Journal
JOURNAL OF MATERIALS SCIENCE
Volume 50, Issue 20, Pages 6700-6712Publisher
SPRINGER
DOI: 10.1007/s10853-015-9224-5
Keywords
-
Categories
Funding
- NRF Korea - MoE [NRF-2014R1A1A2057697]
- National Science Foundation of the United States [DMR-1160966]
- European Research Council under ERC [267464-SPDMETALS]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1160966] Funding Source: National Science Foundation
Ask authors/readers for more resources
An Al-33 % Cu eutectic alloy was processed by high-pressure torsion (HPT) at room temperature under a compressive pressure of 6.0 GPa for different revolutions up to 10 turns. The Vickers microhardness and microstructure were investigated on vertical cross sections of the disks to evaluate the evolution toward homogeneity with increasing numbers of HPT turns. The hardness behavior follows the strain hardening model of materials after HPT processing and the microstructural development confirms that there is essentially a compatibility between hardness and microstructure in the Al-Cu alloy when processing by HPT. The tensile properties were examined at a high temperature of 723 K after 5 and 10 turns of HPT using a series of strain rates from 3.3 x 10(-5) to 1.0 x 10(-1) s(-1). Excellent superplastic ductilities were achieved when testing at strain rates below 1.0 x 10(-3) s(-1) with a highest elongation of similar to 1220 % after 10 turns at an initial strain rate of 1.0 x 10(-4) s(-1). Close inspection showed that the optimal superplastic strain rates are displaced to a faster strain rate with increasing revolutions from 5 to 10 turns. A deformation mechanism map was constructed for a testing temperature of 723 K using a combination of theoretical relationships and earlier experimental data reported for a conventional coarse-grained Al-33 % Cu alloy. Inspection shows that this map is in excellent agreement with the experimental data for the ultrafine-grained Al-33 % Cu alloy after processing by HPT.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available