Dwumiesięcznik ISSN 0208-6247, e-ISSN 2449-9889 - rok powstania: 1980 Czasopismo Federacji Stowarzyszeń Naukowo-Technicznych NOT (FSNT NOT)
The die forging is a primary method of the machine parts manufacturing from non-alloy and alloy steels. To improve their properties, forged elements from non-alloy steels are usually normalized, what leads to the grain refinement. Forged elements made from alloy steels have to be soft annealed or tempered at high temperature, before their mechanical treatment, and in ready state, quenched and tempered in high temperature, with dimension correction by machining — especially grinding and finishing. więcej »Characterization of low-temperature nitrided NiTi shape memory alloy DOI:10.15199/28.2019.3.3
Józef Lelątko Zdzisław Lekston Michał Tarnowski Dariusz Chrobak Bożena Łosiewicz Tomasz Goryczka Tadeusz Wierzchoń
1. INTRODUCTION Shape memory alloys (SMAs) belong to a class of the shape memory materials, which posses ability to “memorise" or retain their previous form when subjected to certain stimulus such as thermomechanical or magnetic variations. Due to their unique and superior properties, SMAs have drowned significant attention and interest in recent years in broad range of commercial applications. Especially, well-known in this field is nickel-titanium alloy (NiTi), which is also known as NiTiNOL. Invented by William Buehler and Frederick Wang in 1962 NiTi alloy has found wide engineering and technical applications in numerous commercial fields, such as: consumer products, automotive, aerospace, mini actuators, micromechanical systems, robotics and biomedical [1, 2]. In field of aerospace, a family of high force release devices called the “Frangibolt¨, an array of fast acting Pinpullers, a range of innovative Ejector Release Mechanisms (ERMs), and a host of other SMA Actuators have been known . The NiTi-based shape memory alloys are preferable for most of these applications due to their high mechanical and corrosion properties as well as the stability of the effect. However, there are some application areas that require improvement in surface hardness as well as an abrasion resistance. Therefore, studies were done in order to improve these properties through the use of various method of surface treatment, which form e.g. layers of titanium oxide, titanium nitride, carbon coatings such as DLC (diamond like carbon) or NCD (nanocrystalline diamond) and ceramic layers. The methods include: electrochemical oxidation, ion implantation, RFCVD, glow discharge and laser treatment [4÷11]. The limitation in the application of these surface treatments is the temperature of the process, which may negatively affect the shape memory effects [5, 11]. The most of these methods, e.g. nitriding, have been carried out at high tempera więcej »22nd International Conference "Advanced Materials and Technologies AMT'2019"
The 22nd International Conference AMT'2019 took place in Bukowina Tatrzańska in the Grand Stasinda center on 9-12.06.2019. The organizers of the conference were: AGHFaculty of Metal Engineering and Computer Science, Polish Materials Science Society, Materials Science Committee of the Polish Academy of Sciences and Joint Institute for Nuclear Research. Conference Physical Metallurgy and Materials Science Conference: Advanced Materials and Technologies AMTʹ2019 is a cyclic conference held every three years and organized by the Polish Materials Science Society and various science centers in Poland working in the discipline of Materials Science. The original name of the conference is the Physical metallurgy (Metaloznawcza) conference, and the current name has been in force since 1992. This year the AMT'2019 conference was attended by 213 participants from 14 countries such as Poland, Slovakia, Russia, Lithuania, Kazakhstan, Austria, Germany, Canada, USA, Switzerland, Japan, France, Norway, and Hungary. The most numerous group were Polish researchers representing all scientific centers in which the discipline of material engineering is developed (Figure 1). The conference will raise issues of research in a wide range of materials like: - metals and alloys, - ceramics, - polymers and composites, - magnetic and electronic materials, - amorphous materials, - biomaterials, - thin films, - materials and structures for nanotechnology. As a part of the conference, 19 invited speaker lecture, 42 oral presentation, 32 oral presentation in Young researchers' sessions and 84 posters were presented. Our invitation as Invited Speaker were accepted by: prof. Kenji Matsuda presenting a lecture “Existence of universal cluster inside prec więcej »pH-dependent composite coatings for controlled drug delivery system - Review DOI:10.15199/28.2019.3.1
Due to the growing phenomenon of population aging, the number of people who need replacing or repairing damaged tissues by using biomaterials increases. The number of implanted hip joint implants or dental implants is also increasing every year . Metallic biomaterials are the most suitable for replacing hard tissues of the human body. Among them, stainless steels, cobalt alloys, titanium, and its alloys can be distinguished. Due to the highest biocompatibility, corrosion resistance and similar mechanical properties to human bones, titanium alloys are nowadays most often used as materials for implants . The surface of metallic biomaterials is subjected więcej »