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Electron microscopy examinations shows that the stabilising effect attained due to a zirconium addition is caused by lower susceptibility of the Al3(Sc1 − x, Zrx) particles to coagulation in the case of Al¨C0.4% Sc¨C0.15% Zr alloy ingots in comparison with the Al3Sc particles in the case of Al¨C0.4% Sc alloy ingots

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