[13] CAO S Q, ZHANG J X, WU J S, WANG L, CHEN J G. Microtexture grain boundary character distribution and secondary working embrittlement of high strength IF steels [J]. Mater Sci Eng A, 2005, 392: 203208. [14] ZHU L A, SANDIM H R Z, SEEFELDT M, VERLINDEN B. EBSD characterization of an ECAP deformed Nb single crystal [J]. J Mater Sci, 2010, 45: 46724681. [15] Instruction manual of Lectropol-5 [M]. Struers A/S. [16] WEST G D, THOMSON R C. Combined EBSD/EDS tomography in a dual-beam FIB/FEG-SEM [J]. J Microsc-Oxford, 2009, 233: