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- W3084584204 abstract "Significant grain refinement of AZ91 alloys was achieved by ceramic nanoparticle(NP)-induced growth control. Advanced characterization techniques including 3D tomography and in-situ observation were carried out to examine the microstructure evolution. The results show that the NPs are distributed in matrix in three ways, i.e. along the grain boundaries, inside the α-Mg grains and within the interior of β phases. The intergranular NPs that are distributed along the grain boundaries can form a multilayer of NPs covering the surface of α-Mg, greatly restricting the grain growth. A numerical model is proposed to predict the grain size, in which the solute concentration gradient at dendrite tip and the impingement of grains are recognized as two pivotal factors in modelling. It is demonstrated from the model prediction that a reduced growing rate of α-Mg can be obtained upon NP addition due to the lowered solute concentration gradient at dendrite tip, which could increase the nucleation events, accelerate the grain impingement and thus induce significant grain refinement. Given the chemically and thermally stability of ceramic NPs, which can avoid the intrinsic drawbacks of conventional inoculation, e.g. element poisoning, NP-induced growth control (NIGC) may provide a new avenue for grain refinement in magnesium alloys." @default.
- W3084584204 created "2020-09-21" @default.
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- W3084584204 date "2020-11-01" @default.
- W3084584204 modified "2023-09-23" @default.
- W3084584204 title "Nanoparticle-induced growth behavior of primary α-Mg in AZ91 alloys" @default.
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- W3084584204 doi "https://doi.org/10.1016/j.matdes.2020.109146" @default.
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