Abstract
The effects of 10–25 mass%Gd doping on the solidification microstructure, solute partitioning and material properties of the magnesium alloy AZ91D were investigated. AZ91D samples with 10–25 mass%Gd were solidified by a furnace cooling technique from 700 °C in an Ar flow. Microstructure observations showed that the Gd-doped alloys exhibit drastic structural changes to the αMg matrix with dispersed Al 2Gd particles. SEM-EDS analysis indicated that the mean Mg content in the αMg grains of AZ91D increased from 88.2 to 94.1 mass% by doping of 20 mass%Gd. The mean Al content in the αMg grains abruptly decreased to 1.2–1.9 mass% by doping 20 and 25 mass%Gd, compared to that of AZ91D of 7.9 mass%. The mean Gd content was 2.4–3.3 mass% in the AZ91D + 10–20 mass%Gd, though it abruptly increased to 11.6 mass% in the AZ91D + 25 mass%Gd. The thermal conductivity ( κ), measured by the laser-flash method at room temperature, showed a maximum for the AZ91D + 20 mass%Gd with a value of 129.2 W/mK, compared to a value of 45.1 W/mK for undoped AZ91D. The Vickers hardness increased monotonously with increasing Gd content from H V = 63.7 to 107.6. These results are discussed and related to the microstructure along with quantitative analysis.
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