Die-cast Mg-Al-rare earth (RE) alloys are normally used in the as-cast condition without the application of heat treatment because it is a common perception that heat treatment will not provide benefit to these alloys. This paper reports, for the first time, that enhanced age hardenability can be achieved in die-cast Mg-Al-RE alloys with minor Mn additions. For example, the yield strength of Mg-4. wt%Al-3. wt%La alloy with 0.32. wt% Mn is increased by ~34. MPa (~26%) after ageing at 200. °C for 32. h (T5). The enhanced age hardenability is associated with the precipitation of nanoscale Al-Mn particles during ageing.
|Number of pages||5|
|Journal||Materials Science and Engineering A: Structural Materials: Properties, Microstructure and Processing|
|Publication status||Published - 22 Feb 2016|
- Magnesium alloys
- Mn additions