Plastic strain-induced grain refinement in the nanometer scale in a Mg alloy

Sun, H. Q., Shi, Y. -N., Zhang, M. -X. and Lu, K. (2007) Plastic strain-induced grain refinement in the nanometer scale in a Mg alloy. Acta Materialia, 55 3: 975-982. doi:10.1016/j.actamat.2006.09.018


Author Sun, H. Q.
Shi, Y. -N.
Zhang, M. -X.
Lu, K.
Title Plastic strain-induced grain refinement in the nanometer scale in a Mg alloy
Journal name Acta Materialia   Check publisher's open access policy
ISSN 1359-6454
1873-2453
Publication date 2007-02-01
Year available 2006
Sub-type Article (original research)
DOI 10.1016/j.actamat.2006.09.018
Open Access Status Not yet assessed
Volume 55
Issue 3
Start page 975
End page 982
Total pages 8
Editor Mahajan, S.
Place of publication Oxford
Publisher Pergamon
Language eng
Subject 291403 Alloy Materials
C1
670899 Other non-ferrous metals (e.g. copper, zinc)
0912 Materials Engineering
Abstract By means of surface mechanical attrition treatment, nanometer-sized grains (with an average size of 30 ± 5 nm) were generated in the surface layer of a single-phase AZ91D alloy. Transmission electron microscopy investigations showed that the strain-induced grain refinement process in AZ91D alloy includes three steps. At the initial stage twinning dominates the plastic deformation and divides the coarse grains into finer twin platelets. With increasing strain, double twins and stacking faults form and a number of dislocation slip systems are activated, including basal plane systems, prismatic plane systems and pyramidal plane systems. As a result of the dislocation slip along these systems and of the cross slips, high-density dislocation arrays are formed which further subdivide the twin platelets into subgrains. Obvious evidence of dynamic recrystallization were identified within the high-strain-energy subgrains with a further increase of strain, leading to the formation of nano-sized grains in the surface layer.
Formatted abstract
By means of surface mechanical attrition treatment, nanometer-sized grains (with an average size of 30 ± 5 nm) were generated in the surface layer of a single-phase AZ91D alloy. Transmission electron microscopy investigations showed that the strain-induced grain refinement process in AZ91D alloy includes three steps. At the initial stage twinning dominates the plastic deformation and divides the coarse grains into finer twin platelets. With increasing strain, double twins and stacking faults form and a number of dislocation slip systems are activated, including basal plane systems, prismatic plane systems and pyramidal plane systems. As a result of the dislocation slip along these systems and of the cross slips, high-density dislocation arrays are formed which further subdivide the twin platelets into subgrains. Obvious evidence of dynamic recrystallization were identified within the high-strain-energy subgrains with a further increase of strain, leading to the formation of nano-sized grains in the surface layer.
© 2006 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
Keyword Materials Science, Multidisciplinary
Metallurgy & Metallurgical Engineering
Magnesium alloy
Grain refinement
Twinning
Dynamic recrystallization
SMAT
Mechanical attrition treatment
Dynamic recrystallization
Deformation behavior
Microstructure
Evolution
Superplasticity
Ductility
Metals
ECAP
Q-Index Code C1
Institutional Status UQ
Additional Notes Available online 28 November 2006

 
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Created: Tue, 19 Feb 2008, 03:11:05 EST