Abstract
The variation of Portevin-Le Chatelier (PLC) effect of as-quenched 2024 aluminum alloy caused by electrical pulse was firstly investigated. The PLC effect and PLC deformation bands can be diminished by applying electrical pulses during plastic deformation, which indicated that the electrical pulse could affect the interaction of dislocations and solute atoms. Therefore, in order to determine the role of dislocations and solute atoms in electroplastic deformation, the influences of dislocation magnification and solute atoms concentration variation on the electroplastic effect were investigated respectively. The experiments revealed that the dislocation magnification due to plastic deformation will enhance the electroplastic effect. The decrease of solute atoms concentration altered by heat treatment could weaken the electroplastic effect. Additionally, the contribution of Joule heating on electroplastic deformation was also studied and the microstructure observation showed that Joule heating effect would further improve the metal ductility due to grain boundary melting under higher current density.
| Original language | English |
|---|---|
| Pages (from-to) | 1468-1475 |
| Number of pages | 8 |
| Journal | Science of Advanced Materials |
| Volume | 9 |
| Issue number | 9 |
| DOIs | |
| Publication status | Published - 1 Sept 2017 |
Keywords
- Aging
- Aluminum alloy
- Dislocation mobility
- Electroplastic effect
- Flow stress
- Portevin-Le Chatelier (PLC) Effect