Model systems consisting of tungsten spheres in a dense glassymatrix were fabricated by vacuum hot-pressing. Metal-glass interfacial adherence was achieved while development of new crystalline phases in the glass was avoided.nInterpretation rested on the existence of a model surface on which the introduction of flaws could be controlled. A new criterion based on the limitation of flaw size is advanced to explain the effect of second phase inclusions on strength in brittle systems. The roles of surface treatment and internal stresses for bonded and no bonded inclusions are outlined in the context of this hypothesis.
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