TY - JOUR
T1 - Fabrication of bulk ultrafine-grained materials through intense plastic straining
AU - Berbon, Patrick B.
AU - Tsenev, Nikolai K.
AU - Valiev, Ruslan Z.
AU - Furukawa, Minoru
AU - Horita, Zenji
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 National Science Foundation of the United States under Grant Nos. DMR-9625969 and INT-9602919, and in part by the United States Army Research Office under Grant Nos. DAAH04-96-1-0332 and N68171-96-6-9006.
PY - 1998
Y1 - 1998
N2 - Ultrafine grain sizes were introduced into samples of an Al-3 pet Mg solid solution alloy and a cast Al-Mg-Li-Zr alloy using the process of equal-channel angular (ECA) pressing. The Al-3 pet Mg alloy exhibited a grain size of ∼0.23 μm after pressing at room temperature to a strain of ∼4, but there was significant grain growth when the pressed material was heated to temperatures above ∼450 K. The Al-Mg-Li-Zr alloy exhibited a grain size of ∼ 1.2 yum, and the microstructure was heterogeneous after pressing to a strain of ∼4 at 673 K and homogeneous after pressing to a strain of ~8 at 673 K with an additional strain of ∼4 at 473 K. The heterogeneous material exhibited superplasticlike flow, but the homogeneous material exhibited high-strain-rate superplasticity with an elongation of >1000 pet at 623 K at a strain rate of 10-2 s-1. It is concluded that a homogeneous microstructure is required, and therefore a high pressing strain, in order to attain high-strain-rate superplasticity (HSR SP) in ultrafme-grained materials.
AB - Ultrafine grain sizes were introduced into samples of an Al-3 pet Mg solid solution alloy and a cast Al-Mg-Li-Zr alloy using the process of equal-channel angular (ECA) pressing. The Al-3 pet Mg alloy exhibited a grain size of ∼0.23 μm after pressing at room temperature to a strain of ∼4, but there was significant grain growth when the pressed material was heated to temperatures above ∼450 K. The Al-Mg-Li-Zr alloy exhibited a grain size of ∼ 1.2 yum, and the microstructure was heterogeneous after pressing to a strain of ∼4 at 673 K and homogeneous after pressing to a strain of ~8 at 673 K with an additional strain of ∼4 at 473 K. The heterogeneous material exhibited superplasticlike flow, but the homogeneous material exhibited high-strain-rate superplasticity with an elongation of >1000 pet at 623 K at a strain rate of 10-2 s-1. It is concluded that a homogeneous microstructure is required, and therefore a high pressing strain, in order to attain high-strain-rate superplasticity (HSR SP) in ultrafme-grained materials.
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U2 - 10.1007/s11661-998-0101-6
DO - 10.1007/s11661-998-0101-6
M3 - Article
AN - SCOPUS:0032164507
SN - 1073-5623
VL - 29
SP - 2237
EP - 2243
JO - Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
JF - Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
IS - 9
ER -