TY - JOUR
T1 - Developing a superplastic forming capability in a commercial aluminum alloy without scandium or zirconium additions
AU - Lee, S.
AU - Furukawa, M.
AU - Horita, Z.
AU - Langdon, T. G.
N1 - Funding Information:
This work was supported in part by the Light Metals Educational Foundation of Japan, in part by the Japan Society for the Promotion of Science and in part by the US Army Research Office under grant no. DAAD19-00-1-0488.
PY - 2003/2/15
Y1 - 2003/2/15
N2 - Tests were undertaken to determine the feasibility of producing a superplastic forming capability in a commercial Al-2024 alloy through processing by equal-channel angular pressing (ECAP), where this alloy was selected because it contains no scandium or zirconium additions that are generally beneficial in retaining an array of small grains. Processing by ECAP produced grain sizes in the range from ∼ 0.3 to ∼ 0.5 μ and static annealing showed these ultrafine grains were reasonably stable at temperatures up to ∼ 700 K. Superplastic elongations were achieved after ECAP with a maximum elongation of ∼ 500% at 673 K when using a strain rate of 1.0 × 10-2 s-1. The strain rate sensitivity was measured as ∼ 0.3 suggesting that dislocation glide is the rate-controlling mechanism. These results demonstrate the potential for achieving high tensile ductilities in conventional commercial aluminum alloys through processing by ECAP.
AB - Tests were undertaken to determine the feasibility of producing a superplastic forming capability in a commercial Al-2024 alloy through processing by equal-channel angular pressing (ECAP), where this alloy was selected because it contains no scandium or zirconium additions that are generally beneficial in retaining an array of small grains. Processing by ECAP produced grain sizes in the range from ∼ 0.3 to ∼ 0.5 μ and static annealing showed these ultrafine grains were reasonably stable at temperatures up to ∼ 700 K. Superplastic elongations were achieved after ECAP with a maximum elongation of ∼ 500% at 673 K when using a strain rate of 1.0 × 10-2 s-1. The strain rate sensitivity was measured as ∼ 0.3 suggesting that dislocation glide is the rate-controlling mechanism. These results demonstrate the potential for achieving high tensile ductilities in conventional commercial aluminum alloys through processing by ECAP.
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U2 - 10.1016/S0921-5093(02)00319-2
DO - 10.1016/S0921-5093(02)00319-2
M3 - Article
AN - SCOPUS:0037440622
SN - 0921-5093
VL - 342
SP - 294
EP - 301
JO - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
JF - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
IS - 1-2
ER -