Texture analysis of a recrystallized quartzite using electron diffraction in the scanning electron microscope

The microstructure and crystallographic preferred orientation (texture) of a recrystallized quartzite from the Bergell Alps was quantitatively investi gated using automated indexing of electron backscattered patterns (EBSP). T he results are displayed in orientation maps of the microstructure and orie ntation as well as misorientation distribution functions. The orientation d istribution function derived from EBSP compares excellently with texture da ta derived from independent neutron diffraction experiments. The misorienta tion distribution function of next neighbors reveals strong maxima for smal l angle grain boundaries (subgrain boundaries) and the Dauphine twin correl ation. The Dauphine twins, which are generally not detectable optically, ar e not correlated with specific maxima in the orientation distribution funct ion. Their origin and their role during recrystallization is discussed. Dur ing recrystallization no other preferred high angle misorientations develop ed. The frequent occurrence of small angle grain boundaries indicates progr essive subgrain rotation as a recrystallization mechanism. (C) 1999 Elsevie r Science Ltd. All rights reserved.