{'fraction_non_alphanumeric': 0.02413793103448276, 'fraction_numerical': 0.0, 'mean_word_length': 5.952095808383233, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
AEM / HRTEM Studies of Interface Diffusion-Controlled Transformations

Interface diffusion plays a central and rate-determining role in a variety of solid phase transformations. In polycrystalline materials, high angle grain boundaries are the prominent interfaces, acting as high diffusion paths for the transport of solute atoms. As a result, a number of well-defined microstructures are developed, depending upon the material‘s composition and treatment conditions. From the phenomenological point of view, it is common to consider two major categories: transformations driving by stationary grain boundaries and those driven by moving grain boundaries. The former corresponds to classical heterogeneous precipitation and segregation phenomena, and the latter is related to discontinuous precipitation, coarsening and dissolution reactions in materials. In the present contribution it is shown, by means of a representative example, that the application of analytical (AEM) and highresolution transmission electron microscopy (HRTEM) allows one to obtain, respectively, nano-scale compositional together with structural information down to the atomic level.