Wyniki 1-2 spośród 2 dla zapytania: authorDesc:"KRYSTIAN PRUSIK"

Transformations in liquid state and microstructure analysis in immiscible Fe60Cu20P10Si5B5 alloy

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The manufacture of the composite alloys is usually carried out by introducing the ex situ particles prior to casting [1÷3], or by the precipitation of in situ crystalline phase. The in situ particles can be formed by crystallization of the amorphous phase or precipitation of the crystalline phase during the casting process [4÷6]. A relatively new idea that can be helpful in improving the plasticity of the glassy matrix materials is the introducing of the soft crystalline phase into amorphous matrix using an immiscible alloy system. Production of the composite directly from melt using immiscibility is interesting because no additional heat treatment is required to produce the fine crystalline phase. There are reports on formation of two‑phased glassy composites in Ni-Nb-Y system [7, 8], Y-Ti-Al-Co system [9], Al-Pb-Ni-Y-Co [10], iron-based Fe-Cu-Ni-Si-Sn-B-Y [11] and Fe-Cu-Ni-P-Si-B [12] amorphous/crystalline composite. In the latter alloys, it was shown that the morphology of the composites can be changed through the variation of temperature prior to ejection. Phase transformations and structure development occurring in alloys processed in the liquid state is very vital for controlling the final microstructure and properties and as such should be better investigated and understood. In the Fe-Cu-Ni-P-Si-B alloys [12] the nickel content limited the miscibility gap to relatively narrow temperature range. Due to the good solubility of nickel both in iron and copper [13], it can be expected, that in the system without nickel e.g. Fe-Cu-Si-P-B, the miscibility gap will probably be broader and shifted to higher temperatures, and therefore, upon cooling, more complex crystallization microstructures can be formed. Furthermore, the Fe-P-Si-B system provides amorphous alloys with interesting magnetic properties [14, 15]. Therefore, taking into account the possibility of formation amorphous/crystalline composite, it is interesting to[...]

Structure and mechanical properties of Co-Ni-Ga ferromagnetic shape memory alloys

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The paper concerns the phase identification and structure analysis of alloys in wide range of their chemical composition. Basing on a crystallographic model, the structure of the martensite can be derived from the B2 structure and described as the BCT (Body Centered Tetragonal) lattice with c/a >1 or as L10 (Face Centered Tetragonal) structure with c/a < 1. The structure of the martensite stu[...]

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