The effect of ceramic reinforcement processed by powder metallurgy on mechanical performance in Ti6AL4V based patterned structures produced by additive manufacturing method

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Thesis Type: Postgraduate

Institution Of The Thesis: Gazi University, Fen Bilimleri Enstitüsü, Turkey

Approval Date: 2023

Thesis Language: Turkish

Student: Hasan YALÇIN

Supervisor: Gökhan Küçüktürk

Open Archive Collection: AVESIS Open Access Collection

Abstract:

Nowadays, Additive Manufacturing is a technology that was initially used for rapid prototyping. However, it has recently started to be a technology that is an alternative to traditional manufacturing methods. Especially the parts produced with metal additive manufacturing technologies are used in important sectors such as medicine, aerospace and aviation. In the electron beam melting method, the metal powders are melted with the electron beam and the production is made layer by layer. In this thesis, a study was conducted on the improvement of the mechanical properties of the samples produced in electron beam melting systems. For this purpose, composite structures were obtained by reinforcing ceramic particles from biocompatible Ti6Al4V material with powder metallurgy technique into compact matrix structures with hollow geometrical patterns by additive manufacturing. Hardness measurement and bending strength tests were carried out on these composite structures. Microstructural analyses of the produced composite structures were evaluated with SEM and optical imaging, and EDX elemental analysis methods. As a result of the production of composite materials, when the interfaces between the matrix and the ceramic reinforcement were examined, good sintering was observed. The effect of the reinforcement element ceramic, which is included in the patterns in different geometries created in the structure of different geometric patterns in the matrix metal with additive manufacturing, on the performance of the composite structure has been examined with tests and visualizations. As a result, it was observed that the mechanical strength was higher in six different geometric patterns, generally in round forms. It has been seen from the microphotographs that a homogeneous sintering band was obtained by obtaining good sintering in the geometric pattern structure. Compared to the reference sample, the best improvement in mechanical strength was achieved in circular form B2 samples with an increase of 21%.

Key Words : Additive manufacturing, electron beam melting, metal matrix composites, Ti6AL4V