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Effect of solidification grain refinement on the development of wrought Mg alloys
journal contribution
posted on 2007-01-01, 00:00 authored by M Easton, C Davies, Matthew BarnettMatthew Barnett, F PravdicA recent trial investigated the effect of solidification grain refinement of billet on the grain refinement and properties of alloy ZM20. It was found that even at levels of 0.4Mn, significant grain refinement could be obtained when 0.7Zr was added. At 0.2Mn grain sizes as low as 60μm were
obtained. Billets of Mg-2Zn-0.2Mn with four different grain sizes, due to different Zr and cooling rates were then cast via vertical direct chill casting and extruded conventionally. Benefits of grain refinement of the billet on extrusion were found to be a slight increase in the size of the operating
window, and a reduction of the grain size in the extrudate. However, the effect of the reduction in extrudate grain size due to refinement of the billet was small compared with the amount of grain refinement obtained due to recrystallisation on extrusion.
obtained. Billets of Mg-2Zn-0.2Mn with four different grain sizes, due to different Zr and cooling rates were then cast via vertical direct chill casting and extruded conventionally. Benefits of grain refinement of the billet on extrusion were found to be a slight increase in the size of the operating
window, and a reduction of the grain size in the extrudate. However, the effect of the reduction in extrudate grain size due to refinement of the billet was small compared with the amount of grain refinement obtained due to recrystallisation on extrusion.
History
Journal
Materials science forumVolume
539Issue
543Pagination
1729 - 1734Publisher
Trans Tech PublicationsLocation
Aedermannsdorf, SwitzerlandISSN
0255-5476Language
engPublication classification
C1 Refereed article in a scholarly journalCopyright notice
2007, Trans Tech PublicationsUsage metrics
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