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Title: Texture enhancement during grain growth of magnesium alloy AZ31B

Journal Article · · Acta Materialia
 [1];  [1];  [2]
  1. Univ. of Virginia, Charlottesville, VA (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

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.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
Grant/Contract Number:
AC05-00OR22725; CMMI 1235259
OSTI ID:
1265309
Alternate ID(s):
OSTI ID: 1318776
Journal Information:
Acta Materialia, Vol. 86; ISSN 1359-6454
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 154 works
Citation information provided by
Web of Science

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Cited By (6)

Exploring the mechanism of “Rare Earth” texture evolution in a lean Mg–Zn–Ca alloy journal May 2019
Magnesium extrusion alloys: a review of developments and prospects journal January 2018
Non-dissociated dislocations in an AZ31 alloy revealed by transmission electron microscopy journal January 2020
Ultra-high strength Mg-9Gd-4Y-0.5Zr alloy with bi-modal structure processed by traditional extrusion journal October 2016
Elucidating the effect of intermetallic compounds on the behavior of Mg–Gd–Al–Zn magnesium alloys at elevated temperatures journal October 2017
Correlation between dynamic recrystallization and formation of rare earth texture in a Mg-Zn-Gd magnesium alloy during extrusion journal November 2018

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