About this Abstract |
| Meeting |
2027 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advanced Biomaterials and Implants
|
| Presentation Title |
Potential-Dependent Mechanistic Transition of Stress Corrosion Cracking in Biodegradable Zn–2Cu–0.8Mn Alloy |
| Author(s) |
Rui Yang, Yixuan Wang, Yakun Zhu, Luning Wang |
| On-Site Speaker (Planned) |
Luning Wang |
| Abstract Scope |
Stress corrosion cracking (SCC) under coupled corrosion and mechanical loading threatens the integrity of biodegradable Zn alloy implants. Here, SCC behavior of a rolled Zn–2Cu–0.8Mn alloy was investigated in 0.9 wt.% NaCl solution by slow strain rate testing under applied potentials. The results show that rolled Zn–2Cu–0.8Mn alloy exhibited a clear potential-dependent transition in SCC mechanism. Under anodic polarization, localized anodic dissolution promoted crack initiation. At 300 mV vs. OCP, IEL and IUTS reached 0.72 and 0.08, respectively, indicating pronounced SCC susceptibility. Under weak cathodic polarization, anodic dissolution was suppressed and distributed plastic deformation was observed around cracks, with the lowest SCC susceptibility at -200 mV vs. OCP. Under strong cathodic polarization, SCC was repromoted, as hydrogen-induced cracking increased SCC susceptibility. These findings reveal how applied potential regulates SCC behavior and offer new insight into biodegradable Zn alloy SCC from a coupled electrochemical–mechanical perspective. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Biomaterials, Other, |