. Among one of the most efficient SPD methods is the equal channel angular pressing (ECAP)-based twist channel angular pressing (TCAP) method, combining channel twist and channel bending within a single die. This unique die affects the processed material with three independent strain paths during a single pass, which supports the development of substructure and efficiently refines the grains. This review is intended to summarize the characteristics of the TCAP method and its main features documented within the last decade, since its development in 2010. The article is supplemented with a brief characterization of other known SPD methods based on the combination of ECAP and twist extrusion (TE) within a single die.

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