An examination of the deformation process in equal-channel angular pressing

Conference · Sat Jul 01 04:00:00 EDT 2000

OSTI ID:20104692

Berbon, P B; Furukawa, Minoru; Horita, Zenji; Nemoto, Minoru; Langdon, T G

In the past decade, there has been an important emphasis in materials science on the production and use of ultrafine-grained materials. These materials offer wide-ranging advantages such as an improvement in strength at low temperatures and enhanced superplastic behavior at high temperatures. New techniques to process these materials have been developed. Good properties have been achieved by powder metallurgy and by techniques of bulk processing. Equal-channel angular (ECA) pressing is a bulk-processing technique which has led to some remarkable achievements in the production of sub-microcrystalline materials with excellent superplastic properties at low temperatures and high strain rates. When considering the currently available physical and mechanical properties of these materials, it appears that some aspects cannot be explained solely by the very small grain size. In fact, the specific mode of deformation occurring in ECA pressing appears to have an influence on the final properties. This paper reviews the details of this metal working technique and then provides an explanation for the observed microstructures, their thermal stability and their remarkable superplastic properties.

• Research Organization: Rockwell Science Center, Thousand Oaks, CA (US)
• Sponsoring Organization: Light Metals Educational Foundation of Japan; US National Science Foundation
• OSTI ID: 20104692
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM BASE ALLOYS
DEFORMATION
EXPERIMENTAL DATA
GRAIN SIZE
MATERIALS WORKING
PLASTICITY