85.16 Dis location in FCC crystals I Per fect dis locat ion b=na。+n2b+n2c For FCC b=-<110> Glide plane Burgers tor b o b a b o§5.16 Dislocation in FCC crystals ◆ Ⅰ.Perfect dislocation        b n a n b n c = 1 + 2 + 2 = 110  2 1 For FCC b 