Atomic Ordering and Disordering of Amorphous CoNiP Alloy

Abstract:

The structure of electrolytically deposited nanocrystalline alloys of the CoP-CoNiP systems under low-temperature heating was investigated by means of high-resolution transmission electron microscopy (HRTEM), high-angle annular dark-field scanning transmission electron microscopy (HAADF STEM), and analytical methods such as energy dispersive x-ray spectroscopy (EDS) and electron energy loss spectroscopy (EELS). Structural relaxation and crystallization were investigated at temperatures from 150°C to 300°C. Structural and compositional inhomogeneities were found in the CoP-CoNiP alloys, while the local changes in composition were found to reach 15 at.%. Nanocrystals in the alloys grew most intensely in the presence of a free surface. It was determined that the local diffusion coefficient ranged from 1.2 to 2.4 10⁻¹⁸ m²/s, which could be explained by the surface diffusion prevalence. The data gathered in these investigations can be further used to predict the thermal stability of CoP-CoNiP alloys.

• Periodical: Defect and Diffusion Forum (Volume 386)
• Pages: 377-382
• DOI: https://doi.org/10.4028/www.scientific.net/DDF.386.377
• Online since: September 2018
• Authors: Evgeny Vladislavovich Pustovalov*, Alexander F. Fedorets, Vladimir Vadimovich Tkachev, Vladimir S. Plotnikov
• Keywords: Atomic Structure, Co-Based Amorphous Alloys, High Resolution Electron Microcopy, Surface Diffusion

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