FEATURES OF INTERFACE FORMATION IN CRYSTALLITES UNDER MECHANICALLY ACTIVATED DIFFUSION. A MOLECULAR DYNAMICS STUDY.
AY Nikonov and AI Dmitriev and IS Konovalenko and EA Kolubaev and SV Astafurov and SG Psakhie, COMPUTATIONAL PLASTICITY XIII: FUNDAMENTALS AND APPLICATIONS, 982-991 (2015).
In this paper, we carried out investigation of behavior of the material under loading condition identical those used in FSW using molecular dynamic method. The loading was modelled by a rigid rotating "tool" that movies along boundary between two grains. We considered pairing of two crystallites of copper, crystallites of copper and iron, and two crystallites of aluminum 2024. Analysis of the structure of the sample showed the intermixing and stirring of dissimilar atoms as a result the FSW tool pass at the inter-crystallite boundary. It was shown, that under certain condition of loading when tool passes there a region where atoms can occupying the original position of the crystal lattice. We also show influence of an additional oscillating impact applied to the moving tool on the structure of the resulting weld. The simulation results obtained can be used for understanding the processes realized under mechanically activated diffusion.
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