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Investigations of TiO₂, Ti/TiO₂, and Ti/TiO₂/Ti/TiO₂ coatings produced by ALD and PVD methods on Mg-(Li)-Al-RE alloys substrates

Staszuk Marcin, Reimann Łukasz, Ściślak Aleksandra, Jaworska Justyna, Pawlyta Mirosława, Mikuszewski Tomasz, Kuc Dariusz, Tański Tomasz, Kříž Antonín

Bulletin of the Polish Academy of Sciences. Technical Sciences

2021

Vol. 69, nr 5

art. no. e137549

Magnesium alloys have recently become increasingly popular in many sectors of the industry due to their unique properties, such as low density, high specific strength, vibration damping ability along with their recyclability and excellent machinability. Nowadays, thin films have been attracting more attention in applications that improve mechanical and corrosion properties. The following alloys were used for the coated Mg-Al-RE and the ultra-light magnesium-lithium alloy of the Mg-Li-Al-RE type. A single layer of TiO2 was deposited using the atomic layer deposition ALD method. Multiple layers of the Ti/TiO₂ and Ti/TiO₂/Ti/TiO₂ type were obtained by the MS-PVD magnetron sputtering technique. Samples were investigated by scanning and a transmission electron microscope (SEM, TEM) and their morphology was studied by an atomic forces microscope (AFM). Further examinations, including electrochemical corrosion, roughness and tribology, were also carried out. As a result of the research, it was found that the best electrochemical properties are exhibited by single TiO2 layers obtained by the ALD method. Moreover, it was found that the Ti/TiO₂/Ti/TiO₂ double film has better properties than the Ti/TiO₂ film.

Struktura i właściwości mechaniczne walcowanych prętów ze stali C45

Bednarczyk Iwona, Tomaszewska Agnieszka, Kuc Dariusz, Krawczyk Aleksandra, Paterek Zygmunt, Zygmunt Karolina, Woźniak Dariusz, Hadasik Eugeniusz

Hutnik, Wiadomości Hutnicze

2019

Vol. 86, nr 8

228--232

W artykule zaprezentowano wyniki oceny makro i mikrostruktury oraz właściwości mechanicznych walcowanych prętów ze stali C45 z wsadów z ciągłego odlewania. Dokonano oceny makrostruktury na podstawie próby Baumana oraz głębokiego trawienia. Na podstawie badań makro i mikrostruktury wykazano, że przy wstępnym przerobie plastycznym wlewków drogą walcowania mogą wystąpić nieciągłości i wady wewnętrzne. Otrzymane wyniki właściwości mechanicznych na podstawie statycznej próby rozciągania, próby udarności, pomiaru twardości wskazują większy wpływ miejsca pobrania próbki niż stopień przerobu plastycznego, co może wynikać zarówno z jakości wlewków jak i warunków walcowania.

The paper presents the results of evaluation of the macro and microstructure as well as mechanical properties of rolled bars made from steel C45 from continuously cast stock. The macrostructure was examined using Baumann's method and deep etching. Based on the examination of the macro and microstructure, it was shown that discontinuities and internal defects may occur during initial plastic processing of ingots by rolling. Mechanical properties determined from the static tensile test, impact test and hardness measurements indicate a greater influence of the sampling site than of the degree of plastic processing, which may results from both the quality of ingots and the rolling conditions.