In situobservation of solidification phenomena in Al–Cu and Fe–Si–Al alloys

X-Ray Videomicroscopy Studies of Eutectic Al-Si Solidification in Al-Si-Cu

“…In addition, the solute enrichment of mush melt could cause local remelting of the Al-Si eutectic, with potential detachment of fragments from the fine dendrite network, as documented in several previous studies. [25][26][27]34] …”

“…Over the last decade, an increasing number of real-time X-ray imaging studies of solidification microstructures and phenomena in real metals have been reported, addressing a broad variety of topics such as dendritic growth, [20][21][22][23] coarsening, [24] morphological transitions, [23] dendrite fragmentation, [25][26][27] solute diffusion and convection, [22,28] and momentum transfer relations in eutectics [29] and monotectics. [30] Most of these, and other recent in-situ studies, have been carried out with high-brilliance synchrotron radiation, where X-ray absorption-and near-field phase contrast is combined to bring about 2-D or 3D time-resolved data.…”

“…[30] Most of these, and other recent in-situ studies, have been carried out with high-brilliance synchrotron radiation, where X-ray absorption-and near-field phase contrast is combined to bring about 2-D or 3D time-resolved data. [20][21][22][23][24][25][26][27]29,30] …”

X‐ray Imaging and Controlled Solidification of Al‐Cu Alloys Toward Microstructures by Design

“…aluminum-silicon, Al-Si, and aluminum-copper, Al-Cu) offer interesting properties, such as good wear resistance. [1] In these alloys, stray crystals of primary (Al) phase can stem from fragmentation events during dendritic solidification, [6][7][8][9] but they are also known to nucleate in the melt in alloys of nearly nominal eutectic composition. [4,10] These stray crystals may eventually get trapped into the growing eutectic [1,11] and cause heterogeneities that alter the mechanical properties of the resulting microstructure.…”

“…thermal conductivity, heat capacity, chemical potentials, etc.). Since early developments of synchrotron x-ray radiography for observing metal and alloy solidification, [10,[21][22][23] Al-based alloys have been extensively used to study numerous solidification aspects, from dendritic fragmentation, [6][7][8][9] columnar-to-equiaxed transition, [8,37,38] temperature gradient zone melting, [39] melt convection, [40] gravity, [41] polycrystalline solutal interactions, [42] and dendritic coarsening, [43] to semi-solid deformation [44][45][46][47][48] and permeability, [49] just to name a few. More recently, "microfocus" x-ray sources [50] have provided additional tools for real-time metal and alloy observations, enabling in situ imaging with laboratory-sized equipment previously only possible at large synchrotron facilities.…”