Study on the Precipitated Behavior and Stability of the Strengthening Phase Al12(Fe,X)3Si in Al-Fe-Si-X Alloys with the EET Theory
According to the empirical electron theory of solid and molecule, the effects of alloying elements on the valence electron structure, precipitated behavior and stability of Al12Fe3Si were studied in this paper. The calculation results show that the adding of V, Cr, W, Mo and Mn change the valence electron structure of Al12Fe3Si, and make its number of atom state group N increased by 2 orders of magnitude, so it make the stability of the alloy increased and then delay the coarsening speed; the adding of alloying element makes the total ability of forming bond F reduced and accelerates the precipitated of Al12Fe3Si and make it refined; the order for the adding of the alloying elements V, Cr, W, Mo and Mn of the effects on stability of Al12Fe3Si is Cr(Mn)→W(Mo)→V, and that of accelerating the dispersion precipitated of Al12Fe3Si is Cr→V→Mo→W→Mn; when practicing to design Al-Fe-Si-X alloy, we can obtain it through controlling the ratio of Fe/X to refine the particles of Al12(Fe,X)3Si, therefore, its stability can be improved and its coarsening can be delayed.
Zhengyi Jiang, Jingtao Han and Xianghua Liu
H. Qu et al., "Study on the Precipitated Behavior and Stability of the Strengthening Phase Al12(Fe,X)3Si in Al-Fe-Si-X Alloys with the EET Theory", Advanced Materials Research, Vols. 152-153, pp. 743-747, 2011