Mössbauer Studies of Internally Nitrided and Oxidized Alloys
The reactions between mobile interstitial atoms and substitutional solute atoms in alloys is a topic of considerable metallurgical interest. Internally nitrided Fe base alloys frequently exhibit significantly improved mechanical properties, such as high hardness and yield strength values. Alloy oxidation (both internal and external), on the other hand, is generally undesirable, and the aim of most research in this area is to prevent or limit such oxidation. Both subjects have been extensively studied,(1,2) and many of the most interesting aspects of both problems involve internally formed nitride or oxide „phases“ which are dispersed on an extremely fine scale, ranging from molecular clusters to fine platelets with thicknesses of the order of 10 to 20 Å. Mössbauer spectroscopy, with its high sensitivity to valence state and local atomic environment is an excellent method of studying such systems and in the current paper, some recent work in this area is summarized.
KeywordsSolute Atom Nitride Phase Octahedral Interstice Internally NITRIDED Nitrided Alloy
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