Influence of impurities on stacking fault energy determination
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A standard technique used to determine stacking fault energies is the so-called node method in which a measurement of the curvature of partials surrounding an extended node may be related to the fault energy. A basic assumption that is made, either implicitly or explicitly, when employing this technique is that the degree of nodal extension is not influenced by precipitation or segregation effects. Clearly, if the shape or size of a node is influenced in this manner, the measured values of SFE may not be meaningful with regard to interpreting properties such as yield strength, creep behavior, susceptibility to stress-corrosion, and so forth. An example of the dramatic role that impurities can play in distorting the equilibrium dimensions of extended nodes through precipitation effects is presented in this paper.
KeywordsBoron Burger Vector Stack Fault Energy Cellulose Nitrate Extended Node
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