Pseudo-Portevin-Le Chatelier effect in ordered alloys
- LTPCM-INPG, Saint Martin d`Heres (France)
- Univ. of Western Australia, Nedlands, Western Australia (Australia). Dept. of Mechanical and Materials Engineering
It is common knowledge that it is a negative strain rate sensitivity (SRS) of the flow stress that gives rise to unstable deformation behavior manifesting itself in serrated stress-strain curves. Dynamic interaction between mobile dislocations and diffusing solutes, referred to as dynamic strain aging, is believed to be the foremost mechanism giving rise to a negative SRS. The attendant discontinuous plastic flow is known as the Portevin-Le Chatelier (PLC) effect. However, since the occurrence of discontinuous plastic flow has serious practical consequences, notably loss of ductility, the authors deem it important to consider possible alternative mechanisms of negative SRS specific to ordered alloys. A model for a pseudo-PLC effect in ordered alloys is presented. Although no solute mechanism is involved, the model will be shown to lead to a negative SRS of the flow stress and to exhibit features of the genuine PLC effect.
- OSTI ID:
- 276175
- Journal Information:
- Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: 2 Vol. 35; ISSN 1359-6462; ISSN XZ503X
- Country of Publication:
- United States
- Language:
- English
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