A New Method of Predicting the Structural and Mechanical Change of Materials during Extrusion by the Method of Multiple Plastic Deformations

The formulation of the Hall–Petch relationship in the early 1950s has raised immense interest in studying the influence of the grain size of solid materials on their properties. Grain refinement can be achieved through extreme deformation. In the presented study, Equal-Channel Angular Pressing (ECAP...

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Bibliographic Details
Published in:Materials 2021-05, Vol.14 (10), p.2594
Main Authors: Harničárová, Marta, Valíček, Jan, Kušnerová, Milena, Palková, Zuzana, Kopal, Ivan, Borzan, Cristina, Kadnár, Milan, Paulovič, Stanislav
Format: Article
Language:English
Subjects:
Alloys
Crystal lattices
Deformation
Ductility
Equal channel angular pressing
Extrusion rate
Friction
Grain refinement
Grain size
Mechanical properties
Metal fatigue
Methods
Nanostructured materials
Shear strain
Strain hardening
Ultrafines
Yield stress
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Summary:The formulation of the Hall–Petch relationship in the early 1950s has raised immense interest in studying the influence of the grain size of solid materials on their properties. Grain refinement can be achieved through extreme deformation. In the presented study, Equal-Channel Angular Pressing (ECAP) was successfully applied to produce an ultrafine-grained microstructure in a pure commercial Cu of 99.9 wt%. Samples were processed by ECAP at 21 °C for six passes via route A. A new equation of equilibrium that allows the exact determination of the number of extrusions and other technological parameters required to achieve the desired final grain size has been developed. The presented research also deals, in a relatively detailed and comparative way, with the use of ultrasound. In this context, a very close correlation between the process functions of extrusion and the speed of longitudinal ultrasonic waves was confirmed.
ISSN:1996-1944
1996-1944
DOI:10.3390/ma14102594