About this Abstract |
Meeting |
12th International Conference on Magnesium Alloys and their Applications (Mg2021)
|
Symposium
|
12th International Conference on Magnesium Alloys and their Applications (Mg 2021)
|
Presentation Title |
Effects of Impurity Fe on Intermetallics in AZ91 |
Author(s) |
Liuqing Peng, Jingwei Xian, Christopher Gourlay |
On-Site Speaker (Planned) |
Liuqing Peng |
Abstract Scope |
In the Mg industry, Mg-Al alloys are commonly melted/held in steel crucibles and Fe can be picked up into the melt to form Al-Mn-(Fe) intermetallic compounds (IMC) which can be potent micro-galvanic cathodes for corrosion. In this study, AZ91 was held in small Fe-0.2C crucibles at a wide temperature range of 640 – 850 °C for 4 h to obtain a different level of impurity Fe in the melt, followed by cooling at rate ~4 K/s. It is found that the increasing Fe content led to an increasing volume fraction of two Fe-rich phases: B2-Al(Fe,Mn) and Al5Fe2, and caused a change in morphology of the Al8Mn5 and Al11Mn4 particles. Direct contact between B2-Al(Fe,Mn) and Mg, and Al5Fe2 and Mg was observed at higher Fe content. The nucleation and growth of these IMCs was measured and is discussed. |
Proceedings Inclusion? |
Planned: At-meeting proceedings |