Abstract
The liquidus and solidus curves of the pseudobinary system have been determined by thermal analysis of cooling and heating curves, respectively, for homogenized liquid and solid alloy samples. The phase diagram has a eutectic point at . Above the eutectic composition both liquidus and solidus temperatures increase monotonically and sublinearly with increasing content. In this region the experimental values of the liquidus‐solidus gap do not exceed 11 m/o and are in excellent agreement with the ideal thermodynamic liquidus‐solidus relationship. The phase diagram below the solidus has been investigated by x‐ray diffraction measurements on alloy powders annealed between 770° and 1050°C and quenched. It consists of two broad single‐phase regions, one of alloys with the zinc blende structure of and the other of alloys with the wurtzite structure of , separated by a two‐phase region only about 3 m/o wide, whose boundaries shift toward increasing content with decreasing temperature. For compositions between 30 and 45 m/o , either structure could be obtained at room temperature, depending on annealing temperature and rate of cooling. In addition, a polytype of unknown structure, which appears to be a metastable intermediate in the wurtzite‐to‐zinc blende transformation, was observed in two melt‐grown furnace‐cooled ingots containing 45–50 m/o .
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