Amorphous fibres of the Alsystem were prepared by a melt extraction technique, and subjected to crystallisation. T he quality of the melt extracted fibres is controlled by the wheel edge and rotational speed, with both having a significant eVect on fibre diameter and avoidance of irregularities and instabilities along the fibre length. T ensile strength in the glassy state varied from 0•6 to 1•0 GPa. Crystallisation activation energies calculated f rom scan-rate dependence of DTA peaks are 741 and 1374 kJ mol−1 for E1 (Al 2 O 3 -yttrium aluminium garnet (YAG) eutectic), 390 kJ mol−1 for YAG, and 438 kJ mol−1 for E2 (YAG-yttrium aluminium perovskite (YAP) eutectic) by the Kissinger method; and 698 and 1346 kJ mol−1 for E1, 352 kJ mol−1 for YAG, and 399 kJ mol−1 for E2 by the Augis-Bennett method.BCT /438
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