Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 710, Issue -, Pages 129-135Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2017.10.083
Keywords
Vibration; Compression behavior; Stress wave superposition; Dislocation; Grain refinement
Categories
Funding
- National Natural Science Foundation of China [51725504, 51435007, 51675200]
- Shenzhen Knowledge Innovation Project [201605313001169]
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In this study, the influence of low-frequency vibrations on the room-temperature compression behavior of T2 copper was experimentally investigated. Upon superposing a low-frequency vibration, the forming load noticeably reduced. Among the three vibration parameters investigated, viz. frequency, amplitude, and feeding rate, vibration amplitude plays the most important role in load reduction. The superposition of stress waves can explain the mechanism of forming load reduction at low-frequency vibrations. Due to an increase in the internal stress caused by the superposition of stress waves, the required forming load reduced. The influence of the vibrations on the microstructures of compressed specimens was also discussed. Under low-frequency vibration conditions, cyclic impact loading leads to an increase in the density of dislocations and the formation of dislocation cells, which gradually evolve into new grain boundaries, causing grain refinement.
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