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Entropy barriers and ageing states appear in martensiticstructural-transition models, slowly re-equilibrating after temperaturequenches, under Monte Carlo dynamics. Concepts from protein folding and ageingharmonic oscillators turn out to be useful in understanding thesenonequilibrium evolutions. We show how the athermal, non-activated delay timefor seeded parent-phase austenite to convert to product-phase martensite,arises from an identified entropy barrier in Fourier space. In an ageing stateof low Monte Carlo acceptances, the strain structure factor makesconstant-energy searches for rare pathways, to enter a Brillouin zone `golfhole' enclosing negative energy states, and to suddenly release entropicallytrapped stresses. In this context, a stress-dependent effective temperature canbe defined, that re-equilibrates to the quenched bath temperature.

Re-equilibration after quenches in athermal martensites:Conversion-delays for vapour to liquid domain-wall phases