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A study of thermal vacancies and dislocation structure in Fe-40 at.% Al

Abstract : The densities of thermal vacancies and residual dislocations in bulk specimens of Fe-40 at.% Al have been investigated using differential dilatometry and X-ray diffraction. A large quenched-in vacancy concentration at temperatures above about 873 K was apparent from the decrease in average lattice parameter. This was correlated to a lowering of the effective enthalpy of vacancy formation from about 91 to 42 kJ mol-1, possibly caused by the presence of different types of point defect in lower- and higher- temperature regimes. The residual dislocations were found to have a major concentration on lcub100rcub planes at any given temperature. An increase in the dislocation density and a concurrent fall in the vacancy concentration was observed with a lowering of the quenching temperature from 1223 to 1073 K, indicating the possibility of vacancy annihilation at 1073 K.
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Contributor : Pierre Charles Pinoli Connect in order to contact the contributor
Submitted on : Monday, July 26, 2010 - 1:05:30 PM
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Joydip Joardar, René-Yves Fillit, Anna Fraczkiewicz. A study of thermal vacancies and dislocation structure in Fe-40 at.% Al. Philosophical Magazine Letters, Taylor & Francis, 2005, 85 (6), pp.299 - 309. ⟨10.1080/09500830500157694⟩. ⟨emse-00505836⟩



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