초록 ▼

Alloys having a composition suitable for superplastic deformation usually require heat treatment after casting and mechanical working in order to produce in the alloy the necessary fineness of grain stucture to permit such deformation to occur. It has now been found that some such alloys including i

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

대표청구항 ▼

A method of producing simultaneously a fine recrystallised grain structure in a metallic alloy having a composition suitable for superplastic deformation but having a grain structure which precludes such deformation and of forming an article from said alloy by superplastic deformation comprising rai

A method of producing simultaneously a fine recrystallised grain structure in a metallic alloy having a composition suitable for superplastic deformation but having a grain structure which precludes such deformation and of forming an article from said alloy by superplastic deformation comprising raising a blank of the alloy to a forming temperature, applying a force to the blank at said temperature to deform the blank non-superplastically and induce dynamic strain recrystallisation and continuing the application of said force so that said fine recrystallised grain structure is progressively developed and the partly formed blank is superplastically deformed to form the article.