Real-time synchrotron x-ray observations of equiaxed solidification of aluminium alloys and implications for modelling

A. Prasad, E. Liotti, S. D. McDonald, K. Nogita, H. Yasuda, P. S. Grant, D. H. Stjohn

Research output: Contribution to journalConference articlepeer-review

14 Citations (Scopus)

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 languageEnglish
Article number012014
JournalIOP Conference Series: Materials Science and Engineering
Volume84
Issue number1
DOIs
Publication statusPublished - Jun 11 2015
Event14th International Conference on Modeling of Casting, Welding and Advanced Solidification Processes, MCWASP 2015 - Awaji Island, Hyogo, Japan
Duration: Jun 21 2015Jun 26 2015

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Engineering(all)

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