کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1449851 | 988716 | 2007 | 11 صفحه PDF | دانلود رایگان |
The temporal evolution of the nanostructure and chemistry of a model Ni–8.5 at.% Cr–10 at.% Al alloy with the addition of 2 at.% Re was studied using transmission electron microscopy and atom-probe tomography in order to measure the number density and mean radius of the γ′ (L12) precipitates and the chemistry of the γ′-precipitates and the γ (fcc)-matrix. In this article, the coarsening behavior of the γ′-precipitates is discussed in detail and compared with the Umantsev–Olson model for multi-component alloys. In addition, the experimental results are evaluated with PrecipiCalc™ simulations. The results show that the diffusivities of the solute elements play a major role in the coarsening behavior of the γ′-precipitates and that the addition of Re retards the coarsening kinetics and stabilizes the spheroidal morphology of the precipitates by reducing the interfacial energy.
Journal: Acta Materialia - Volume 55, Issue 4, February 2007, Pages 1159–1169