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| · The alloy shown has a composition of Pb-10 w% Sn. In cooling from the liquid state it first enters the a + L two-phase zone, but reaches the solvus line before attaining the eutectic temperature. The a-phase undergoes a solid state separation into a and b solid solutions. Their ratio is determined by the lever rule in the two phase region. The diagram assumes homogeneous nucleation in a single crystal a-phase. | |||||