PREPARATION OF BULK AMORPHOUS-ALLOYS BY EXPLOSIVE CONSOLIDATION AND PROPERTIES OF THE PREPARED BULK

Preparation of bulk amorphous alloys was carried out by explosive consolidation, using iron-and cobaltbased flaky amorphous alloy powders or iron-and nickel-based spherical amorphous alloy powders. In the cylindrical compacts prepared at first, some cracks and crystallization were found in the region near the central axis. To prevent those occurring, a metallic bar with a shock impedance similar to that of the amorphous alloy powders was put at the centre of the container. As a result, bulk amorphous alloys with a density of 99.7 PERCENT or more of the density of amorphous alloy ribbon were prepared successfully without inducing cracks. Other properties such as Young's modulus, Curie temperature, electrical resistivity and Vicker's hardness of the bulks were close to those of ribbon prepared by melt spinning.