TY - JOUR
T1 - Equal-channel angular pressing using plate samples
AU - Kamachi, Masakazu
AU - Furukawa, Minoru
AU - Horita, Zenji
AU - Langdon, Terence G.
N1 - Funding Information:
We are grateful to Mr. A.J. Barnes (Superform USA Inc., Riverside, California) for several invigorating discussions on the pressing of plate samples. This work was supported in part by the Light Metals Educational Foundation of Japan and in part by the US Army Research Office under Grant No. DAAD19-00-1-0488.
PY - 2003/11/25
Y1 - 2003/11/25
N2 - Equal-channel angular pressing (ECAP) was applied to plate samples of high-purity aluminum using processing route BCZ in which the plate is rotated by 90° in the same sense about the Z -axis between each pass. Samples were taken to a total of 4 passes, equivalent to an imposed strain of ∼4, and then examined microscopically. In the as-pressed condition, the grain size was ∼0.9 μm but the microstructure exhibited some inhomogeneity with extensive areas (∼70-80% of the total) of equiaxed grains and other areas containing elongated grains. This limited inhomogeneity was not apparent in the macroscopic properties since the Vickers microhardness, Hv, was essentially identical at all points on all planes of sectioning and the tensile behavior at room temperature was independent of the direction of orientation of the specimen gauge lengths. The tendency to develop an inhomogeneous microstructure is explained by reference to the predicted shearing patterns for processing using route BCZ with plate samples.
AB - Equal-channel angular pressing (ECAP) was applied to plate samples of high-purity aluminum using processing route BCZ in which the plate is rotated by 90° in the same sense about the Z -axis between each pass. Samples were taken to a total of 4 passes, equivalent to an imposed strain of ∼4, and then examined microscopically. In the as-pressed condition, the grain size was ∼0.9 μm but the microstructure exhibited some inhomogeneity with extensive areas (∼70-80% of the total) of equiaxed grains and other areas containing elongated grains. This limited inhomogeneity was not apparent in the macroscopic properties since the Vickers microhardness, Hv, was essentially identical at all points on all planes of sectioning and the tensile behavior at room temperature was independent of the direction of orientation of the specimen gauge lengths. The tendency to develop an inhomogeneous microstructure is explained by reference to the predicted shearing patterns for processing using route BCZ with plate samples.
UR - http://www.scopus.com/inward/record.url?scp=0142154956&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0142154956&partnerID=8YFLogxK
U2 - 10.1016/S0921-5093(03)00522-7
DO - 10.1016/S0921-5093(03)00522-7
M3 - Article
AN - SCOPUS:0142154956
SN - 0921-5093
VL - 361
SP - 258
EP - 266
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 -