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Title: Microstructure characterization of LAE442 magnesium alloy processed by extrusion and ECAP

Abstract

The magnesium alloy LAE442 was processed by extrusion and equal channel angular pressing (ECAP) to achieve ultrafine grained microstructure. Detailed characterization of the microstructure was performed by scanning electron microscope, electron back scattered diffraction (EBSD) and transmission electron microscope. The initial, as-cast, microstructure consisted of large grains of ~ 1 mm. The grain refinement due to the processing by severe plastic deformation led to a decrease of the average grain size to ~ 1.7 μm after the final step of ECAP. A detailed characterization of secondary phases showed the precipitation of Al{sub 11}RE{sub 3}, Al{sub 2}Ca and Al{sub 10}RE{sub 2}Mn{sub 7} intermetallic phases. X-ray diffraction measurements proved that Li is dissolved within the magnesium matrix in the as-cast condition. Newly formed Al{sub 3}Li phase was observed after ECAP. The texture formation due to the extrusion and ECAP was different from that in the other magnesium alloys due to the activation of non-basal slip systems as a result of the decrease of the c/a ratio. - Highlights: • Combined extrusion and equal channel angular pressing results in significant grain refinement by factor 1000 approximately. • Al{sub 11}RE{sub 3}, Al{sub 2}Ca and Al{sub 10}RE{sub 2}Mn{sub 7} secondary phases are present in themore » as-cast material while Li was dissolved in the Mg matrix. • Extrusion and ECAP have no effect on the composition of the secondary phases but they influence strongly their distribution. • Texture evolution is affected by decrease of c/a ratio due to the presence of Li and resulting activation of non-basal slip.« less

Authors:
; ;  [1];  [2];  [1]
  1. Charles University, Department of Physics of Materials, Prague (Czech Republic)
  2. Charles University, Department Condensed Matter Physics, Prague (Czech Republic)
Publication Date:
OSTI Identifier:
22587089
Resource Type:
Journal Article
Journal Name:
Materials Characterization
Additional Journal Information:
Journal Volume: 112; Other Information: Copyright (c) 2015 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1044-5803
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 77 NANOSCIENCE AND NANOTECHNOLOGY; BACKSCATTERING; ELECTRON DIFFRACTION; EXTRUSION; GRAIN REFINEMENT; GRAIN SIZE; MAGNESIUM; MAGNESIUM ALLOYS; PRESSING; SCANNING ELECTRON MICROSCOPY; TRANSMISSION ELECTRON MICROSCOPY; X-RAY DIFFRACTION

Citation Formats

Minárik, Peter, Král, Robert, Pešička, Josef, Daniš, Stanislav, and Janeček, Miloš. Microstructure characterization of LAE442 magnesium alloy processed by extrusion and ECAP. United States: N. p., 2016. Web. doi:10.1016/J.MATCHAR.2015.12.002.
Minárik, Peter, Král, Robert, Pešička, Josef, Daniš, Stanislav, & Janeček, Miloš. Microstructure characterization of LAE442 magnesium alloy processed by extrusion and ECAP. United States. doi:10.1016/J.MATCHAR.2015.12.002.
Minárik, Peter, Král, Robert, Pešička, Josef, Daniš, Stanislav, and Janeček, Miloš. Mon . "Microstructure characterization of LAE442 magnesium alloy processed by extrusion and ECAP". United States. doi:10.1016/J.MATCHAR.2015.12.002.
@article{osti_22587089,
title = {Microstructure characterization of LAE442 magnesium alloy processed by extrusion and ECAP},
author = {Minárik, Peter and Král, Robert and Pešička, Josef and Daniš, Stanislav and Janeček, Miloš},
abstractNote = {The magnesium alloy LAE442 was processed by extrusion and equal channel angular pressing (ECAP) to achieve ultrafine grained microstructure. Detailed characterization of the microstructure was performed by scanning electron microscope, electron back scattered diffraction (EBSD) and transmission electron microscope. The initial, as-cast, microstructure consisted of large grains of ~ 1 mm. The grain refinement due to the processing by severe plastic deformation led to a decrease of the average grain size to ~ 1.7 μm after the final step of ECAP. A detailed characterization of secondary phases showed the precipitation of Al{sub 11}RE{sub 3}, Al{sub 2}Ca and Al{sub 10}RE{sub 2}Mn{sub 7} intermetallic phases. X-ray diffraction measurements proved that Li is dissolved within the magnesium matrix in the as-cast condition. Newly formed Al{sub 3}Li phase was observed after ECAP. The texture formation due to the extrusion and ECAP was different from that in the other magnesium alloys due to the activation of non-basal slip systems as a result of the decrease of the c/a ratio. - Highlights: • Combined extrusion and equal channel angular pressing results in significant grain refinement by factor 1000 approximately. • Al{sub 11}RE{sub 3}, Al{sub 2}Ca and Al{sub 10}RE{sub 2}Mn{sub 7} secondary phases are present in the as-cast material while Li was dissolved in the Mg matrix. • Extrusion and ECAP have no effect on the composition of the secondary phases but they influence strongly their distribution. • Texture evolution is affected by decrease of c/a ratio due to the presence of Li and resulting activation of non-basal slip.},
doi = {10.1016/J.MATCHAR.2015.12.002},
journal = {Materials Characterization},
issn = {1044-5803},
number = ,
volume = 112,
place = {United States},
year = {2016},
month = {2}
}