TY - JOUR
T1 - An evaluation of the flow behavior during high strain rate superplasticity in an al-mg-sc alloy
AU - Komura, Shogo
AU - Horita, Zenji
AU - Furukawa, Minoru
AU - Nemoto, Minoru
AU - Langdon, Terence G.
N1 - Funding Information:
This work was supported, in part, by the Light Metals Educational Foundation of Japan; in part by a Grant-in-Aid for Scientific Research from the Ministry of Education, Science, Sports and Culture of Japan; in part by the Japan Society for the Promotion of Science; and in part by the National Science Foundation of the United States under Grant Nos. DMR-9625969 and INT-9602919.
PY - 2001
Y1 - 2001
N2 - An Al-3 pct Mg-0.2 pct Sc alloy was fabricated by casting and subjected to equal-channel angular pressing to reduce the grain size to ∼0.2 μm. Very high tensile elongations were achieved in this alloy at temperatures over the range from 573 to 723 K, with elongations up to >2000 pct at temperatures of 673 and 723 K and strain rates at and above 10-2 s-1. By contrast, samples of the same alloy subjected to cold rolling (CR) yielded elongations to failure of <400 pct at 673 K. An analysis of the experimental data for the equal-channel angular (ECA)-pressed samples shows consistency with conventional superplasticity including an activation energy for superplastic flow which is within the range anticipated for grain boundary diffusion in pure Al and interdiffusion in Al-Mg solid solution alloys.
AB - An Al-3 pct Mg-0.2 pct Sc alloy was fabricated by casting and subjected to equal-channel angular pressing to reduce the grain size to ∼0.2 μm. Very high tensile elongations were achieved in this alloy at temperatures over the range from 573 to 723 K, with elongations up to >2000 pct at temperatures of 673 and 723 K and strain rates at and above 10-2 s-1. By contrast, samples of the same alloy subjected to cold rolling (CR) yielded elongations to failure of <400 pct at 673 K. An analysis of the experimental data for the equal-channel angular (ECA)-pressed samples shows consistency with conventional superplasticity including an activation energy for superplastic flow which is within the range anticipated for grain boundary diffusion in pure Al and interdiffusion in Al-Mg solid solution alloys.
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U2 - 10.1007/s11661-001-1006-9
DO - 10.1007/s11661-001-1006-9
M3 - Article
AN - SCOPUS:3042713296
SN - 1073-5623
VL - 32
SP - 707
EP - 716
JO - Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
JF - Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
IS - 13
ER -