Journal
METALS AND MATERIALS INTERNATIONAL
Volume 21, Issue 3, Pages 429-439Publisher
KOREAN INST METALS MATERIALS
DOI: 10.1007/s12540-015-4499-2
Keywords
solidification; microstructure; intermetallic; indentation; alloys
Funding
- IFPA (Federal Institute of Education, Science and Technology of Para)
- UFPA (Federal University of Para)
- CAPES (Coordination of Superior Level Staff Improvement)
- CNPq (the Brazilian Research Council), Brazil
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In this work, the effect of the growth rate (V-L) and cooling rate (T-R), primary dendritic arm spacing (lambda(1)) and Al2Cu intermetallic phase on the microhardness was investigated during transient horizontal directional solidification of A1-3wt%Cu and A1-8wt%Cu alloys. Microstructural characterization of the investigated alloys was performed using traditional techniques of metallography, optical and SEM microscopy and X-Ray diffraction. The microhardness evolution as a function of the thermal and microstructural parameters (V-L, T-R, and lambda(1)) was evaluated using power and Hall-Petch type experimental laws, which were compared with other laws in the literature. In order to examine the effect of the Al2Cu intermetallic phase, microhardness measurements were performed in interdendritic regions. Finally, a comparative analysis was performed between the experimental data of this work and theoretical models from the literature that have been proposed to predict primary dendrite arm spacing, which have been tested in numerous works considering upward directional solidification.
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