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Enhanced superplasticity in a magnesium alloy processed by equal-channel angular pressing with a back-pressure

Lapovok, Rimma, Estrin, Yuri, Popov, Mikhail V. and Langdon, Terence G. 2008, Enhanced superplasticity in a magnesium alloy processed by equal-channel angular pressing with a back-pressure, Advanced engineering materials, vol. 10, no. 5, pp. 429-433, doi: 10.1002/adem.200700363.

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Title Enhanced superplasticity in a magnesium alloy processed by equal-channel angular pressing with a back-pressure
Author(s) Lapovok, Rimma
Estrin, Yuri
Popov, Mikhail V.
Langdon, Terence G.
Journal name Advanced engineering materials
Volume number 10
Issue number 5
Start page 429
End page 433
Total pages 5
Publisher Wiley
Place of publication Chichester, Eng.
Publication date 2008-05
ISSN 1438-1656
1527-2648
Keyword(s) superplastic formability
ECAP
grain structure
Summary An investigation was initiated to evaluate the feasibility of using equal-channel angular pressing (ECAP) to obtain high superplastic elongations in the AZ31 alloy with a back pressure producing a bimodal grain structure. Processing by ECAP was performed using a die with an angle of 90 ° between the two parts of the channel and a ram velocity of 15-20 mm/sec. Some pressing were conducted with a back-pressure by making use of a backward punch in the exit channel of the die. Molybdenum disulphide and a graphite spray were used as lubricants and billets were pressed using processing route B c in which each billet is rotated by 90 °. The pressing were conducted at temperatures in the range from 423 to 523 K and every billet was quenched in water after each pass. The significance of the bimodal microstructure is attributed to the ability of the larger grains to more easily accommodate grain boundary sliding through intragranular slip and twinning and to contribute to the strain hardening capability.
Language eng
DOI 10.1002/adem.200700363
Field of Research 091207 Metals and Alloy Materials
0912 Materials Engineering
Socio Economic Objective 970109 Expanding Knowledge in Engineering
HERDC Research category C1.1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2008, WILEY-VCH GmbH & Co.
Persistent URL http://hdl.handle.net/10536/DRO/DU:30076000

Document type: Journal Article
Collection: Institute for Frontier Materials
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