Scanning Microscopy


Single crystal gallium arsenide (GaAs) specimens were loaded to failure. Scanning electron microscope examination of fracture surfaces showed that GaAs fails in a brittle manner on {110} planes. Features on these fracture surfaces were used to identify preexisting (critical) flaws that potentially initiated fracture when loaded by tensile stresses. Critical flaws in each specimen were identified by comparison to an intentionally damaged control. The size and shape of critical defects were consistent with existing failure models.

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