Abstract
A procedure is described during which alloy melts are accelerated in a centrifuge and afterwards hurled with high velocities against a cold substrate on which they solidify very rapidly after spreading out to form a thin film. The application of this method to MgGa alloys leads to the production of strongly supersaturated α-solid-solutions with Ga contents up to about 10 at. %, to the disclosure of a non-crystalline solid phase in the concentration range around 19 at. % Ga and to the detection of a metastable crystalline phase which forms from the amorphous MgGa alloy. The structure of this intermetallic compound is orthorhombic, as found from X-ray structure investigations. The possible structural relations of this phase with the stable phase Mg 5Ga 2 are discussed.
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