Texture enhancement during grain growth of magnesium alloy AZ31B
Abstract
In this paper, the microstructure and texture evolution during annealing of rolled Mg alloy AZ31B, at temperatures ranging from 260 to 450°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 ~15 MRD during annealing at 400 and 450°C. Furthermore, a specific texture component {0001}(1120) is observed in the orientation distribution, which increases from 10 to 23 MRD at 400°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 ~30° misorientation about the <0001> direction, and this boundary type persists throughout most annealing treatmentsmore »
- Authors:
-
- Univ. of Virginia, Charlottesville, VA (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE)
- OSTI Identifier:
- 1265309
- Alternate Identifier(s):
- OSTI ID: 1318776
- Grant/Contract Number:
- AC05-00OR22725; CMMI 1235259
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Acta Materialia
- Additional Journal Information:
- Journal Volume: 86; Journal ID: ISSN 1359-6454
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; Grain size distribution; Grain boundary; Orientation distribution; Abnormal grain growth; Anomalous grain growth
Citation Formats
Bhattacharyya, Jishnu J., Agnew, S. R., and Muralidharan, G. Texture enhancement during grain growth of magnesium alloy AZ31B. United States: N. p., 2015.
Web. doi:10.1016/j.actamat.2014.12.009.
Bhattacharyya, Jishnu J., Agnew, S. R., & Muralidharan, G. Texture enhancement during grain growth of magnesium alloy AZ31B. United States. https://doi.org/10.1016/j.actamat.2014.12.009
Bhattacharyya, Jishnu J., Agnew, S. R., and Muralidharan, G. Sat .
"Texture enhancement during grain growth of magnesium alloy AZ31B". United States. https://doi.org/10.1016/j.actamat.2014.12.009. https://www.osti.gov/servlets/purl/1265309.
@article{osti_1265309,
title = {Texture enhancement during grain growth of magnesium alloy AZ31B},
author = {Bhattacharyya, Jishnu J. and Agnew, S. R. and Muralidharan, G.},
abstractNote = {In this paper, the microstructure and texture evolution during annealing of rolled Mg alloy AZ31B, at temperatures ranging from 260 to 450°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 ~15 MRD during annealing at 400 and 450°C. Furthermore, a specific texture component {0001}(1120) is observed in the orientation distribution, which increases from 10 to 23 MRD at 400°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 ~30° misorientation about the <0001> direction, and this boundary type persists throughout most annealing treatments explored.},
doi = {10.1016/j.actamat.2014.12.009},
journal = {Acta Materialia},
number = ,
volume = 86,
place = {United States},
year = {Sat Jan 03 00:00:00 EST 2015},
month = {Sat Jan 03 00:00:00 EST 2015}
}
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Works referencing / citing this record:
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