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    A comparative study on the machinability of ?-type novel Ti29Nb13Ta4.6Zr (TNTZ) biomedical alloys under micro-milling operation
    (Elsevier Sci Ltd, 2023) Aslantas, Kubilay; Demir, Bilge; Guldibi, Ahmet Serdar; Niinomi, Mitsuo; Dikici, Burak
    beta-type Ti29Nb13Ta4.6Zr (TNTZ) alloy is a new-generation alloy that does not contain toxic/allergic elements. The alloys have low Young's modulus (-60 GPa) close to the cortical bone, providing excellent biocompatibility over familiar commercial CP Ti or Ti6Al4V ELI. Different macro/micro-machining methods can be used to obtain the final shape of Ti alloys and impact on the implant's bio ecosystem and performance. This study compared the micro-mill machining performance of the TNTZ alloys with commercial CP Ti and Ti6Al4V ELI. Machining ex-periments were performed under similar and different cutting speeds and constant feed rate conditions. In the study, cutting forces, surface roughness, burr size and tool wear were obtained. The results showed that the Fx cutting forces for TNTZ are about 3 and 2 times higher than for CP Ti and Ti6Al4V alloys, respectively. Depending on the increasing cutting distance, the surface roughness of CP Ti and Ti6Al4V materials followed a similar trend. However, the surface roughness values for TNTZ alloy are higher and decrease with increasing cutting distance. Burr widths for CP Ti and Ti6Al4V are similar, but the milling direction at which maximum burr occurs varies. In the TNTZ alloy, the burr width is about 3 times higher, and the burr occurred inside the slot, not at the edge of the machined slot. The predominant type of damage in milling Ti6Al4V and CP Ti materials is abrasive and adhesive. The dominant damage type in TNTZ alloy is chipping. Increasing the number of revolutions in TNTZ causes the cutting forces and burr width to increase.
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    Microstructure, mechanical properties, and corrosion resistance of an explosively welded Mg-Al composite
    (Keai Publishing Ltd, 2022) Acarer, Mustafa; Demir, Bilge; Dikici, Burak; Salur, Emin
    In this study, an attempt was made to manufacture an AZ31-Al5005 laminated composite by explosive welding. A mixture of ammonium nitrate (90%), fuel oil (5%), and TNT (5%) was used as the explosive. The detonation velocity of the explosive material was approximately 3100 m.s(-1). The microstructure and mechanical and corrosion properties of the joint were comparatively investigated. Microstructural characterisation of the joint was conducted by optical microscopy (OM), scanning electron microscopy with energy-dispersive spectroscopy (SEM-EDS), high-resolution transmission electron microscopy (HR-TEM), and X-ray diffraction (XRD). The mechanical properties were determined using micro-Vickers hardness, tensile, and Charpy impact tests. In addition, electrochemical tests were conducted on the AZ31-Al5005 laminated composite and the individual components to determine their corrosion resistance. The corrosion behaviours of the structures were determined in a 3.5% NaCl solution at room temperature using potentiodynamic scanning (PDS). The metallurgical structure and mechanical properties of the joints were within the acceptable limits. (C) 2021 Chongqing University. Publishing services provided by Elsevier B.V. on behalf of KeAi Communications Co. Ltd.