Metals, Vol. 14, Pages 539: A Study on Prediction of Size and Morphology of Ag Nanoparticles Using Machine Learning Models for Biomedical Applications Metals doi: 10.3390/met14050539 Authors: Athira Prasad Tuhin Subhra Santra Rengaswamy Jayaganthan The synthesis of silver nanoparticles (AgNPs) holds significant promise for various applications in fields ranging from medicine to electronics. Accurately predicting the particle size during synthesis is crucial for optimizing the properties and performance of these nanoparticles. In this study, we compare the efficacy of tree-based models compared ..read more

Metals, Vol. 14, Pages 540: Effect of Force and Heat Coupling on Machined Surface Integrity and Fatigue Performance of Superalloy GH4169 Specimens Metals doi: 10.3390/met14050540 Authors: Xun Li Ruijie Gou Ning Zhang GH4169 is one of the key materials used to manufacture high-temperature load-bearing parts for aero-engines, and the surface integrity of these parts in service conditions significantly affects their high-temperature fatigue performance. Under a coupling effect of high temperature and alternating load, the evolution process of the machined surface integrity index of superalloy GH4 ..read more

Metals, Vol. 14, Pages 541: Revealing the Enhancement Mechanism of Laser Cutting on the Strength–Ductility Combination in Low Carbon Steel Metals doi: 10.3390/met14050541 Authors: Jie Chen Feiyue Tu Pengfei Wang Yu Cao The strength–ductility mechanism of the low-carbon steels processed by laser cutting is investigated in this paper. A typical gradient-phased structure can be obtained near the laser cutting surface, which consists of a laser-remelted layer (LRL, with the microstructure of lath bainite + granular bainite) and heat-affected zone (HAZ). As the distance from ..read more

Metals, Vol. 14, Pages 542: Al and A356 Alloy Foam Castings Modified with Low Concentrations of Nano-Sized Particles: Structural Study and Compressive Strength Tests Metals doi: 10.3390/met14050542 Authors: Rositza Dimitrova Tatiana Simeonova Boyko Krastev Angel Velikov Veselin Petkov Valentin Manolov Aluminum and A356 alloy foam castings are produced using a melt-foaming method. Prior to foaming, the melt is modified with nano-sized particles (SiC, TiN, or Al2O3). The nano-sized particles are mixed with micro-sized Al particles, which are ultrasonically treated and hot-extruded. Thus, the so ..read more

Metals, Vol. 14, Pages 537: Directed Energy Deposition of Metal Alloys Metals doi: 10.3390/met14050537 Authors: Joel Andersson Directed energy deposition (DED) stands as an advancement in material utilization, facilitating the production of highly precise near-net shape components using wire and powders ..read more

Metals, Vol. 14, Pages 538: Cytotoxicity, Corrosion Resistance, and Wettability of Titanium and Ti-TiB2 Composite Fabricated by Powder Metallurgy for Dental Implants Metals doi: 10.3390/met14050538 Authors: Ali Mohammad Ali Aljafery Abdalbseet A. Fatalla Julfikar Haider Objectives: Orthopedics and dentistry have widely utilized titanium alloys as biomaterials for dental implants, but limited research has been conducted on the fabrication of ceramic particle-reinforced Ti composites for further weight reductions. The current study compared titanium–titanium diboride metal composit ..read more

Metals, Vol. 14, Pages 527: The Effect of Ultrafine-Grained (UFG) Structure Formed by Equal-Channel Angular Pressing in AA7075 on Wear and Friction in Sliding against Steel and Ceramic Counterbodies Metals doi: 10.3390/met14050527 Authors: Andrey V. Filippov Sergei Y. Tarasov Ekaterina O. Filippova The mechanical characteristics and sliding friction behaviors of AA7075 samples were studied in regard to structural states formed in them by ECAP and depending on the ECAP pass number. In addition, the effect of a counterbody’s material on the tribological characteristics of the sampl ..read more

Metals, Vol. 14, Pages 532: Wear Resistance Evaluation of Self-Fluxing Nickel-Based Coating Deposited on AISI 4340 Steel by Atmospheric Plasma Spray Metals doi: 10.3390/met14050532 Authors: Francisco C. Monção Felipe R. Caliari Filipe E. Freitas Antônio A. Couto Arnaldo Augusto Carlos R. C. Lima Marcos Massi Materials with enhanced wear resistance are constantly in high demand. Nickel-based self-fluxing materials deposited by atmospheric plasma spraying (APS) have feasible wear resistance performance. This study aimed to evaluate the results of a nickel-based self-fluxing alloy coating deposit ..read more

Metals, Vol. 14, Pages 533: Effect of TiB2 Addition on the Microstructure and Mechanical Properties of Laser-Directed Energy Deposition TiAl Alloy Metals doi: 10.3390/met14050533 Authors: Yancheng Yang Yi Hu Hongyan Chen Yu Li Jiawei Wang Xu Cheng Haibo Tang Xianzhe Ran Dong Liu The microstructure characteristics of TiAl alloy prepared by laser-directed energy deposition (L-DED) are coarse columnar grains parallel to the building direction, which results in serious mechanical properties and anisotropy and limits its application. In the present study, TiB2 can be used as an effective grain refi ..read more

Metals, Vol. 14, Pages 535: Microstructural Evolution and Tensile Properties of Al-Si Piston Alloys during Long-Term Thermal Exposure Metals doi: 10.3390/met14050535 Authors: Feng Xia Xiongbo Dong Jianli Wang Hongbo Duan Zhijun Ma Minxian Liang The present study investigated microstructural evolution and changes in tensile properties of an Al-Si piston alloy subjected to thermal exposures at 250 and 350 °C for 150, 300, and 500 h. Microstructural and nanoscale precipitates were characterized using a combination of high-angle annular dark field-scanning transmission electron microsc ..read more