Dissemination of IT for the Promotion of Materials Science (DoITPoMS)

DoITPoMS Micrograph Library Full Record for Micrograph 730

Full Record for Micrograph 730

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Micrograph no
730
Brief description
Magnesium alloy
Keywords
magnesium
Categories
Metal or alloy
System
Mg-Zn
Composition
Mg 94.05, Zn 5.62, Zr 0.19, Ce 0.10, Nd 0.03 (wt%) (RZ5 Alloy)
Standard codes
Reaction
Processing
As cast
Applications
RZ5 magnesium alloy is commonly used for wheels in both Formula One and Superbike competitions because of its high strength to weight ratio.
Sample preparation
Standard polishing techniques
Technique
Scanning electron microscopy (SEM) in backscattered electron imaging (BEI) mode
Length bar
200 μm
Further information
This RZ5 alloy is from an actual cast specimen. The billet was approximately 75mm diameter by 100mm in length. The cast billet has a characteristically rough surface, associated with the grain size of the sand used in the mould. This interaction between the cool mould and the hot casting, has an important role to play in the microstructure that develops throughout the billet. The microstructure varies as progression is made from the edge of the billet to the centre. The grains are approximately 200mm equiaxed. The grain boundary phase that is present is mainly composed of zinc and the rare earth elements and becomes sparser as the edge of the billet is approached.
Contributor
R J Mitchell
Organisation
Department of Engineering, University of Leicester
Date
05/03/03
Licence for re-use
Attribution-Non-Commercial-Share Alike 2.0 UK: England & Wales
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