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Temperature dependence of the microhardness of coatings from amorphous alloy powders Fe—Cr—B—Si and Fe—Cr—Ni—Co—Mo—B—Si in the range of 293—1100 K

С.І.Чугунова,
 
О.А.Голубенко,
 
І.В.Гончарова*,
 
А.В.Самелюк,
 
О.І.Лук`янов,
 
В.Х.Мельник
 

Інститут проблем матеріалознавства ім. І. М. Францевича НАН України , Київ
i.goncharova@ipms.kyiv.ua
Usp. materialozn. 2025, 10/11:58-65
https://doi.org/10.15407/materials2025.10-11.058

Анотація

The structure and mechanical behavior of coatings produced from amorphous powders based on Fe—Cr—B—Si and Fe—Cr—Ni—Co—Mo—B—Si alloys were studied. Surface SEM analysis of the coatings revealed that their structure is homogeneous and consists of a dense conglomerate of spherical particles, with sizes ranging from approximately 15 to 30 μm, which corresponds to the particle size of the amorphous powders in their initial state. Analysis in characteristic X-ray emanation of elements containing in the coating showed that the elements comprising the coatings are fairly uniformly distributed throughout the material. At room temperature, the plasticity characteristic δH and yield stress σS of the coatings were determined from hardness measurements. The hardness of the Fe—Cr—B—Si coating is approximately 9,5 GPa, which is comparable to the hardness of amorphous metal composite tapes of the same composition, produced by the melt-spinning method, with δH ≈ 0,62 and σS ≈ 8,3 GPa. The addition of Ni and Co to the Fe—Cr—B alloy system led to an increase of coating plasticity δH ≈ 0,74, along with a decrease in hardness to HV ~6,5 GPa and in yield stress to σS ≈ 5,1 GPa. The temperature dependence of hardness was examined over the range of 293—1100 K using a local loading method. The resulting hardness temperature curves displayed non-monotonic behavior typical of amorphous materials. With increasing temperature, hardness gradually decreased, reaching approximately 2 GPa at 1100 K for both coating compositions. The effect of the degree of deformation on the hardness of the amorphous powder-based coatings was also investigated. Analysis of the "Meyer hardness, HM – total deformation under the indenter, εt" curves revealed that deformation occurs in two distinct stages. During the first stage (up to εt ≈ 8—10%), strain hardening is observed. Beyond this point, further deformation has little effect on hardness, which is typical of amorphous materials.

Keywords: amorphous metallic alloys, coatings, temperature, indentation, mechanical properties, deformation.


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