In-Situ Quantification of Solute Effects on Grain Boundary Mobility and Character in Aluminum Alloys during Recrystallization

Mitra L. Taheri; Anthony D. Rollett; Hasso Weiland

doi:10.4028/www.scientific.net/MSF.467-470.997

Paper Titles

Static Recrystallization of FeAl in the Presence of Second Phase Particles: Experimental and Modeling Investigations
p.975

Introduction of Second Phase Particle Shape in Monte Carlo Grain Growth Simulation
p.981

Influence of Particle Mechanisms on Kinetics of Grain Growth in a P/M Superalloy
p.985

Grain Boundary Area, Grain Boundary Curvature and Particle Pinning in an Al-1mass%Mn Alloy Containing Al₆Mn Precipitates
p.991

In-Situ Quantification of Solute Effects on Grain Boundary Mobility and Character in Aluminum Alloys during Recrystallization
p.997

Temporal Evolution of Grain Size Distributions in Two-Dimensional Pinned Cells
p.1003

Finite Element Simulations of 3D Zener Pinning
p.1009

Evolving 3D Microstructures Using a Genetic Algorithm
p.1019

Capillarity-Mediated Grain Growth in 3-D
p.1025

HomeMaterials Science ForumMaterials Science Forum Vols. 467-470In-Situ Quantification of Solute Effects on Grain...

In-Situ Quantification of Solute Effects on Grain Boundary Mobility and Character in Aluminum Alloys during Recrystallization

Abstract:

Aluminum alloys exhibit recrystallization kinetics that vary strongly with composition. The conventional understanding is that certain alloying elements, e.g. chromium, retard grain boundary motion due to the formation of fine dispersions of second phase particles, giving rise to particle drag of boundaries. There is countervailing evidence, however, that suggests that solute drag provides a stronger influence on grain boundary mobility. This paper presents new evidence for a pronounced effect of solute based on experiments in which individual boundaries migrate under the driving pressure of stored energy from prior plastic strain. As supported by the literature, boundaries exhibit a maximum mobility for a 38-39 degree <111> misorientation in initial annealing experiments. Specifically, this mobility maximum is asymmetric with a sharp cutoff below 38-39 degrees but a more gradual decrease at misorientations beyond 40 degrees. The occurrence of other, smaller mobility peaks is discussed within the context of the sharpening of evolving maxima with discussed within the context of the sharpening of evolving maxima with increased recrystallization. The presence of a minimum at 38-39 degrees is found at both higher temperatures and higher solute concentrations. This transition from a local mobility maximum to a minimum is discussed within the context of recent theories solute drag activity.