چكيده به لاتين
Various industries are looking for new materials with improved properties as a suitable alternative to conventional materials. Titanium-based composites have been widely used in various industries due to their high strength-to-weight ratio, excellent mechanical properties, and medical applications. Among the many composite fabrication methods, the frictional stir process is a method of fabricating metal-based composites with particle reinforcements studied in various industrial and research institutes. The environmentally friendly and controllable method is used to improve the mechanical properties and corrosion of materials. This research aims to produce a surface composite using the frictional method to investigate the produced samples' microstructural changes, morphology, and mechanical properties. Therefore, the effect of adding zinc oxide (ZnO) particles on titanium grade 5 (Ti-6Al-4V) and friction stir process was investigated separately. In particular, the structural and abrasive properties of titanium have been investigated. Optimal travers and rotational velocities were obtained using changes in parameters. Mechanical properties, microstructure, and particle dispersion of the prepared composite were investigated. The results of the microstructure study showed a uniform distribution of powder in the field. The α-to-β-titanium transition of titanium occurred at high process temperatures and β-spherical particles formed in the α-needle-shaped background. During the transformations that took place, the whole structure formed towards β. The addition of zinc oxide powder improved the mechanical properties such as abrasion, microhardness, strength, and structure formation towards the β phase. To evaluate the composite, tensile, abrasion, and microhardness tests were performed to evaluate the obtained mechanical properties of the composite. By performing a pass friction process on titanium and performing tensile and microhardness tests, the titanium's final strength was increased up to 1000Mp, which increased by 15% base. After the second pass, the final strength increased to 1100Mp, which indicates an increase of about 25% compared to the base metal. The microhardness test results showed an increase in the hardness of the sample from 295HV base metal to 392HV for the composite area. The improvement of wear properties due to the interaction of zinc oxide powder and stir friction was also significant, so a significant increase was observed compared to the base metal.
