Abstract
Recent successes in producing bulk amorphous alloys have renewed interest in this class of materials. Although amorphous metallic alloys have been shown to exhibit strengths in excess of 2.0 GPa, most of the earlier studies on such materials were conducted on tape or ribbon specimens due to the high cooling rates required to achieve the amorphous structure. The primary purpose of this investigation was to determine the fracture toughness of a bulk metallic glass utilizing conventional procedures typically conducted with engineering materials. In particular, the effects of changes in the notch root radius from 250 {micro}m to a fatigue precrack on the toughness were determined. It is shown presently that the average toughness obtained from 6 fatigue precracked specimens was 18.4 {+-} 1.4 MPa {radical}m, while the notch toughness obtained on specimens with notch root radii ranging from 65 {micro}m-250 {micro}m were in the range of 101--131 MPa{radical}m.
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