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Structural state and fracture strength upon friction of boron-containing alloys and coatings with an amorphous structure

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Abstract

The structural condition and wear resistance of electrochemical Co-B and Ni-B coatings with different amounts of boron, as well as Ni-Co-Fe-Cr-Mo-Si-B and Ni-Fe-Si-B amorphous alloys obtained by rapid solidification from the melt have been studied. It has been found that in Co-B and Ni-B coatings with a boron concentration less than 8 at %, there is formed a solid solution of boron in the matrix phase, and the coatings are characterized by a high fracture strength upon friction. At a boron concentration from 8 to 15 at %, there is formed in the coatings a metastable amorphous structure with a decreased wear resistance. An increase in the B concentration to 20 at % stabilizes the amorphous structure of coatings, which leads to an increase in their fracture strength. A conclusion is made that during friction interaction at the surface of amorphous layers there are formed crystalline layers, which are subject to tensile stresses and are characterized by a decreased fracture strength. The difference in the wear resistance of the alloys studied is explained by a different deformation and thermal stability of the amorphous structure of the material.

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Authors and Affiliations

  1. Joint Institute of Mechanical Engineering, National Academy of Sciences of Belarus, ul. Akademicheskaya 12, Minsk, 220072, Belarus

    V. A. Kukareko

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  1. V. A. Kukareko
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Original Russian Text © V.A. Kukareko, 2011, published in Fizika Metallov i Metallovedenie, 2011, Vol. 111, No. 3, pp. 304–314.

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Kukareko, V.A. Structural state and fracture strength upon friction of boron-containing alloys and coatings with an amorphous structure. Phys. Metals Metallogr. 111, 294–303 (2011). https://doi.org/10.1134/S0031918X11020104

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  • DOI: https://doi.org/10.1134/S0031918X11020104

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