Developing High Strain Rate Superplasticity in Aluminum Alloys
|Periodical||Materials Science Forum (Volumes 475 - 479)|
|Edited by||Z.Y. Zhong, H. Saka, T.H. Kim, E.A. Holm, Y.F. Han and X.S. Xie|
|Citation||Cheng Xu et al., 2005, Materials Science Forum, 475-479, 2949|
|Online since||January, 2005|
|Authors||Cheng Xu, Minoru Furukawa, Zen Ji Horita, Terence G. Langdon|
|Keywords||Aluminum, Equal-Channel Angular Pressing (ECAP), Superplasticity|
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.