GBS in (14) boundary (Figure 9)

0.3truein The energy profile of another boundary: (14) during GBS shown in Figure 9 is very different from that of (21) boundary, though they have the same value. As can be seen from Figure 2, any CSL cell has two parameters: a_CSL and b_CSL. A CSL grain boundary can be formed with its interface along either a_CSL edge or b_CSL edge, and both these two boundaries have the same value. In general, a_CSL and b_CSL are not equal to each other, and also the atomic arrangements along these two CSL edges are different. Therefore, the GBS process along one CSL edges can be expected to be different from the other, as shown in Figures 8 and 9. In the latter case, there are many energy barriers, and thus the GBS process in this case is expected more difficult than the earlier one.