The initial stages of ordering in alloys studied by electron diffraction and high resolution microscopy

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Abstract
SUMMARY: The combined use of selected area electron diffraction and high resolution electron microscopy can provide important information about the microstructure of materials. Both techniques have been applied to study the ordering behaviour in a number of alloys. The ordering process is not always straightforward and mostly intermediate long period modulated structures are formed. Using dark field high resolution electron microscopy the ordering sequence as well as the structure of the intermediate phases have been established for Au4Mn and Au5Mn2. For Ni4Mo the high resolution observations provide new information about the ordering mechanism in its very earliest stages.