Atomic Structure Design of Rapidly Quenched Amorphous Cobalt-Based Alloys

Abstract:

The research presents the atomic structure investigation of amorphous rapidly quenched Co₅₈Ni₁₀Fe₅Si₁₁B₁₆ at.% alloys. The alloys were quenched with linear velocity of cooper wheel surface from 22 to 38 m/s. We found a nonlinear dependence of local atomic ordering from linear velocity of cooling wheel. The average lateral density of ordered atomic clusters of 5 nm size changes from 4% to 8%. The amorphous alloy with metastable disordered structure with lower level of free energy is more stable against the external conditions. This approach can be used to determine the best technological parameters for preparing amorphous metallic alloy with metastable structure.

• Periodical: Solid State Phenomena (Volume 265)
• Pages: 569-574
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.265.569
• Online since: September 2017
• Authors: Evgeny Vladislavovich Pustovalov*, Evgeny B. Modin, Aleksandr N. Fedorets
• Keywords: Amorphous Metallic Alloys, Atomic Structure, Electron Microscopy, Image Processing

References

[1] W.K. Jun., R.H. Willens, P. Duwez, Non-crystalline Structure in Solidified Gold–Silicon Alloys, Nature, 187 (1960) 869-870.

DOI: 10.1038/187869b0

[2] Y. Zhang, et al., Hydrogen storage characteristics of the nanocrystalline and amorphous Mg–Nd–Ni–Cu-based alloys prepared by melt spinning, Int J Hydr. Energy, 39 (2014) 3790-3798.

DOI: 10.1016/j.ijhydene.2013.12.139

[3] T. Xu, et al., Synthesis of Fe75Cr5(PBC)20 bulk metallic glasses with a combination of desired merits using industrial ferro-alloys without high-purity materials, J. Alloys and Comp, 699 (2017) 92-97.

DOI: 10.1016/j.jallcom.2016.12.322

[4] Q. Wang, et al., The atomic-scale mechanism for the enhanced glass-forming-ability of a Cu-Zr based bulk metallic glass with minor element additions Sci Rep., 11 (2014) 4: 4648.

DOI: 10.1038/srep04648

[5] Y. Han, et al., Softening and good ductility for nanocrystal-dispersed amorphous Fe–Co–B alloys with high saturation magnetization above 1. 7 T, J. Alloys and Comp., 657 (2016) 237-245.

DOI: 10.1016/j.jallcom.2015.10.066

[6] E.V. Pustovalov, et al., Structure relaxation and crystallization of the CoW-CoNiW-NiW electrodeposited alloys Nanosc. Res. Lett., 9 (2014) 1-8.

DOI: 10.1186/1556-276x-9-66

[7] E.B. Modin, et al., Atomic structure and crystallization processes of amorphous (Co, Ni)–P metallic alloy, J. Alloys and Comp., 641 (2015) 139-143.

DOI: 10.1016/j.jallcom.2015.04.060

[8] F. Wan, et al., Surface crystallization and magnetic properties of FeCuSiBNbMo melt-spun nanocrystalline alloys, Mater. Res. Bull., (2017).

[9] Y. Zhang, et al., Hydrogen storage characteristics of the nanocrystalline and amorphous Mg–Nd–Ni–Cu-based alloys prepared by melt spinning, Int. J Hydr. Energy, 39 (2014) 3790-3798.

DOI: 10.1016/j.ijhydene.2013.12.139

[10] Information on http: /www. gatan. com/resources/scripts.

[11] D.R.G. Mitchell, T.C. Petersen, RDFTools: A software tool for quantifying short-range ordering in amorphous materials, Micr. Res. Tech0,. 75 (2012) 153-163.

DOI: 10.1002/jemt.21038

[12] MATLAB R2016b, The MathWorks Inc., Natick, MA, (2016).

[13] G.Y. Fan and J.M. Cowley, Auto-correlation analysis of high resolution electron micrographs of near-amorphous thin films, Ultramic., 17 (1985) 345-356.

DOI: 10.1016/0304-3991(85)90201-3

[14] S. Pfleiderer, D. G. A. Ball, I and R. C. Bailey Auto: a computer program for the determination of the two-dimensional autocorrelation function of digital images, Computers & Geosci., 19 (1993) 825-829.

DOI: 10.1016/0098-3004(93)90053-8

[15] X.J. Liu, et al., Atomistic mechanism for nanocrystallization of metallic glasses Acta Mat., 56 (2008) 2760-2769.

DOI: 10.1016/j.actamat.2008.02.019