About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
|
Symposium
|
Fatigue in Materials: Fundamentals, Multiscale Characterizations and Computational Modeling
|
Presentation Title |
Enhancing Fatigue Crack Growth Resistance of High Strength Aluminum Alloys Reinforced by Shape Memory Alloy |
Author(s) |
Nelson Affonseca Netto, Lv Zhao, Eric Charkaluk, Aude Simar |
On-Site Speaker (Planned) |
Nelson Affonseca Netto |
Abstract Scope |
In the framework of metal matrix composites (MMCs), shape memory alloys (SMAs), when serving as reinforcements, provide a possibility to tune cracking mechanisms due to their shape memory effect (SME). The SME is used to introduce local internal stresses in the vicinity of the reinforcements, attracting or repelling the propagating crack, therefore leading to fracture path deviation and enhancing resistance to crack growth.
In the present work, nitinol (NiTi) particles were used as particulate reinforcements for Al7075 and the composites have been manufactured via friction stir processing (FSP) to prove the aforementioned concept. According to fatigue crack propagation tests, the Al7075/NiTi composites present lower fatigue crack growth rate compared to the FSPed Al7075 reference material as well as the Al7075/NiTi composites without internal stresses. Digital image correlation (DIC) analysis allows for an understanding of the plasticity and damage mechanism at the crack tip during its propagation. |
Proceedings Inclusion? |
Planned: |
Keywords |
Other, Other, Other |