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Enhanced superplasticity in a magnesium alloy processed by equal-channel angular pressing with a back-pressure
journal contribution
posted on 2008-05-01, 00:00 authored by Rimma LapovokRimma Lapovok, Y Estrin, M V Popov, T G LangdonAn 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.
History
Journal
Advanced engineering materialsVolume
10Issue
5Pagination
429 - 433Publisher
WileyLocation
Chichester, Eng.Publisher DOI
ISSN
1438-1656eISSN
1527-2648Language
engPublication classification
C Journal article; C1.1 Refereed article in a scholarly journalCopyright notice
2008, WILEY-VCH GmbH & Co.Usage metrics
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