Precipitate structure analysis by diffraction contrast image matching for a metastable semicoherent carbide phase in molybdenum. 2

The elastic distortions and the TEM contrast due to metastable molybdenum carbide particles of unknown structure in molybdenum are computed, using previous results, by means of that tensor of generating stress-free strain which has been derived in Part I from a physical model in terms of various structure parameters. By comparison of electron micrographs with calculated images the model is confirmed and parameters are fitted. This method does not require large precipitate volume fractions as SAD or highly resolved images and extremely thin foils as lattice fringe imaging. The phase considered is proved to be a semicoherent carbide of the composition MoCsub(1-x) with f.c.c. structure and the lattice parameter 0.43 nm, which forms flat lenticular discs on (114) planes. (author)