Recently, in-situ observations were carried out by synchrotron X-ray radiography to observe the nucleation and growth in Al alloys during solidification. The nucleation and grain formation of a range of Al-Si and Al-Cu binary alloys were studied. When grain refiner was added to the alloys, the location of the nucleation events was readily observed. Once nucleation began it continued to occur in a wave of events with the movement of the temperature gradient across the field of view due to cooling. Other features observed were the settling of the primary phase grains in the Al-Si alloys and floating in the Al-Cu alloys, the effects of convection with marked fluctuation of the growth rate of the solid-liquid interface in the Al-Si alloys, and an absence of fragmentation. The microstructures are typical of those produced in the equiaxed zone of actual castings. These observations are compared with predictions arising from the Interdependence model. The results from this comparison have implications for further refinement of the model and simulation and modelling approaches in general. These implications will be discussed.
|Journal||IOP Conference Series: Materials Science and Engineering|
|Publication status||Published - Jun 11 2015|
|Event||14th International Conference on Modeling of Casting, Welding and Advanced Solidification Processes, MCWASP 2015 - Awaji Island, Hyogo, Japan|
Duration: Jun 21 2015 → Jun 26 2015
All Science Journal Classification (ASJC) codes
- Materials Science(all)