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VOLUME 60 (1994) | ISSUE 10 | PAGE 722
Interstitial mechanisms for plastic low in the initial stage of loading during microindentations
Quantitative data are found on the dynamics and microscopic mechanisms of the initial stage (0-10 ms) of the loading of the hard indenter in ionic crystals with the NaCl lattice. In particular, values have been found for the contact stress and the activation volume. The typical values of this volume are a few tenths of the volume occupied by an ion in the lattice. This result, combined with the high contact stress (up to a third of the Young's modulus), points to a predominantly interstitial mechanism for mass transport in the early stages of the loading of the indenter. © 1994 American Institute of Physics.