Abstract
The variations in strength and ductility characteristics during industrial working of dispersion-strengthened molybdenum and tungsten alloys are described. With progressive working the ductile-brittle transition is decreased. Both strength and fracture elongation increase, in contrast to the usually observed inverse relation between these two properties. This is explained by the beneficial effects of dynamic strain aging which operates while the ingot is deformed at certain critical temperatures. However, such a twofold improvement is not observed in all alloys. It is not possible when the dispersates cannot dissociate; then, the alloying elements are not dissolved in the matrix and are not available for initiating dynamic strain aging, nor may the fracture elongation improve when extensive static age hardening is superimposed.
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