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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 Pravdic
A 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.

History

Journal

Materials science forum

Volume

539

Issue

543

Pagination

1729 - 1734

Publisher

Trans Tech Publications

Location

Aedermannsdorf, Switzerland

ISSN

0255-5476

Language

eng

Publication classification

C1 Refereed article in a scholarly journal

Copyright notice

2007, Trans Tech Publications

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