| About this Abstract |
| Meeting |
2022 TMS Annual Meeting & Exhibition
|
| Symposium
|
Environmentally Assisted Cracking: Theory and Practice
|
| Presentation Title |
Stress Corrosion Cracking Behavior of Mg-Al-Zn Alloys in Humid Air |
| Author(s) |
Toshiaki Manaka |
| On-Site Speaker (Planned) |
Toshiaki Manaka |
| Abstract Scope |
Magnesium alloys have been known to be susceptible to stress corrosion cracking(SCC), which is based on hydrogen embrittlement. In the present study, the SCC behavior of Mg-Al-Zn alloys with different amounts of Al was investigated by slow strain rate tensile testing at room temperature in two environments: humid air(HA) with relative humidity of 90% or above and dry nitrogen gas (DNG) atmosphere with relative humidity of 5% or less. The elongation of the specimens in HA was smaller than that in DNG. SEM observation revealed that fracture surfaces were covered with fine dimples in DNG, while quasi-cleavage fracture without corrosion product was observed near the specimen surface in HA. It is assumed that hydrogen atoms invaded into the specimen by reaction between water vapor and magnesium surface, and caused the degradation of ductility, resulting in hydrogen embrittlement. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Magnesium, Environmental Effects, |