About this Abstract |
Meeting |
12th International Conference on Magnesium Alloys and their Applications (Mg2021)
|
Symposium
|
12th International Conference on Magnesium Alloys and their Applications (Mg 2021)
|
Presentation Title |
An Investigation of the Mechanism of the Negative Strain Rate Sensitivity of Mg Alloys |
Author(s) |
Mohammed A. Shabana, Laurent Capolungo, Sean R. Agnew |
On-Site Speaker (Planned) |
Mohammed A. Shabana |
Abstract Scope |
Many solute strengthened alloys exhibit dynamic strain aging (negative strain rate sensitivity and often serrated flow) at particular strain rates and temperatures, and Mg alloys are no exception. It has for some time been suggested that interactions between mobile and forest dislocations are required to explain these phenomena. In a seminal work published in 2004, Picu outlined a specific mechanism for the negative strain rate sensitivity of dilute solid solutions and performed a parametric investigation of the Lomer lock case relevant to FCC alloys. In the case of HCP Mg alloys, the interactions between basal and prismatic dislocations do not have any such locked configurations. Rather, annihilation and glissile junction formation are the relevant cases. A parametric study is performed in which mobile basal dislocations encounter prismatic forest dislocations and vice versa. Implications for dynamic strain aging in Mg alloys are discussed. |
Proceedings Inclusion? |
Planned: At-meeting proceedings |