Temperature dependence of abnormal grain growth in pure magnesium

In this work, grain growth characteristics of as-extruded pure magnesium was investigated for samples annealed at temperatures ranging from 300 degrees C to 450 degrees C for different times. The grain growth exponent of n = 4, indicating rapid coarsening, was determined. A normal grain growth behavior was observed both at low and high annealing temperatures. However, at intermediate annealing temperature, an abnormal grain growth was recorded. This temperature dependence of grain growth behavior was attributed to competition between dislocation density gradient and grain boundary mobility. (C) 2020 Elsevier B.V. All rights reserved.

Automated summary

The study investigated the grain growth characteristics of pure magnesium samples annealed at different temperatures, revealing a rapid coarsening process with a grain growth exponent of n = 4. Normal grain growth behavior was observed at both low and high annealing temperatures, while abnormal grain growth was recorded at intermediate annealing temperatures. This temperature dependence was attributed to the competition between dislocation density gradient and grain boundary mobility.