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Particle evolution in Mg-Zn-Zr alloy processed by integrated extrusion and equal channel angular pressing : Evaluation by electron microscopy and synchrotron small-angle X-ray scattering

Orlov, Dmitry; Pelliccia, Daniele; Fang, Xiya; Bourgeois, Laure; Kirby, Nigel; Nikulin, Andrei Y.; Ameyama, Kei and Estrin, Yuri (2014) In Acta Materialia 72. p.110-124
Abstract

The evolution of intermetallic precipitate particles in Mg-Zn-Zr alloy ZK60 during thermomechanical processing by integrated extrusion and equal channel angular pressing was investigated in detail. Electron microscopy was employed to analyse individual particles and their orientation within the Mg matrix, while small-angle X-ray scattering (SAXS) was used for an assessment of global particle behaviour and statistical significance of their volume in the microstructure. A significant redistribution of prismatic rod-type and basal platelet-type precipitates, as well as their resolutioning followed by the formation of prismatic platelets, was found. The platelet-type precipitates lying on prismatic {21̄1̄0}α planes were hitherto... (More)

The evolution of intermetallic precipitate particles in Mg-Zn-Zr alloy ZK60 during thermomechanical processing by integrated extrusion and equal channel angular pressing was investigated in detail. Electron microscopy was employed to analyse individual particles and their orientation within the Mg matrix, while small-angle X-ray scattering (SAXS) was used for an assessment of global particle behaviour and statistical significance of their volume in the microstructure. A significant redistribution of prismatic rod-type and basal platelet-type precipitates, as well as their resolutioning followed by the formation of prismatic platelets, was found. The platelet-type precipitates lying on prismatic {21̄1̄0}α planes were hitherto unknown for the Mg-Zn-Zr system. These precipitates were present in a statistically significant amount detectable by SAXS. Such precipitates should favour an increase of critical resolved shear stress for basal slip in the Mg matrix, thus contributing to an improved performance of the Mg-Zn-Zr alloy. The possibility of formation of prismatic platelet-type precipitates in Mg alloys proven in this paper opens up a new avenue for the design of relatively inexpensive high-performance magnesium alloys.

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author
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Intermetallic particles, Magnesium, Severe plastic deformation, Small-angle X-ray scattering, TEM
in
Acta Materialia
volume
72
pages
15 pages
publisher
Elsevier
external identifiers
  • scopus:84898823948
ISSN
1359-6454
DOI
10.1016/j.actamat.2014.03.027
language
English
LU publication?
no
id
e4d279d7-62a3-4a49-aacd-168b23c10b6a
date added to LUP
2016-06-20 15:32:40
date last changed
2017-10-22 05:16:39
@article{e4d279d7-62a3-4a49-aacd-168b23c10b6a,
  abstract     = {<p>The evolution of intermetallic precipitate particles in Mg-Zn-Zr alloy ZK60 during thermomechanical processing by integrated extrusion and equal channel angular pressing was investigated in detail. Electron microscopy was employed to analyse individual particles and their orientation within the Mg matrix, while small-angle X-ray scattering (SAXS) was used for an assessment of global particle behaviour and statistical significance of their volume in the microstructure. A significant redistribution of prismatic rod-type and basal platelet-type precipitates, as well as their resolutioning followed by the formation of prismatic platelets, was found. The platelet-type precipitates lying on prismatic {<sub>21̄1̄0}α</sub> planes were hitherto unknown for the Mg-Zn-Zr system. These precipitates were present in a statistically significant amount detectable by SAXS. Such precipitates should favour an increase of critical resolved shear stress for basal slip in the Mg matrix, thus contributing to an improved performance of the Mg-Zn-Zr alloy. The possibility of formation of prismatic platelet-type precipitates in Mg alloys proven in this paper opens up a new avenue for the design of relatively inexpensive high-performance magnesium alloys.</p>},
  author       = {Orlov, Dmitry and Pelliccia, Daniele and Fang, Xiya and Bourgeois, Laure and Kirby, Nigel and Nikulin, Andrei Y. and Ameyama, Kei and Estrin, Yuri},
  issn         = {1359-6454},
  keyword      = {Intermetallic particles,Magnesium,Severe plastic deformation,Small-angle X-ray scattering,TEM},
  language     = {eng},
  month        = {06},
  pages        = {110--124},
  publisher    = {Elsevier},
  series       = {Acta Materialia},
  title        = {Particle evolution in Mg-Zn-Zr alloy processed by integrated extrusion and equal channel angular pressing : Evaluation by electron microscopy and synchrotron small-angle X-ray scattering},
  url          = {http://dx.doi.org/10.1016/j.actamat.2014.03.027},
  volume       = {72},
  year         = {2014},
}