Abstract
An enhancement of plastic flow under an applied tensile stress has been observed during a relatively slow γ(fcc)→ αm (bcc) massive transformation in a Fe 2.0 at. pct Cr alloy. As the rate of transformation increases with undercooling the flow rate also increases; but the time during which the enhanced flow can take place becomes progressively shortened. Enhanced plastic flow was not observed during a β(bcc) → ξm (hep) massive transformation in Ag-Al and Cu-Ga alloys, apparently because the duration of the trans-formation was too short to yield a measurable effect. The elongation behavior observed during the γ → αm reaction indicates that an enhanced flow is associated with the move-ment of the incoherent γ/αm interfaces that are active during a massive transformation and that the rate of enhanced flow increases with increased interface velocity.
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