| About this Abstract |
| Meeting |
Materials Science & Technology 2011
|
| Symposium
|
Interfaces, Grain Boundaries and Surfaces from Atomistic and Macroscopic Approaches -- Fundamental and Engineering Issues
|
| Presentation Title |
High Resolution TEM and Atomistic Simulations
of Al3Mg2 – Al Interfaces in Al-Mg Alloy
|
| Author(s) |
Ronald Holtz, Noam Bernstein, Ramasis Goswami |
| On-Site Speaker (Planned) |
Ronald Holtz |
| Abstract Scope |
5xxx series Al-Mg alloys become sensitized to intergranular corrosion (IGC) if exposed to temperatures above 50C for extended times. Sensitization is due to formation of beta phase, Al3Mg2, known as Sampson Phase, on the grain boundaries. Although IGC, stress-corrosion cracking and corrosion-fatigue are the principal hazards for sensitized alloy, it is necessary to consider the effect of the two-phase structure on the micromechanical properties in the absence of the corrosion environment. Among other things, we have performed high-resolution TEM studies of the beta-alpha interface in Al-Mg alloys, including commercial alloys with low beta content and alloys we have made with high beta fraction. Crystallographic relationships at the interfaces, faults, partial dislocations, anti-phase boundaries, and cracks have been analyzed. Crystallographic information has been used to support atomistic simulations of the Al3Mg2 yielding information about the surface energies of the phases and their interfaces. |
| Proceedings Inclusion? |
Definite: A CD-only volume |