Figure 4
From: Dislocation Strengthening without Ductility Trade-off in Metastable Austenitic Steels
Dislocation pileup against the phase boundary promotes α-martensite transformation.
(a–c) TEM image sequence of an in-situ deformed metastable austenitic steel reveals the irregular growth of α-martensite. The dashed lines delineate the phase boundary. The arrows in (a,b) point to the direction of dislocation movements. The dislocation array piles up against the phase boundary. The preferential α-martensite growth is indicated by the arrow in (c). Scale bar: 100 nm. (d) The two-beam bright field TEM image shows typical dislocation arrangements in an α-martensite. Inset is the corresponding SAED pattern from the α-martensite with g = (01–1). Scale bar: 100 nm.
