Mechanical Properties of Alumina Particle/Al-4.5mass%Cu Alloy Composites Fabricated by Transient Liquid Phase Sintering(Materials, Metallurgy & Weldability)
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Preparation of Al_2O_3 particle/Al-4.5%Cu alloy composites was attempted by transient liquid phase (TLP) sintering. Al-4.5%Cu alloy was selected as the matrix phase for the TLP sintering, because it has the basic composition of durdumin. As a result, in case of Al-4.5%Cu mixed powder, the microstructure after TLP sintering was composed of α-Al solid solution and CuAl_2 (θ-phase) for any condtion. In addition, the microstructure had Cu-poor phases in the vicinity of grain boundaries of α-Al solid solution. The morphology of the θ-phase formed at the grain boundary in the solid state sintered alloy was more continuous than in the TLP sintered alloy. The mechanical properties of the TLP sintered alloy were superior to the solid state sintered alloy. It was proved that the morphology of the θ-Phase formed at the grain boundary influenced the mechanical properties. Effects of Al_2O_3vol% on the sintering characteristics of the Al_2O_3 particle/Al-4.5%Cu alloy composites were examined. The mechanical properties of the TLP sintered composites were superior to those of the solid state sintered composites. It is clear that the bond strength between Al_2O_3 and the matrix plays an important role in the tensile strength of TLP sintered composites. It is also apparent that sintering processes of Al_2O_3/Al/4.5%Cu mixed powder were accelerated by TLP sintering.
- Transactions of JWRI
Transactions of JWRI 27 (1), 41-45, 1998-07