TY - JOUR
T1 - Exceptional superplasticity in an AZ61 magnesium alloy processed by extrusion and ECAP
AU - Miyahara, Yuichi
AU - Horita, Zenji
AU - Langdon, Terence G.
N1 - Funding Information:
We are grateful to Dr. Bodo Gerold of BIOTRONIK GmbH & Co., Erlangen, Germany, for supplying the extruded AZ61 alloy. This work was supported in part by a Grant-in-Aid for Scientific Research from the Ministry of Education, Culture, Sports, Science and Technology of Japan, in part by the Light Metals Educational Foundation of Japan and in part by the National Science Foundation of the United States under Grant No. DMR-0243331.
PY - 2006/3/25
Y1 - 2006/3/25
N2 - Experiments were conducted on a commercial AZ61 alloy to evaluate the potential for achieving an ultrafine grain size and superplastic ductilities through the use of the EX-ECAP two-step processing procedure of extrusion plus equal-channel angular pressing. The results show that EX-ECAP gives excellent grain refinement with grain sizes of ∼0.6 and ∼1.3 μm after pressing at 473 and 523 K, respectively. The alloy processed by EX-ECAP exhibits exceptional superplastic properties including a maximum elongation of 1320% after pressing through four passes when testing at 473 K with an initial strain rate of 3.3 × 10-4 s-1. This result compares with an elongation of ∼70% achieved in the extruded condition without ECAP under similar testing conditions.
AB - Experiments were conducted on a commercial AZ61 alloy to evaluate the potential for achieving an ultrafine grain size and superplastic ductilities through the use of the EX-ECAP two-step processing procedure of extrusion plus equal-channel angular pressing. The results show that EX-ECAP gives excellent grain refinement with grain sizes of ∼0.6 and ∼1.3 μm after pressing at 473 and 523 K, respectively. The alloy processed by EX-ECAP exhibits exceptional superplastic properties including a maximum elongation of 1320% after pressing through four passes when testing at 473 K with an initial strain rate of 3.3 × 10-4 s-1. This result compares with an elongation of ∼70% achieved in the extruded condition without ECAP under similar testing conditions.
UR - http://www.scopus.com/inward/record.url?scp=33645542005&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=33645542005&partnerID=8YFLogxK
U2 - 10.1016/j.msea.2006.01.043
DO - 10.1016/j.msea.2006.01.043
M3 - Article
AN - SCOPUS:33645542005
VL - 420
SP - 240
EP - 244
JO - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
JF - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
SN - 0921-5093
IS - 1-2
ER -