1 Prediction of Generation of High and Low Angle Grain Boundaries 1 (HAGB and LAGB) during severe plastic deformation 2 3 Jairo Alberto Muñoz 1, 2, 3 * , Raúl E. Bolmaro 2 , Alberto Moreira Jorge Jr 4, 5 , Alexander 4 Zhilyaev 6, 7 , José María Cabrera 1,8 5 1 Department of Materials Science and Engineering EEBE, Universidad Politecnica de 6 Catalunya, c/Eduard Maristany 10-14, 08019 Barcelona, Spain 7 2 Instituto de Física Rosario, Consejo Nacional de Investigaciones Científicas y Técnicas- 8 CONICET, Universidad Nacional de Rosario, Ocampo y Esmeralda, 2000 Rosario, Argentina 9 3 National University of Science and Technology “MISIS”, Moscow 119049, Russia. 10 4 Department of Materials Engineering, Federal University of Sao Carlos, 13565-905, Brazil 11 5 LEPMI and SIMAP Laboratories, CNRS UMR 5266, University of Grenoble Alpes, Institut 12 Polytechnique, BP. 75, St-Martin d'Heres, 38402, France. 13 6 Laboratory of Mechanics of Gradient Nanomaterials, Nosov Magnitogorsk State Technical 14 University, Magnitogorsk, 455000, Russia. 15 7 Institute for Metals Superplasticity Problems, Khalturina 39, Ufa, 450001, Russia 16 8 Research Institute in Metallurgy and Materials, Universidad Michoacana de San Nicolás de 17 Hidalgo, Edificio “U-3”, Ciudad Universitaria, 58030-Morelia, Michoacán, Mexico 18 19 20 * corresponding author: [email protected] 21 Abstract 22 It is well known that a balance between the generation of low angle and high angle grain 23 boundaries (LABG and HAGB) is achieved in materials undergoing a severe plastic 24 deformation (SPD) process. It is also observed that most annealed materials evolve from a 25 substantial fraction of LAGB at the early deformation steps towards a steady state in which an 26 equilibrium between LAGB and HAGB fractions is attained. In the present work, such a 27 balance is analyzed for different alloys, i.e., Cu, Al, and Fe based. A mathematical expression 28 is proposed for the amount of LAGB and HAGB as a function of the strain impaired which in 29 turn can be used to predict the number of passes (especially for ECAP) or the amount of total 30 deformation for any SPD process necessary to attain a steady microstructure. The model seeks 31 to serve as a first approximation of the mechanical and microstructural properties of ultrafine 32 grain metal materials. 33 Keywords: High angle grain boundaries (HAGB); low angle grain boundaries (LAGB); 34 continuous dynamic recrystallization (CDRX); grain size; dislocations, severe plastic 35 deformation (SPD) 36
Prediction of Generation of High and Low Angle Grain Boundaries (HAGB and LAGB) during severe plastic deformation
Jun 24, 2023
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