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http://dx.doi.org/10.3365/KJMM.2011.49.2.137

Strengthening Mechanism of the Ni3Al-based Alloy  

Han, Chang-Suk (Dept. of Defense Science & Technology, Hoseo University)
Publication Information
Korean Journal of Metals and Materials / v.49, no.2, 2011 , pp. 137-144 More about this Journal
Abstract
Strengthening mechanisms in an ordered intermetallic compound containing coherent precipitates of lower antiphase boundary energy than the matrix were investigated on the basis of the interaction between the deformation induced dislocations and the disordered precipitates in an $Ll_2$ ordered $Ni_3Al$-based alloy. Extra work was needed to pull out the dislocations from the precipitate, which was dependent on the difference in the antiphase boundary energy between the matrix and the precipitate, as well as the size and volume fraction of the precipitate. The strength of the $Ll_2$ ordered ${\gamma}^{\prime}$ phase containing fine precipitates of the disordered ${\gamma}$ phase was examined using the proposed model. The model can explain almost quantitatively the age hardening behavior of the $Ll_2$ ordered ${\gamma}^{\prime}$ phase.
Keywords
alloys; aging; dislocations; transmission electron microscopy (TEM); strengthening mechanism;
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