Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 513-14, Issue -, Pages 13-21Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2009.01.022
Keywords
Cu-Zn alloy; Dynamic plastic deformation; Nano-scale twins; Shear band; Nanograin
Categories
Funding
- National Natural Science Foundation of China [50671106, 50431010, 50071061]
- Shenyang Science & Technology Project [1071107-1-00]
- Ministry of Science and Technology of China
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The microstructures and mechanical properties of a Cu-Zn alloy subjected to dynamic plastic deformation (DPD) at liquid nitrogen temperature (77 K) were investigated. The planar dislocation activities, deformation twinning and shear banding dominate the plastic deformation of samples with different strains, respectively. Twin boundary spacing decreases with strain and nearly saturates when the strain exceeds 1.2. Shear bands occur within high-density twin region at higher strains, inside which nano-sized grains are formed. Tensile tests show that the DPD brass exhibits a high strength and a limited tensile ductility. Deformation twins play an important role in the strengthening while the appearance of shear bands obviously reduces the ductility of materials. (C) 2009 Elsevier B.V. All rights reserved.
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