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We propose that the machinability of hard ceramics can be improved byreversible electrochemical doping. On the example of TiO2, we show in acombined density functional theory-molecular dynamics computational study thata small amount of intercalated lithium, which preserves the host structure andcan be introduced reversibly, leads to a lowering of the strength of workmaterials and the cutting force. This is in spite of the fact that there are nosignificant modifications of the elastic constants at room temperature, i.e.the effect is mostly on plastic properties. This approach is expected to beapplicable to a class of ceramics exhibiting similar mechanisms of host-dopantinteractions and presents a reversible and non-destructive way of modifyingmechanical properties.

Non-invasive improvement of machining by reversible electrochemical doping: a proof of principle with computational modeling