Schematic of specimen surface showing area examined in this study.
Schematic of laser shock process.
Large area microstructure maps obtained using (a) EBSD showing grain boundaries in black, and (b) 540 SEM backscatter electron images showing topographic variation. Grains with observable slip steps are identified in (a), and those identified with the same number but different letter are related to each other by a small rotation .
(a) Slip steps observed on grains 2a and 2b displayed as the EBSD map grain boundaries overlaid on a SEM map section obtain from Fig. 2(b) AFM topographic map of boxed region in Fig. 4(a), with vectors , , and representing the slip trace normals. (c) Stereographic projection of crystallographic plane normals of known -titanium slip planes in grain 2b, showing that planes are the slip planes. Great circles are used to represent the slip trace normals. (d) Schematic of crystallographic plane traces parallel to slip steps in Fig. 3(b) identified using orientation information obtained from EBSD.
(a) topographic AFM map of grain 3b with vectors and representing the slip trace normals. (b) Stereographic projection of crystallographic plane normals of known -titanium slip planes in grain 3b, showing that none of them are the slip planes in this grain. The slip planes were determined to be . Great circles are used to represent the slip trace normals.
Inverse pole figure showing crystallographic plane normals parallel to specimen surface normal for (a) all grains with observed surface slip steps, (b) grains with slip plane traces, and (c) grains with slip plane traces. Values are multiple times random.
Taylor factor calculation for and slip systems for all the grains in the region studied, with grain boundaries shown as white. Grain numbers are the same as used in Fig. 3(a). It can be seen that in general, the Taylor factor is lower for the grains with slip steps.
EBSD map of area shown in Fig. 5(a) for grain 3b. Gray scale values represent average nearest neighbor misorientation as a function of location. Grain boundaries are shown as white lines. In the grains with slip steps, lattice rotation peaks are seen at the slip steps but not in the regions between. In the grain with no slip steps, lattice rotation peaks are distributed throughout.
Slip planes of steps observed on identified grains.
Article metrics loading...
Full text loading...