Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 529, Issue -, Pages 230-236Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2011.09.022
Keywords
Stacking fault energy; Deformation behavior; Work hardening rate; Activation volume; Cu based alloys; Transmission electron microscopy
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Funding
- National Science Foundation [DMR-0806323]
- Deutsche Forschungsgemeinschaft [FR 1714/5-1]
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Pure copper and Cu-12.1 at.%Al-4.1 at.%Zn alloy were subjected to rolling in liquid nitrogen. TEM studies showed that dynamic recovery during the deformation process was effectively suppressed and hence microstructures with dislocation substructure and deformation twins were formed. Mechanical properties were assessed via microtensile testing that shows improved yield strength, 520 +/- 20 MPa, and ductility, 22%, in the case of pure copper. Alloying with Al and Zn results in reduction in stacking fault energy (SFE) which can contribute to enhanced strength and good ductility. Physical activation volume obtained via stress relaxation tests is 26b(3), and 8 b(3) for pure copper, and Cu-12.1 at.%Al-4.1 at.%Zn, respectively. The effect of SFE on work hardening rate of samples is discussed. Although twinning is observed in the alloy, it is concluded that network dislocation strengthening plays the major role in determining the mechanical properties. (C) 2011 Elsevier B.V. All rights reserved.
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