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Author: Jahani, Babak

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    Development of an Advanced Composite Material Consisting of Iron Matrix Reinforced with Ultra High Temperature Ceramic Particulate (TiB2) with Optimum Properties
    (North Dakota State University, 2016) Jahani, Babak
    This study was intended to investigate the mechanical properties and microstructure of iron based composite reinforced by ultra high temperature ceramics fabricated by powder metallurgy technique. The fabrication parameters were optimized and composite samples with different volume fraction of TiB2 were fabricated and were subjected to different mechanical tests. The results indicated improving in mechanical properties of Fe-TiB2 composites by increasing the volume fraction of TiB2 up to 20 vol%. More TiB2 particles didn’t improve the mechanical properties of composite, instead adversely affected it due to increasing the chance of agglomeration and porosity in entire microstructure. Another finding showed the twofold characteristic of TiB2 on mechanical properties of composite via increasing the hardness and decreasing the bulk density of composite. Finite Element Analysis (FEA) have also been performed on microstructural based developed models to simulate failure of composites. Numerical simulation results could verify the experimental results.
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    The Effects of Surface Roughness on the Functionality of Titanium Based Alloy Ti13Zb13Zr Orthopedic Implants
    (North Dakota State University, 2021) Jahani, Babak
    In this study, the effects of surface roughness on the wettability, cell attachment, and mechanical properties of titanium-based Ti13Nb13Zr orthopedic implants have been investigated. The aim of this multidisciplinary research was to find an optimum range of surface roughness for Ti13Nb13Zr orthopedic implants that could maximize the attachment and the proliferation of cells and improve the wettability of the surface, without adversely affecting the mechanical strength of the implants. There have been some published research works that support the existence of relations between roughness and the functionality of implants, but still, an optimum roughness that can satisfy all of the orthopedic requirements, either is not fully studied or not published. It was seen that the performance of orthopedic implants depends on multiple paradoxical parameters. The results of this study on Ti13Nb13Zr show, even though increasing the value of surface roughness can increase the initial phase of cell attachment onto the surface of Ti13Nb13Zr implants, other major functions such as wettability and mechanical properties can be influenced adversely. Through an experimental methodology, this study proposes an optimum range of roughness, which meets all three major functions of cell attachment, mechanical properties, and wettability. In respect to the recent serious health concerns reported over the implants made of Ti6Al4V which is a common material in the implant industry, scientists and researchers are currently working to introduce a better biomaterial. In this study, Ti13Nb13Zr which is a new and advanced titanium-based biomaterial with improved biocompatibility and more desired mechanical properties was selected and studied. The reason for this selection backs to the fact that Ti13Nb13Zr does not release toxic ions (such as Al and V ions) and its mechanical properties are closer to the bone in comparison to many titanium alloys such as Ti6Al4V.