PRODUCTION OF METALLIC ARTICLES

摘要

Alloys having a composition suitable for superplastic deformation ussually require heat treatment after casting and mechanical working in order to produce in the alloy the necessary fineness of grain structure to permit such deformation to occur. It has now been found that some such alloys including in particular ranged of aluminium alloys containing zirconium (or Nb, Ta or Ni) may be heated to a superplastic forming temperature and non-superylastically deformed at that temperature to induce dynamic recrystallisation and simultaneously produce a fine recrystallised grain structure and superplastic deformation.