Developing High Strain Rate Superplasticity in Aluminum Alloys

Abstract:

The conventional materials used in superplastic forming operations generally have grain sizes of ~2 µm or larger and they exhibit superplasticity at relatively low strain rates. Processing by equal-channel angular pressing (ECAP) produces materials having ultrafine-grain sizes, usually in the submicrometer range. If these ultrafine grains show reasonable stability at elevated temperatures, the alloys may exhibit a capability for achieving superplastic elongations at high strain rates. This paper examines the development of ultrafine-grained structures and superplastic ductilities in a spray-cast aluminum 7034 alloys through ECAP. The results show that ECAP is a very effective procedure for achieving grain refinement and superplasticity at rapid strain rates.

• Periodical: Materials Science Forum (Volumes 475-479)
• Pages: 2949-2954
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.475-479.2949
• Online since: January 2005
• Authors: Cheng Xu, Minoru Furukawa, Z. Horita, Terence G. Langdon
• Keywords: Aluminum (Al), Equal-Channel Angular Pressing (ECAP), Superplasticity

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