168 Prakt. Met. Sonderband 52 (2018) 
shown in a schematic drawing of the indent and its 180°-rotation in Figure 4a. The schematic 
indent without rotation is shown in Figure 4b, where parallel deformation lines are visible, i» 
which intersect each other at angles between about 52°-58°. J 
Wang et al. [8] explained the formation of the two-fold symmetric pattern by the material - 
displacement, which occurs out-of-plane and along the zone-axis of the primary (111)-slip 
planes and the indented (011)-surface plane and gave the angle between the [100]- and 
the [211]-direction on a (011)-oriented surface with 35.3°. The angles measured in this study 
range between about 52°-58°, which is in good agreement with the angle between the [101}- 
and the [121]-direction (Figure 5a), when it is taken into account, that the specimen surface 
is not perfectly horizontal and the grain not ideally in (101)-orientation (10° tilt angle). The 
good agreement of the angles between the [101]- and the [121]-direction can be seen 
graphically in Figure 5b, where an overlay of the directions on the deformation structure is 
shown. 
Summing up the results gained from the deformation structure and the EBSD analysis, it is 
concluded that the deformation in the alloy in the (101)-orientation is governed by dislocation 
slip. The governing deformation mechanisms of grains with (001)- and (111)-orientation 
needs to be investigated in further experiments. 
gE 
1, SUM 
(a) (b) oe 
Figure 4. (a) Two-fold symmetry observed by rotating a schematic drawing of indent and 
deformation pattern (grey) by 180° (red), (b) angles between deformation lines ranging 
between about 52°-58°. 
i" 
(101)-plane 
121] a 
ha 
y 1010] x 
x. la 423) or 
0 [121] vr 
—e is r N 
101] DS 
(a) (b) 
Figure 5: (a) Observed out-of-plane material displacement profile on an (101)-oriented 
surface plane showing the angle of 35.3° between the [010]- and the [121]-direction and 
54.7° between the [121]-direction and [101]-direction for slip on the (111)-plane; 
(b) overlay of the directions and angles on the schematic deformation structure pattern.