Microstructure Instability in Cryogenically-Deformed Copper (Preprint)
Abstract
There is considerable interest in the potential use of cryogenic deformation for the production of nanocrystalline materials. It is believed that low homologous temperatures may suppress dynamic recovery and stimulate mechanical twinning, thus enhancing the refinement of grain size. The subsequent ambient-temperature stability of the microstructures thus produced is an important consideration with regard to practical use of such processing approaches. For example, primary recrystallization during static storage at room temperature has been observed in cryogenically-rolled copper. This unusual phenomenon was hypothesized to be associated with a high density of vacancies in the cryo-deformed material giving rise to the exceptionally high grain-boundary mobility. It may also be conjectured that such instabilities may be exacerbated with an increase in the imposed cryogenic strain such as is common during severe plastic deformation. The objective of the present work was to quantify in more detail such microstructural instability.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 2011
- Accession Number
- ADA548068
Entities
People
- A. Korznikov
- S. Mironov
- Sheldon Lee Semiatin
- T. Konkova
Organizations
- Air Force Research Laboratory