Abstract
The ordered b.c.t. D0 22-type intermetallic compound Al 3Ta is difficult to fabricate homogeneously via conventional alloying methods owing to the different physical properties (density and melting and boiling points) of the component elements. Three powder metallurgy methods were used, and hot isostatic pressing is found to be a good means of fabricating the compound from powder mixtures of the elements, aluminum and tantalum. Hot isostatically pressed powders became almost a single-phase D0 22-type compound of Al 3Ta with a small fraction of a second phase formed incoherently inside the grains. The compound fractured at room temperature revealed a cleavage transgranular mode in regions where the grain size is large and an intergranular mode in regions where it is smaller than around 2 μm. The compound slightly deformed at room temperature showed perfect superlattice dislocations lying on (111) f.c.c. whose Burgers vectors are of the [1 1 0] and 1 2 [ 1 12] types.
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