Tales of the Abnormal: Nanocrystalline Grain Growth at Low Temperatures

Heiko Paul; Jules M. Dake; Carl E. Krill III

doi:10.4028/www.scientific.net/MSF.715-716.315

Paper Titles

Austenite Grain Growth Kinetics during Continuous Heating of a Microalloyed X-80 Linepipe Steel
p.292

The Influence of Strain on Annealing Behaviour of Heavily Rolled Aluminium AA1050
p.297

Strain Induced Inward Grain Growth during Recrystallisation in Steel Sheets with BCC Crystal Structure
p.303

Recrystallization Processes in a Ni-20%Cr Alloy Subjected to High-Pressure Torsion
p.309

Tales of the Abnormal: Nanocrystalline Grain Growth at Low Temperatures
p.315

The Effect of Temperature on Microstructure Evolution in a 7055 Aluminum Alloy Subjected to ECAP
p.317

Thermodynamic Stabilization of Grain Size in Nanocrystalline Metals
p.323

Boundary Migration during Recrystallization of Heavily Deformed Pure Nickel
p.329

Self-Limited to Parabolic Grain Growth Kinetics in Metal Oxide Thin Films
p.333

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Tales of the Abnormal: Nanocrystalline Grain Growth at Low Temperatures

Abstract:

Employing x-ray diffractometry and electron microscopy, we have investigated thermally induced microstructural evolution in ball-milled nanocrystalline Fe. At low annealing temperatures, the early-stage growth of the area-weighted and volume-weighted average grain sizes deviates strongly from the parabolic behavior expected for normal grain growth. Analysis of the ratio of these two averages indicates that the width of the grain-size distribution changes with time. This result is more consistent with the occurrence of a transient stage of abnormal grain growth than with a grain-size-dependent change in the rate-limiting mechanism for grain-boundary migration.