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. The solute enrichment of the austenite particles may be a factor contributing to the low Ms  of the particles,  but it does not fully account for the high  austenite   thermal  stability. The  presence  of  a high  dislocation  density  within  the  austenite  particles suggests that the stability of these particles may have  substructural  as  well  as  chemical  origins. Some  stability  of  the  austenite  particles  may  be probably due to increased difficulty in propagating
the  shear  of  the  martensitic  transformation  via  ncreased  barriers  afforded  by  the  substructure  in  the austenite particles.

ÆäÖÐ The  presence  of  a  high  dislocation  density  within  the  austenite  particles suggests that the stability of these particles may  have  substructural  as  well  as  chemical  origins.

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