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(a) CL assessment of the stress field, σ, in the vicinity of metastable zirconia domains in pristine BIOLOX®delta ZTA femoral heads and after they have been subjected to increasing exposures in the autoclave at 121 °C (for 5~300 h; cf. labels in inset); and (b) plots showing off-stoichiometric drift within the alumina matrix (i.e., the intensity of the CL emission from oxygen vacancy sites) and the amounts of polymorphic transformation by Raman spectroscopy.
