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Microstructure of In‐Situ composites
Author(s) -
ElMahallawy N. A.,
AbdelLatif M. H.,
Taha M. A.
Publication year - 1983
Publication title -
materialwissenschaft und werkstofftechnik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.285
H-Index - 38
eISSN - 1521-4052
pISSN - 0933-5137
DOI - 10.1002/mawe.19830140407
Subject(s) - microstructure , materials science , eutectic system , alloy , lamellar structure , composite material , isothermal process , superalloy , annealing (glass) , thermal stability , metallurgy , thermodynamics , chemical engineering , physics , engineering
In this paper, the results of several years of research work by the authors on the microstructure of In‐Situ composites are reviewed. Alloy systems investigated are the fibrous AlNi and cobalt‐base superalloy CoCrC, and the lamellar AlCu and CoW. The effect of solidification variables and off‐eutectic compositions on the micro‐structure of AlNi CoW and AlCu systems was studied. The influence of heat flow direction on the microstructure of AlNi was examined. Post solidification isothermal annealing was performed for AlCu and CoCrC alloy and thermal cycling regimes were imposed on the CoCrC alloy and the microstructure variations were examined. Computer simulation of directional, solidification to study the heat flow pattern in the metal and mould was also performed. It was found that low growth rates, high temperature gradients, eutectic composition and pure materials favor a planar solidification front and an aligned structure. Increasing the growth rate resulted in finer structures. The thermal stability of In‐Situ composites was found to be reasonably good due to the strong interfacial bond between matrix and reinforcement in this class of composites.