Abstract
The influence of the mass concentration of Ag on properties of Cu-Ni alloys is investigated. The effect of silver addition on the structure and properties of Cu-2Ni-1Si alloys is determined. The scientific aim of this research is to determine how the addition of silver affects the mechanisms of strengthening silver-modified supersaturated, deformed, and aged Cu-2Ni-1Si alloys. The applied thermo-derivative analysis has allowed us to determine a range of the temperature values for the beginning and the end of crystallization, the phases and eutectics, and the effects of the modification on the solid fraction of the solidified alloy. In addition to the crystallization kinetics, the microstructure morphology, mechanical properties under real operating conditions, and the electrical conductivity have also been investigated. Moreover, the conducted research includes the impact of heat treatment and plastic deformation on the alloy structure and considers the type, share, and distribution of the intermetallic phases and structural stresses caused by coherent phases, as well as the effect of dislocations in the reinforcing phases during aging. Electron microscopy (SEM), micro-area analysis (EDS), optical microscopy, hardness measurements, and conductivity of the tested alloys are utilized to comment on these properties.
Highlights
The drive for industrial advancement and new technologies forces the development of materials engineering and the continuous improvement of existing materials, as well as the development of completely new classes of high-quality materials [1,2,3,4]
The investigated alloys were subjected to heat treatment and subsequent cold plastic deformation (Figure 1)
Tests using X-ray scanning transmission electron microscopy (STEM) with the application of chemical composition analysis with an EDS detector confirm the occurrence of phase Ni2Si in the Cuchemical composition analysis
Summary
The drive for industrial advancement and new technologies forces the development of materials engineering and the continuous improvement of existing materials, as well as the development of completely new classes of high-quality materials [1,2,3,4]. Operational durability and reliability are a priority and drive the search for materials with more favorable and precise sets of features, such as high and stable mechanical, electrical, and/or thermal properties during operation. With the development of both new technologies and new possibilities for conducting scientific research, the creation of such materials is becoming more facile. Thermal-derivative analyses of solidifying alloys aim to determine the temperature of phase transitions during the cooling processes. Thermal-derivative analysis (TDA), with the use of the UMSA MT5 platform, measures the temperature change during solidification of the molten metal
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