Development of Microstructure in Silicon-Aluminum-Bronze

J. Iqbal, F. Ahmed, F. Hasan


The aim of present study was to determine the sequence of micro-structural development during continuous cooling from temperatures approaching the solidus, in an as cast silicon- aluminum bronze alloy having composition Cu-6 % Al-2% Si-0.6% Fe. This alloy has good resistance to seawater corrosion and low magnetic permeability. This alloy is used in marine and chemical applications where corrosion resistance is a prime requirement. A study of the development of microstructure during continuous cooling from the solidus temperature showed that at high temperatures the alloy consisted of β and α phases in which the α-phase had a Widmanstatten morphology. As the temperature is lowered Fe5Si3 particles formed throughout the microstructure and this is followed by the formation of Fe3Si2 precipitates in the α-grains. On further cooling the β phase is transformed into γ2

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