Influence of physicochemical melt treatment on structure and properties of AK7ch alloy microalloyed with Sr-Sc and Ti-B-Sr complexes
DOI:
https://doi.org/10.15802/tpm.2.2025.04Keywords:
silumin, microalloying, hydrogen treatment, thermotemporal treatment, deformability, corrosion propertiesAbstract
Purpose. The aim of research is to determine the features of structure formation and property enhancement in the AK7ch alloy under the influence of microalloying with complex modifiers Sr-Sc and Ti-B-Sr, as well as physicochemical treatment in the liquid state. Methodology. The object of study was the AK7ch alloy of the base composition and microalloyed with Sr-Sc and Ti-B-Sr complexes in both the as-cast state and after hydrogen and thermotemporal melt treatments. Structural formation was investigated using metallographic analysis. The ultimate deformability was determined by an improved method for assessing the limiting deformation degree during rolling of wedge-shaped samples. Corrosion resistance, including general and intergranular corrosion susceptibility, was assessed using standard testing methods. Results. It was found that the combined physicochemical effect of microalloying with Sr-Sc and 20-minute hydrogen melt treatment increased the deformability of the AlSi7 alloy by 60%. Ti-B-Sr addition and 30-minute thermotemporal melt treatment increased deformability by 46% compared to the original as-cast alloy. It was also established that microalloying with Ti-Sr-B and isothermal treatment for 30 minutes significantly enhance the corrosion resistance of the AK7ch alloy. Scientific novelty. The study proves the effectiveness of microalloying with Sr-Sc and Ti–B–Sr complexes in combination with hydrogen and thermotemporal melt treatments for improving the deformability of AK7ch alloy compared to the base composition. The positive effect of such treatments on the alloy’s general corrosion resistance was also confirmed. Practical significance. The research provides effective methods for enhancing the technological deformability and corrosion resistance of AK7ch aluminum alloy through microalloying with Sr–Sc and Ti–B–Sr complexes in combination with hydrogen or thermotemporal melt treatment. The proposed approaches significantly improve the alloy’s structure, which promotes increased corrosion resistance and overall reliability of finished products, especially in critical components used in mechanical engineering, aviation, and transport industries.
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