Abstract
Measurements of Vickers microhardness have been carried out on As x Se1−x glass (0.28 <x < 0.60). The diamond pyramid hardness number as a function of composition revealed a maximum at 40% As, the stoichiometric composition, indicating that this composition is the most ordered and strongest of the alloys. Deviation from stoichiometry was found to increase the disorder and introduce weaker bonds. An attempt was made to use the indentation approach to determine the fracture toughness of the investigated glasses. Therefore, the extent of surface traces of well-developed penny-like (conchoidal) cracks extending from the corners of Vickers indents were measured and found to obey Lawn's relationP/C 3/2 = constant (whereP is the indenter load andC is the characteristic crack dimension). An approximate value of the fracture toughness was inferred from these measurements.
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