The Intergranular Microstructure of Magnesium Based Die-Cast AE Alloys

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The Intergranular Microstructure of Magnesium Based Die-Cast AE Alloys

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Publication Conference Paper, peer reviewed
Title The Intergranular Microstructure of Magnesium Based Die-Cast AE Alloys
Author(s) Wei, Kun ; Wei, Liu-Ying ; Warren, Richard
Date 2009
Editor(s) Nyberg, Eric A
English abstract
A systematic investigation on microstructures of magnesium based die-cast Mg-Al-RE alloys (AE alloys) has been performed by XRD, SEM and TEM. The alloys are with content of Al around 4wt% and various content of rare earth (RE). Samples of these alloys are in as-cast condition as well as in aged condition at 200°C and 250°C. The intergranular microstructure of the alloys has been studied in details. Three type binary Al-RE phases were found intergranularly. Al11RE3 is predominant intergranular phase in the as cast alloys. Al3RE particles and small amount of Al2RE phase were found in alloys with high RE content. Thermal stability of the Al-RE phases in AE alloys was suggested to decrease in sequence: Al2RE→ Al11RE3 →Al3RE. The Al/RE ratio of the die cast alloys determined their phase constitutions. Promising AE alloys for creep resistance is suggested to have an Al/RE ratio not higher than 1.8.
Publisher The Minerals, Metals & Materials Society (TMS)
Host/Issue Magnesium Technology 2009
ISBN 9780873397308
Pages 261-266
Language eng (iso)
Subject(s) AE alloys
intergranular microstructure
Al2RE
Al3RE
TEM
Technology
Research Subject Categories::TECHNOLOGY::Materials science
Note TMS 138th Annual Meeting & Exhibition, Feb. 15-19 2009, San Francisco, USA
Handle http://hdl.handle.net/2043/9518 (link to this page)
Link http://www.tms.org/Meetings/Annual-09/AM09home.aspx (external link to related web page)

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