Texture enhancement during grain growth of magnesium alloy AZ31B

被引:197
作者
Bhattacharyya, J. J. [1 ]
Agnew, S. R. [1 ]
Muralidharan, G. [2 ]
机构
[1] Univ Virginia, Dept Mat Sci & Engn, Charlottesville, VA 22904 USA
[2] Oak Ridge Natl Lab, Div Mat Sci & Technol, Oak Ridge, TN 37831 USA
基金
美国国家科学基金会;
关键词
Grain size distribution; Grain boundary; Orientation distribution; Abnormal grain growth; Anomalous grain growth; COMPUTER-SIMULATION; RECRYSTALLIZATION; EVOLUTION; TEMPERATURE; BEHAVIOR; MG; MICROSTRUCTURE; DISTRIBUTIONS; MECHANISMS; DIFFUSION;
D O I
10.1016/j.actamat.2014.12.009
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The microstructure and texture evolution during annealing of rolled Mg alloy AZ31B, at temperatures ranging from 260 to 450 degrees C, is characterized, and a grain growth exponent of n=5, indicating inhibition of grain growth, is observed. Broadening of the normalized grain size distributions, which indicates abnormal grain growth, was observed at all temperatures investigated. It is shown, using a Zener-type analysis for pinning of grain boundaries by particles, that impurity-based particles are responsible for grain growth inhibition and abnormal grain growth. The strong basal texture which develops during rolling of the Mg alloy, resulting in an initial peak intensity in the (0002) pole figure of nine multiples of a random distribution (MRD), increases to similar to 15 MRD during annealing at 400 and 450 degrees C. Moreover, a specific texture component {0001} < 11 (2) over bar0 > is observed in the orientation distribution, which increases from 10 to 23 MRD at 400 degrees C. It is hypothesized that the anisotropic grain boundary properties (i.e. low angle boundaries have low energy and mobility) are responsible for the texture strengthening. Additionally, electron backscattered diffraction reveals the recrystallized microstructure to contain a significant number of boundaries with similar to 30 misorientation about the < 0001 > direction, and this boundary type persists throughout most annealing treatments explored. (C) 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码:80 / 94
页数:15
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