Sub-Boundary Mobilities during Recovery of Binary Al-Mn Alloys

Fabrice Barou; Claire Maurice; Jean Marie Feppon; Julian H. Driver

doi:10.4028/www.scientific.net/MSF.715-716.725

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Role of Inclination Dependent Anisotropy on Boundary Populations during Two-Dimensional Grain Growth
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Austenite Grain Refinement in Direct Charging Based Thermomechanical Processes
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Nonlinear Migration of Faceted Boundaries and Nonstationary Grain Growth in Ceramics
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Sub-Boundary Mobilities during Recovery of Binary Al-Mn Alloys
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The Weighted Burgers Vector: A Quantity for Constraining Dislocation Densities and Types Using Electron Backscatter Diffraction on 2D Sections through Crystalline Materials
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Mean Field and Finite Element Modeling of Static and Dynamic Recrystallization
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Fabrication of Nanocrystalline Dense Silicon Nitride Ceramics
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Modelling the Static Recrystallisation Texture of FCC Metals Using a Phase Field Method
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HomeMaterials Science ForumMaterials Science Forum Vols. 715-716Sub-Boundary Mobilities during Recovery of Binary...

Sub-Boundary Mobilities during Recovery of Binary Al-Mn Alloys

Abstract:

Two, high purity, Al-0.1 and 0.3wt%Mn alloys have been cold deformed in plane strain compression to strains of order 1.8 and the kinetics of subsequent recovery by sub-grain coarsening during annealing at 150-300°C measured by high resolution FEG-SEM EBSD. Accurate sub-grain size and misorientation distributions and their evolution with time and temperature have been determined. The average growth rates are then used to estimate the sub-grain boundary mobilities. Growth is analyzed by two well-known growth laws for the average sub-grain size δ (t): i) the standard relation for grain growth: where the exponent n takes values of 2-8 and ii) the relation proposed by Nes for dislocation climb in sub-grain walls: It is shown that the latter relation gives a better fit with the data in terms of the time and temperature dependence of the sub-grain sizes. In particular the activation energies for the logarithmic law are much closer to the values expected for solute-controlled movement of sub-boundaries.