Conference paper
Microstructure of Magnesium alloy AZ91-HP cast in permanent and non-permanent moulds
Casting of different geometries were made with AZ91-HP in different moulding media, so that a range of cooling conditions were obtained. Cooling curves were measured and compared to the microstructures found in the castings. It was shown that segregation in the alloy is highly dependent on cooling rate.
This leads to precipitation of varying amounts of intermetallic phases. The distribution of phases in the material is controlled both by interdendritic and intergranular segregation, leading to an inhomogeneous microstructure. It is shown that local solidification time, segregation and diffusion in the material interact in a complex manner making segregation and inhomogenity very difficult to avoid.
Language: | English |
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Publisher: | Normac |
Year: | 2003 |
Proceedings: | Normac's 2'nd international magnesium Conference & Exhibition |
Types: | Conference paper |
ORCIDs: | Tiedje, Niels |