Factors affecting superplastic ductility and elongation

C. H. Hamilton, K. Kannan, M. A. Khaleel, M. T. Smith, J. S. Vetrano

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)


Superplastic ductility, while known to be strongly related to the strain rate sensitive m, is difficult to predict and many times can be difficult to understand. Cavitation is most often indicated as the cause of a lower than expected elongation; however, this consideration has not always explained the variation in ductility observed, such as a significant scatter in elongations measured for the same material and under the same test conditions. The range of factors which may be involved are suggested here to include initial gradients, or inhomogeneities, in such factors as cavitation, temperature, grain size as well as geometry (i.e. area, stress, or stress state). A model is summarized which constructs the tensile test section of a number of elements, each allowing a different initial condition as well subsequent evolution. The model is applied to cavitation variations with supporting evidence from controlled experiment on the superplastic Pb-Sn alloy which had various patterns of pre-machined holes throughout the test section. Also, the potential effect of dynamic recrystallization is explored with the model, and which suggests that a substantial loss in ductility can result.

Original languageEnglish
Title of host publicationTMS Annual Meeting
Place of PublicationWarrendale, PA, United States
PublisherMinerals, Metals & Materials Soc (TMS)
Number of pages10
Publication statusPublished - 1 Jan 1998
Externally publishedYes
EventProceedings of the 1998 TMS Annual Meeting - San Antonio, TX, USA
Duration: 15 Feb 199819 Feb 1998


OtherProceedings of the 1998 TMS Annual Meeting
CitySan Antonio, TX, USA


ASJC Scopus subject areas

  • Geology
  • Metals and Alloys

Cite this

Hamilton, C. H., Kannan, K., Khaleel, M. A., Smith, M. T., & Vetrano, J. S. (1998). Factors affecting superplastic ductility and elongation. In TMS Annual Meeting (pp. 43-52). Minerals, Metals & Materials Soc (TMS).