Abstract
Amorphous Al88(Y1-xCex)2Ni9Fe1 alloys containing nanoscale fcc-Al particles have been found to exhibit tensile fracture strength (σf) and hardness (HV) higher than those of amorphous single phase alloys with the same compositions, without detriment to good bending ductility. The particle size of the fcc-Al phase increases in the range of 3 to 30nm with a decrease in cooling rate. The HV and Young's modulus (E) increase monotonously with increasing volume fraction of the fcc phase (Vf), while the σf shows a maximum in the Vf range of 5 to 26% (e.g., 1560MPa at 25% Vf for Al88Ce2Ni9Fe1).The increase in σf in the Vf range below 26% is presumably due to an enhancement of the resistance to shear deformation caused by the nanoscale fcc particles which have hardness higher than that for the amorphous phase with the same compositions. The highest σf for the Al88Ce2Ni9Fe1 alloy is much higher than that (1320MPa) for the Al88Y2Ni9Fe1 alloy. It is presumably a reason for this difference that the bonding force between Al and Ce atoms is stronger than that between Al and Y.
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