In their use as a kinetic energy penetrator material, ever increasing demands are placed upon the properties required from tungsten heavy alloys In order to make advances in the metallurgy of these materials and so keep pace with these requirements, it is necessary to gain a fundamental understanding of the microstructural characteristics of the alloys and the relationship with processing history This paper focuses on two tungsten-nickel-iron alloys (containing 92.5% and 95% tungsten by weight) which have been mechanically deformed up to ～70% reduction in area and "aged" at temperatures between 500°C and 1100°C. The alloys have been characterised with respect to tungsten grain size, axial ratio, contiguity, hardness and fracture morphology Where possible these features have been related back to the processing history.
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