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Improvement of mechanical properties of magnesium alloy ZK60 by integrated extrusion and equal channel angular pressing

Orlov, Dmitry; Raab, George; Lamark, Torbjorn T.; Popov, Mikhail and Estrin, Yuri (2011) In Acta Materialia 59(1). p.375-385
Abstract

The paper demonstrates the feasibility of upscaling of severe plastic deformation (SPD) techniques using an integrated process that combines conventional extrusion and equal channel angular pressing in a single processing step. The process was applied for production of magnesium ZK60 bars 16 mm in diameter and up to 4 m in length. The processed material exhibited an excellent balance of strength and tensile ductility. It had a yield strength of 310 MPa and the ultimate tensile strength of 351 MPa. The total elongation of 17.1% was about 2.5 times and the reduction in area of 42.5% was more than 10 times larger than the corresponding values in the as-received condition. A transition from brittle to ductile fracture suggesting a change in... (More)

The paper demonstrates the feasibility of upscaling of severe plastic deformation (SPD) techniques using an integrated process that combines conventional extrusion and equal channel angular pressing in a single processing step. The process was applied for production of magnesium ZK60 bars 16 mm in diameter and up to 4 m in length. The processed material exhibited an excellent balance of strength and tensile ductility. It had a yield strength of 310 MPa and the ultimate tensile strength of 351 MPa. The total elongation of 17.1% was about 2.5 times and the reduction in area of 42.5% was more than 10 times larger than the corresponding values in the as-received condition. A transition from brittle to ductile fracture suggesting a change in the deformation mechanisms was also found in the material processed by the integrated SPD technique. Analysis of microstructure and texture of the SPD-processed bars showed that this excellent combination of strength and ductility can be attributed to the synergy of fine-grained microstructure and favorable texture promoting basal slip (in concert with non-basal slip), yet not to an extent that strength is sacrificed. The possibility to produce long bars of ZK60 with exceptionally good mechanical properties in a "semi-continuous" process is a promising opportunity for the transfer of severe plastic deformation processing to industrial manufacturing scale.

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author
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Equal channel angular pressing, Extrusion, Magnesium alloys, Mechanical properties, Microstructure
in
Acta Materialia
volume
59
issue
1
pages
11 pages
publisher
Elsevier
external identifiers
  • scopus:78049527034
ISSN
1359-6454
DOI
10.1016/j.actamat.2010.09.043
language
English
LU publication?
no
id
a7623efb-5f97-4239-bd3d-a32b315dc76c
date added to LUP
2016-06-20 15:38:30
date last changed
2017-10-01 05:20:44
@article{a7623efb-5f97-4239-bd3d-a32b315dc76c,
  abstract     = {<p>The paper demonstrates the feasibility of upscaling of severe plastic deformation (SPD) techniques using an integrated process that combines conventional extrusion and equal channel angular pressing in a single processing step. The process was applied for production of magnesium ZK60 bars 16 mm in diameter and up to 4 m in length. The processed material exhibited an excellent balance of strength and tensile ductility. It had a yield strength of 310 MPa and the ultimate tensile strength of 351 MPa. The total elongation of 17.1% was about 2.5 times and the reduction in area of 42.5% was more than 10 times larger than the corresponding values in the as-received condition. A transition from brittle to ductile fracture suggesting a change in the deformation mechanisms was also found in the material processed by the integrated SPD technique. Analysis of microstructure and texture of the SPD-processed bars showed that this excellent combination of strength and ductility can be attributed to the synergy of fine-grained microstructure and favorable texture promoting basal slip (in concert with non-basal slip), yet not to an extent that strength is sacrificed. The possibility to produce long bars of ZK60 with exceptionally good mechanical properties in a "semi-continuous" process is a promising opportunity for the transfer of severe plastic deformation processing to industrial manufacturing scale.</p>},
  author       = {Orlov, Dmitry and Raab, George and Lamark, Torbjorn T. and Popov, Mikhail and Estrin, Yuri},
  issn         = {1359-6454},
  keyword      = {Equal channel angular pressing,Extrusion,Magnesium alloys,Mechanical properties,Microstructure},
  language     = {eng},
  number       = {1},
  pages        = {375--385},
  publisher    = {Elsevier},
  series       = {Acta Materialia},
  title        = {Improvement of mechanical properties of magnesium alloy ZK60 by integrated extrusion and equal channel angular pressing},
  url          = {http://dx.doi.org/10.1016/j.actamat.2010.09.043},
  volume       = {59},
  year         = {2011},
}