Abstract
The depth-dependence of the nanoindentation hardness in phase transition NiTi shape memory alloys and elastoplastic Al single crystals was examined through experimentation. The results indicated that there was a strong depth-dependence of hardness in both NiTi shape memory alloys and Al single crystals, and that the measured hardness correlated with different depth-dependences in each. The energy approach and dislocation plasticity method were used to explain the observed differences. The analysis indicated that the hardness of NiTi mainly comes from the resistance to the phase transition, and follows a reciprocal relationship with the indentation depth. The hardness of Al single crystal was found to originate from the plastic deformation through dislocation motion and the hardness scales with an inverse square-root of indentation depth, and surface effects become more prominent at extremely small indentation depths. The theoretical rationales were supported by the experimental results.
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