| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Phase Transformations and Microstructural Evolution
|
| Presentation Title |
Interrelationship of stress-induced martensitic transformation and pitting corrosion in iron-based shape memory alloys |
| Author(s) |
Johanna Frenck, Georg Frenck, Sebastian Degener, Malte Vollmer, Thomas Niendorf |
| On-Site Speaker (Planned) |
Johanna Frenck |
| Abstract Scope |
In recent years, iron-based shape memory alloys have become increasingly attractive for potential applications in civil engineering. The characteristic phase transformation results in high damping capacities, that are of particular interest for buildings in earthquake-prone areas. Electrochemical corrosion tests on Fe-Mn-Al-Ni-Cr shape memory alloys have revealed that specimens, that are characterized by an austenitic matrix with randomly distributed stress induced martensite plates, appeared to form a protective oxide layer on the surface. However, severe pitting corrosion of the γ' martensite plates led to an unstable passive corrosion behavior. Incremental strain tests on precorroded specimens revealed that the significant changes of surface quality did not have a negative effect on the mechanical properties. However, it was shown that areas with retained martensite serve as nucleation zones for further corrosion damage. Eventually, stress-induced corrosion cracks develop, which are very detrimental with respect to functional response. |
| Proceedings Inclusion? |
Planned: |