Characterization of hypereutectic Al-19% Si alloy solidification process using in-situ neutron diffraction and thermal analysis techniques

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Proceedings titleSupplemental Proceedings: Volume 1: Materials Processing and Properties
ConferenceTMS (The Minerals, Metals and Materials Society), 2010, February 14-18, 2010, Seattle, Washington
Pages93104; # of pages: 12
Subjecthypereutectic Al-Si alloy; solidification; thermal analysis; neutron diffraction; primary Si
AbstractIn-situ thermal analysis and neutron diffraction techniques were used simultaneously to evaluate the kinetics of the non-equilibrium solidification process of Al-19%Si binary alloy. Feasibility studies concerning the application of neutron diffraction (source: NRU nuclear reactor, Chalk River, ON) for advanced solidification analysis were undertaken to explore its potential for high resolution phase analysis. Neutron diffraction patterns were collected in the stepwise mode during solidification between 740 and 400°C. The variation of intensity of the diffraction peaks was analysed and compared to the results of a conventional cooling curve analysis. Neutron diffraction was capable of detecting nucleation of the Si phase (primary and eutectic), as well as the Al phase during Al-Si eutectic nucleation. Neutron diffraction reveals the presence of Si peaks about 23°C above the liquidus temperature, as established by thermal analysis (i.e., 672°C). This illustrates the potential of neutron diffraction for high resolution melt analysis at near-liquidus temperatures, required for advanced studies of grain refining, eutectic modification, etc. The solid-to-liquid volume fraction was determined based on the change of intensity of neutron diffraction peaks over the solidification interval. Overall, the volume determined was in good agreement with the results of the cooling curve thermal analysis. This study will help to better understand the solidification mechanism of Al-Si alloys used for various component casting applications.
Publication date
AffiliationNRC Canadian Neutron Beam Centre; National Research Council Canada
Peer reviewedYes
NPARC number16945681
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Record identifier56c26964-ed4e-48e6-bfba-5b049ceef0ee
Record created2011-03-03
Record modified2016-05-09
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