Distribution of Order Parameter in Solids under High Pressure Torsion

Severe plastic deformation (SPD) can lead to various phase transformations. High-pressure torsion (HPT) is one of the most important variants of SPD. In principle, HPT can continue almost indefinitely long, as long as the plungers are not destroyed. However, the number of defects in a material durin...

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Bibliographic Details
Published inMaterials Vol. 15; no. 19; p. 6970
Main Authors Straumal, Petr, Zavorotnev, Yuri, Metlov, Leonid, Popova, Olga
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 07.10.2022
MDPI
Subjects
Angular acceleration
Approximation
Defects
Equilibrium
High pressure
high pressure torsion
Landau phenomenological theory
order parameter
Order parameters
phase transformations
Phase transitions
Plastic deformation
Plungers
solids
Steady state
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Summary:Severe plastic deformation (SPD) can lead to various phase transformations. High-pressure torsion (HPT) is one of the most important variants of SPD. In principle, HPT can continue almost indefinitely long, as long as the plungers are not destroyed. However, the number of defects in a material during HPT deformation cannot increase indefinitely. When the rate of defects production becomes equal to the rate of their annihilation, a steady state or dynamic equilibrium is reached. Unexplored is the issue of establishing equilibrium at the initial stage of plunger torsion, when there is an angular acceleration. The parameters of the steady state are described here using the idea of an order parameter in solids in the framework of Landau phenomenological theory and the Landau–Khalatnikov equation.
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ISSN:1996-1944
1996-1944
DOI:10.3390/ma15196970