China
Africa
Explore chapters and articles related to this topic
Lubricated Tribology of Lightweight MMCs
Published in Suneev Anil Bansal, Virat Khanna, Pallav Gupta, Metal Matrix Composites, 2023
Harpreet Singh, Hiralal Bhowmick
Titanium, magnesium, copper, and aluminum-based composites are among the most widely fabricated composites targeted for certain applications. For example, owing to the high-temperature stability, titanium is used in the compressor blades and disks of aero engines. Magnesium-based composite can be a potential candidate for gudgeon pins and spring caps. Its low density (one-third density of Al) and coefficient of thermal expansion, along with the high stiffness property makes it suitable for use in aerospace applications. It offers a unique combination of low density and excellent machinability. However, the absolute strength of magnesium alloys is much lower compared with aluminum alloys (Warren et al., 2004).
Metals and alloys for lightweight automotive structures
Published in S. Thirumalai Kumaran, Tae Jo Ko, S. Suresh Kumar, Temel Varol, Materials for Lightweight Constructions, 2023
The quantity of magnesium utilized in the automobile sector is anticipated to rise by at least 300% over the next 8 to 10 years. Increasing the applications of magnesium alloy in each automobile will help the world meet its greenhouse gas reduction targets. Recent advancements in the manufacturing of magnesium alloys have expanded their potential for use in the automobile sector. The present batch of magnesium alloy automobile components is mostly produced using the above-mentioned casting techniques. To extend Mg’s use in the automobile sector in the long run, more research into the forming processes of Mg alloys is required.
Wheels and Tyres
Published in G. K. Awari, V. S. Kumbhar, R. B. Tirpude, Automotive Systems, 2021
G. K. Awari, V. S. Kumbhar, R. B. Tirpude
These wheels are made of magnesium and aluminium, the main purpose of which is to reduce weight. Compared to steel, magnesium alloy is 50% lighter but has similar strength. Reduced weight enhances fuel economy. Light alloys are better conductors of heat than steel, so that they transfer any heat generated by the tyre or brake more quickly, which improves tyre life. Magnesium alloys exhibit very good fatigue properties and excellent resilience, due to which they are capable of resisting vibrational and shock loading better than both aluminium alloy and steel. These wheels are manufactured with a single-piece rim and disc. As regards the cost, light alloy wheels are more expensive to manufacture than pressed steel wheels. Aluminium alloy wheels are cheaper than magnesium alloy wheels. Usually aluminium alloy wheels are preferred for passenger cars and trucks, and magnesium alloy wheels for sports and racing cars.
Influence of titanium particulate reinforcement on microstructural evolution and mechanical performance of AZ91 magnesium matrix surface composite developed through friction stir processing
Published in Canadian Metallurgical Quarterly, 2023
Ketha Jaya Sandeep, Atul Kumar Choudhary, Ilyas Hussain, R.J. Immanuel
Compared to steel and aluminium alloys, magnesium alloys are lightweight materials with a high strength to weight ratio [1]. In the aerospace, transportation, and electronics industries, heavyweight metallic components can thus be replaced with parts and structures built of magnesium alloys [2,3]. Various attempts were made in the past to create ceramic. particles/magnesium alloy composites to improve the mechanical properties of magnesium alloys [4–6]. Metal matrix composites (MMCs) have elevated to the status of one of the most significant classes of engineering materials in use today. In recent years, MMCs have attracted a lot of study attention. Magnesium matrix composites (MMCs) with particulate reinforcement are thought to be the lightest metallic-based composites and a potential alternative for aluminium-based composites in a variety of automotive and other industry components [7,8]. The common practice is to choose the reinforcing particles from anyone type of ceramics, such as borides, carbides, nitrides and oxides. Ceramic particulates such as Mg2Si [9], ZrB2 [10], AlCu [11], SiC [12], SiO2 [13], ZrC [14], ZrO2 [15] and TiC are employed as reinforcement for MMCs, greatly enhancing their strength. The rigidity of the ceramic particles to tensile loading, however, caused the composites to suffer a substantial loss in ductility [16,17]. The ability to strengthen MMCs and get over the restrictions of ceramic particulates is provided by hard metallic particulates with higher melting temperatures, such as titanium, nickel, tungsten and molybdenum, among others [18,19].
Preparation process of magnesium alloys by complex salt dehydration-electrochemical codeposition
Published in Materials and Manufacturing Processes, 2019
Currently, as weight reduction requirement for vehicle body is becoming the focus of attention, the applications of magnesium alloys are growing exponentially due to their attractive performances such as excellent damping capacity, high-specific rigidity, and low density.[1–5] At present, almost all the magnesium alloys are produced by mixing various alloying metal at an elevated temperature. This way of producing magnesium alloys has many shortcomings, such as complex production procedure, unhomogeneous alloy composition, and severe metal burning loss.[6,7] These shortcomings can be overcome by adopting the electrochemical codeposition method.[8,9] The electrochemical codeposition method has the following advantages.[10] First, multicomponent magnesium alloys can be directly produced by electrolyzing the alloying element-containing chloride molten salt, which will greatly simplify the production process. Secondly, magnesium and the other alloying elements are mixed on the surface of the cathode at the atom level, which results in better uniformity of alloying elements. Thirdly, much less alloying elements are burned during the heating process because of the relatively lower operating temperature (680–750°C) and the protection of molten salts. However, the complex production process of high-purity anhydrous MgCl2 has severely impeded the production of magnesium alloys by electrochemical method.[11,12]
Mechanical properties and performances of contemporary drug-eluting stent: focus on the metallic backbone
Published in Expert Review of Medical Devices, 2019
Ply Chichareon, Yuki Katagiri, Taku Asano, Kuniaki Takahashi, Norihiro Kogame, Rodrigo Modolo, Erhan Tenekecioglu, Chun-Chin Chang, Mariusz Tomaniak, Neville Kukreja, Joanna J. Wykrzykowska, Jan J. Piek, Patrick W. Serruys, Yoshinobu Onuma
The advantage of magnesium as a material for stents is its biocompatibility to human tissue [48]. Magnesium has antithrombotic effect due to its electronegativity which is attractive as a material for coronary scaffold [49]. Magnesium usually serves as an alloying agent. The strength and physical features of magnesium alloy are modified by various elements such as aluminum, calcium, manganese or rare earth elements added to pure magnesium. The WE43-type alloy of Magnesium was initially used as medical devices. The tensile strength of WE43-type alloys is suitable and better than polymeric biodegradable materials. However, the ductility and elastic modulus are lower than durable metallic materials (Table 1). In addition, magnesium has relatively low corrosion resistance and the biodegradation time can be faster than the optimum treatment time [50,51]. Adding elements such as Zinc and Manganese or purification of the alloy may improve corrosion resistance of WE43-type alloy [52]. The Magnesium alloy used in current vascular scaffold provides high-temperature stability, deformation resistance, 12-month degradation process and light weight [52]. The low thrombogenicity of magnesium scaffold has been demonstrated in an ex-vivo animal arteriovenous shunt model [53]. Although magnesium scaffolds have shown promising results in clinical studies [54], using bioresorbable scaffolds (BRS) outside of clinical studies are not currently recommended [55].