Abstract
A mechanical properties microprobe was used to obtain the values of hardness and elastic modulus for a-axis and c-axis oriented single crystals of sapphire implanted with chromium (150 to 180 keV) at room temperature. Implantation caused an increase in the hardness with no detectable effect on the modulus. The effect of implantation on the apparent yield effect exhibited by nearly perfect single crystals is discussed. The residual surface compressive stresses produced by these implantations, as determined by an indentation technique, ranged from 650 to 1320 MPa.
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