Figure 2 | Scientific Reports

Figure 2

From: Superior Strength and Multiple Strengthening Mechanisms in Nanocrystalline TWIP Steel

Figure 2

RT-HPT microstructures showing solid phase transformation with respect to applied shear strains. (a) Low-magnification bright-field micrograph of RT-HPT samples. (b) Grain size distribution (average grain size 45 nm) determined from HRTEM images. (c) HRTEM images and corresponding selected area electron diffraction patterns with [011]fcc zone axis shown as inset for RT-92 samples. Solid phase transformation occurs from γ to ε-martensite. (d) The HRTEM micrograph for the RT-125 samples shows phase transformation from γ to ε- and ε- to α′-martensite at the intersection point of two ε-crystals (for detailed analysis, see the Supplementary Fig. 2).