Precipitation of Al_3Sc in Al-0.23 mass%Sc Alloy
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Age hardening and precipitation processes in an Al-0.23 mass%Sc alloy were studied by the hardness test, electrical resistivity measurement and TEM observation. The stable and coherent Al<SUB>3</SUB>Sc phase of the L1<SUB>2</SUB> ordered structure precipitates directly from a supersaturated solid solution without forming any metastable phases. A plot of the cube of the particle radius against aging time follows a straight line, suggesting that the coarsening obeys the LSW theory of the diffusion controlled ripening process. The apparent activation energy for the precipitation of the Al<SUB>3</SUB>Sc phase determined by electrical resistivity change is 80 kJ/mol.
- MATERIALS TRANSACTIONS
MATERIALS TRANSACTIONS 38(10), 852-857, 1997-10
The Japan Institute of Metals