Supervision meeting
next meeting in two weeks time.
Works should be submitted before next meeting:
1. Abstract for the 3D Materials Conference
2. Report of the tomography work
Problems encountered during the meeting:
1. the effects of shrinkage porosity. The amount of shrinkage porosity in Al-Si alloy.
2. John Campbell's theory, is that trustable or not?
3. modelling oxide film defects, but affected by the shrinkage porosity. If I use chill plate to change the thermal field distribution and hence change the distribution of shrinkage porosity, will that affect the reliability of the modelling work?
4. Since what I'm doing is to model the oxide film defects rather than shrinkage porosity, but the experimental result only shows the effects of shrinkage porosity (and/or hydrogen porosity), can these experimental work be used to validate the model.
5. How to explain the behaviour of oxide film defects found in the tomography work?
5.1 The morphology changes (spherical shape to complex shape, small round bubble to larger round bubble, network defects keep the same shape).
5.2 The volume change of defects ( three kinds of shape)
5.3 The importance of hydrogen bubbles( porosity)
Something useful mentioned during the meeting:
1. Chill plate only change the distribution of shrinkage porosity, not eliminated that.
2. Bill works on the composition change of the oxide film defects. Nick works on the the morphology change of the oxide film defects.
