Abstract
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.
| Original language | English |
|---|---|
| Article number | 012014 |
| Journal | IOP Conference Series: Materials Science and Engineering |
| Volume | 84 |
| Issue number | 1 |
| DOIs | |
| 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 |
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All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Engineering(all)
Cite this
Real-time synchrotron x-ray observations of equiaxed solidification of aluminium alloys and implications for modelling. / Prasad, A.; Liotti, E.; McDonald, S. D.; Nogita, Kazuhiro; Yasuda, H.; Grant, P. S.; Stjohn, D. H.
In: IOP Conference Series: Materials Science and Engineering, Vol. 84, No. 1, 012014, 11.06.2015.Research output: Contribution to journal › Conference article
}
TY - JOUR
T1 - Real-time synchrotron x-ray observations of equiaxed solidification of aluminium alloys and implications for modelling
AU - Prasad, A.
AU - Liotti, E.
AU - McDonald, S. D.
AU - Nogita, Kazuhiro
AU - Yasuda, H.
AU - Grant, P. S.
AU - Stjohn, D. H.
PY - 2015/6/11
Y1 - 2015/6/11
N2 - 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.
AB - 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.
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U2 - 10.1088/1757-899X/84/1/012014
DO - 10.1088/1757-899X/84/1/012014
M3 - Conference article
AN - SCOPUS:84939487925
VL - 84
JO - IOP Conference Series: Materials Science and Engineering
JF - IOP Conference Series: Materials Science and Engineering
SN - 1757-8981
IS - 1
M1 - 012014
ER -