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Monte Carlo simulation techniques are used to investigate clustering and phase separation in a binary alloy of equimolar composition (AB) on a face-centred cubic lattice with 6912 sites. The formation of spanning paths and connected clusters of B atoms is studied as a function of the reduced inverse temperature x ( = A c / k T ) , where A& measures the difference in the interaction energy between unlike and like nearest-neighbour (NN) pairs of atoms. A further generalisation is introduced into the model in the form of a minimumvalence restriction, so only those B atomssurrounded by at least m NN B atoms are considered in the analysis. Values of m in the range 0 to 10 are treated.

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