Abstract
Billets of pure aluminum and an Al-1%Mg-0.2%Sc alloy were successfully processed using equal-channel angular pressing (ECAP) with a die having an internal channel angle of 60°. Careful inspection of the microstructures after ECAP revealed excellent agreement, at both the macroscopic and the microscopic levels, with the theoretical predictions for shearing using a 60° die. The grain sizes introduced with the 60° die were slightly smaller than with a conventional 90° die; thus, the values with these two dies were ∼1.1 and ∼1.2 μm in pure Al and ∼0.30 and ∼0.36 μm in the Al-Mg-Sc alloy, respectively. Tensile testing of the pure aluminum at room temperature revealed similar strengthening after processing using either a 60° or a 90° die. In tests conducted at 673 K, the Al-Mg-Sc alloy processed with the 60° die exhibited significantly higher elongations to failure due primarily to the larger strain imposed with this die. It is shown using orientation imaging microscopy that superplastic flow in the Al-Mg-Sc alloy produces an essentially random texture and a distribution of boundary misorientations that approximates to the theoretical distribution for an array of randomly oriented grains.
| Original language | English |
|---|---|
| Pages (from-to) | 2497-2507 |
| Number of pages | 11 |
| Journal | Acta Materialia |
| Volume | 52 |
| Issue number | 9 |
| DOIs | |
| Publication status | Published - May 17 2004 |
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All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Ceramics and Composites
- Polymers and Plastics
- Metals and Alloys
Cite this
Microstructural development in equal-channel angular pressing using a 60° die. / Furuno, Kazuko; Akamatsu, Hiroki; Oh-Ishi, Keiichiro; Furukawa, Minoru; Horita, Zenji; Langdon, Terence G.
In: Acta Materialia, Vol. 52, No. 9, 17.05.2004, p. 2497-2507.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Microstructural development in equal-channel angular pressing using a 60° die
AU - Furuno, Kazuko
AU - Akamatsu, Hiroki
AU - Oh-Ishi, Keiichiro
AU - Furukawa, Minoru
AU - Horita, Zenji
AU - Langdon, Terence G.
PY - 2004/5/17
Y1 - 2004/5/17
N2 - Billets of pure aluminum and an Al-1%Mg-0.2%Sc alloy were successfully processed using equal-channel angular pressing (ECAP) with a die having an internal channel angle of 60°. Careful inspection of the microstructures after ECAP revealed excellent agreement, at both the macroscopic and the microscopic levels, with the theoretical predictions for shearing using a 60° die. The grain sizes introduced with the 60° die were slightly smaller than with a conventional 90° die; thus, the values with these two dies were ∼1.1 and ∼1.2 μm in pure Al and ∼0.30 and ∼0.36 μm in the Al-Mg-Sc alloy, respectively. Tensile testing of the pure aluminum at room temperature revealed similar strengthening after processing using either a 60° or a 90° die. In tests conducted at 673 K, the Al-Mg-Sc alloy processed with the 60° die exhibited significantly higher elongations to failure due primarily to the larger strain imposed with this die. It is shown using orientation imaging microscopy that superplastic flow in the Al-Mg-Sc alloy produces an essentially random texture and a distribution of boundary misorientations that approximates to the theoretical distribution for an array of randomly oriented grains.
AB - Billets of pure aluminum and an Al-1%Mg-0.2%Sc alloy were successfully processed using equal-channel angular pressing (ECAP) with a die having an internal channel angle of 60°. Careful inspection of the microstructures after ECAP revealed excellent agreement, at both the macroscopic and the microscopic levels, with the theoretical predictions for shearing using a 60° die. The grain sizes introduced with the 60° die were slightly smaller than with a conventional 90° die; thus, the values with these two dies were ∼1.1 and ∼1.2 μm in pure Al and ∼0.30 and ∼0.36 μm in the Al-Mg-Sc alloy, respectively. Tensile testing of the pure aluminum at room temperature revealed similar strengthening after processing using either a 60° or a 90° die. In tests conducted at 673 K, the Al-Mg-Sc alloy processed with the 60° die exhibited significantly higher elongations to failure due primarily to the larger strain imposed with this die. It is shown using orientation imaging microscopy that superplastic flow in the Al-Mg-Sc alloy produces an essentially random texture and a distribution of boundary misorientations that approximates to the theoretical distribution for an array of randomly oriented grains.
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UR - http://www.scopus.com/inward/citedby.url?scp=2342477859&partnerID=8YFLogxK
U2 - 10.1016/j.actamat.2004.01.040
DO - 10.1016/j.actamat.2004.01.040
M3 - Article
AN - SCOPUS:2342477859
VL - 52
SP - 2497
EP - 2507
JO - Acta Materialia
JF - Acta Materialia
SN - 1359-6454
IS - 9
ER -