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Studies on the influence of AlTi5B1 modifier on the structure and properties of AlCuMg alloys

Ściężor Wojciech, Kowal Radosław, Franczak Krystian, Grzebinoga Justyna, Kwaśniewski Paweł, Kiesiewicz Grzegorz

Acta Innovations

2021

no. 38

37--48

New materials used in various industries require sufficiently high mechanical properties, fine-grained structure and ease of metal forming while minimizing production costs. For this reason, work is being carried out to develop new groups of alloys that make it possible to increase the strength of the obtained components while reducing their weight, and thus reducing production costs. This article focuses on two aluminium-based alloys with different content of alloying additives: copper and magnesium i.e., AlCu3Mg3 and AlCu4.5Mg6, which were produced by metallurgical synthesis. The as-cast alloys were characterized for their basic physical, mechanical and electrical properties and were subjected to structural analysis. In the next stage, the alloys were modified with 100, 500, 1000 and 2000 ppm of titanium and then their hardness, electrical conductivity and density were tested. Samples were also subjected to microstructural analysis. The obtained results allowed to examine the evolution of the AlCuMg alloy properties depending on the content of alloy additives and the amount of used modifier.

Research of mechanical and electrical properties of Cu–Sc and Cu–Zr alloys

Franczak Krystian, Kwaśniewski Paweł, Kiesiewicz Grzegorz, Zasadzińska Małgorzata, Jurkiewicz Bartosz, Strzępek Paweł, Rdzawski Zbigniew

Archives of Civil and Mechanical Engineering

2020

Vol. 20, no. 1

390--404

The research paper presents the impact of the scandium additive and various conditions of the heat treatment on copper mechanical, electrical and heat resistance properties. The performed research works included manufacturing of CuSc0.15 and CuSc0.3 alloys through metallurgical synthesis with the use of induction furnace and following crystallization in graphite crucibles at ambient temperature. Additionally, a CuZr0.15 alloy was produced as a reference material for previously syn-thesized Cu–Sc alloys. During research, the selection of heat treatment for the produced materials was conducted in order to obtain the highest mechanical–electrical properties ratio. Materials obtained in such a way were next subjected to thermal resistance tests. Parameters of thermal resistance test included temperatures from the range of 200–700 °C and 1 h of anneal-ing time. The research has shown that CuSc0.15 and CuSc0.3 alloys have higher heat resistance after their precipitation hardening compared to the Cu–Zr alloy. The paper also presents microstructural research of the produced materials, which showed that alloying elements precipitates are mainly localized at the grain boundaries of the material structure.

Badania zanieczyszczeń złomów przewodów jezdnych oraz lin nośnych przed i po procesie ich syntezy metalurgicznej

Sadzikowski Michał, Noga Piotr, Kiesiewicz Grzegorz, Ściężor Wojciech, Maleta Marcin

Rudy i Metale Nieżelazne Recykling

2019

R. 64, nr 4

26--34

Transport kolejowy dla wielu wysoko rozwiniętych państw świata stanowi cenną arterię transportową, pasażerską oraz towarową. Ciągły wzrost gospodarczy determinuje wszystkich użytkowników oraz osoby odpowiedzialne za stan techniczny ogólnie rozumianej trakcji kolejowej do stałego monitorowania, unowocześniania i utrzymywania w dobrym stanie technicznym poszczególnych magistrali kolejowych. W nurt tych prac wpisują się badania prowadzone na Wydziale Metali Nieżelaznych, dotyczące możliwości ponownego zagospodarowania wyeksploatowanych już elementów górnej sieci trakcyjnej do wytworzenie nowego osprzętu górnej sieci trakcyjnej. W kolejnych etapach publikowanych wyników badań skupiono się na identyfikacji zanieczyszczeń powierzchniowych występujących na materiale pozyskanym do badań, podjęto się określenia grubości zalegającej powłoki zanieczyszczeń, a także przeprowadzono analizę jej składu chemicznego. Końcowym etapem zaprezentowanych badań był zrealizowany proces topienia i krystalizacji złomów lin nośnych oraz przewodów jezdnych pochodzenia trakcyjnego w celu określenia rodzaju i poziomu zanieczyszczeń występujących w osnowie miedzi.

Among the highly developed countries all around the world the railway transport is a valuable transport artery both passenger and freight. Continuous economic growth forces all users and people responsible for the electric railway traction to continuously monitor, modernize and maintain every individual railway line in good technical condition. These works among others include research studies carried out at the Faculty of Non-Ferrous Metals regarding the possibility of recycling elements of the overhead traction network showing signs of operational wear and tear to manufacture new equipment for the overhead traction network. The next stages of the published research data include the identification of surface impurities occurring in the material obtained for the tests, determining the thickness of the remaining impurities and analyzing its chemical composition. The final part of the presented research was the process of melting and crystallizing the scraps of carrying ropes and overhead contact lines in order to determine the type and level of impurities occurring in the copper matrix.