Dr. Fraser, Ohio Regents Eminent Scholar and Professor, is the director of the Center for Accelerated Maturation of Materials (CAMM). He graduated from the University of Birmingham (UK) with the degrees of B.Sc. (1970) and Ph.D. (1972). Dr. Fraser was appointed to the faculty of the University of Illinois in 1973 (Assistant, Associate and Full Professor), before moving in 1989 to the Ohio State University as Ohio Regents Eminent Scholar and Professor. He was appointed as a Senior Research Scientist at the United Technologies Research Center from 1979-1980. He has also been a Senior von Humboldt Researcher at the University of Göttingen, a Senior Visitor at the University of Cambridge, a visiting professor at the University of Liverpool, and he spent a sabbatical leave at the Max-Planck Institut für Werkstoffwissenscahften in Stuttgart. He has been an Honorary Professor of Materials and Technology at the University of Birmingham since 1988. In 2014, he was recognized as an Honorary Professor at the Nelson Mandela Metropolitan University in Port Elizabeth, South Africa. He is also an adjunct professor at Monash University in Australia and at the University of North Texas. At present, he serves as Director of the Center for the Accelerated Maturation of Materials (CAMM) at Ohio State. He has been a member of the National Materials Advisory Board and the US Air Force Scientific Advisory Board. He has consulted for a number of national laboratories and several industrial companies. He is a Fellow of TMS, ASM, IOM3 (UK), MSA, and MAS. He has published over 430 papers in scholarly journals and given over 370 invited presentations. He has graduated over 52 doctoral students and 36 students graduating with the degree of M.S.
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Jiri is a PhD student and visiting scholar from Charles University, Prague, Czechia. He graduated in 2016 focusing on the microstructure evolution in the milled and sintered titanium, showing the microstructure of the severely deformed powder particle using transmission Kikuchi diffraction (TKD) (Figure 1).
At his home university, he is primarily interested in the field assisted sintering technique (FAST) and its use for the development of novel metastable beta alloys of the Ti-Nb-Zr-(Ta)-O system for implant production. This work is in collaboration with industry partner Beznoska.
At Ohio State, Jiri is currently part of the research project aiming to develop a deeper understanding of the various phase transformations in metastable Ti alloys (Figures 2-4).
Graduate Research Associates
Mathew graduated from the University of Florida with a bachelors degree in Materials Science and a certificate in metallurgy. During that time he worked on a project to develop an aluminum based intermetallic for additive manufacture, and on a separate project to improve the manufacturing process of niobium based superconductors. In addition to engineering, Mathew also did a minor in Japanese language and culture.
Benjamin Georgin is a graduate research assistant in the Center for the Accelerated Maturation of Materials at The Ohio State University. He obtained his Bachelors in Materials Science and Engineering from OSU in 2016. Ben researches powder metallurgy net-shape manufacturing of nickel-base superalloys for aerospace applications. He specifically focuses on improving high temperature creep rupture and fatigue performance in hot isostatically pressed (HIP) turbine blades and disks.
In his research, Ben uses advanced characterization equipment and techniques to study the formation of prior particle boundaries (ppbs) in HIP components. The characterization techniques include low energy scanning electron microscopy, focused ion beam, and transmission electron microscopy to investigate powder stock, bulk microstructural development, and defect formation. Ben is also interested in HIP for functionally graded bimetallic materials and has experience in characterizing microstructural development in additive manufactured and linear friction welded titanium.
Zachary attended The Ohio State University as an undergraduate where he earned a bachelor’s degree in Materials Science and Engineering as well as a minor in Nuclear Engineering in 2015. He is currently working on his PhD in Materials Science and Engineering. Zachary collaborates with the University of Birmingham on his research involving a new alpha/beta titanium alloy (Ti-407) developed by TIMET. The alloy exhibits enhanced properties compared to other alpha/beta alloys, such as Ti-6Al-4V and Ti-3Al-2.5V. Ti-407 achieves these properties through a balance of strength and ductility. It is critically important to understand the deformation mechanisms in order to elucidate the source of enhanced properties seen in this alloy.
Current investigations focus on determining the alloy’s response to strain as well as microstructure. Quantification of the microstructural features is done through the combination of backscattered electron imaging (BSE) and the image processing software MIPAR. Strain is tracked using optical digital image correlation (DIC) during room temperature mechanical tests. After samples have been mechanically tested, Zachary uses a combination of transmission Kikuchi diffraction (TKD) and transmission electron microscopy (TEM) to analyze the deformation substructure of the alloy. Relating deformation mechanisms back to microstructure will help optimize the properties achieved in this alloy. Through use of advanced SEM based techniques such as in-situ straining+EBSD, a new deformation mechanism has been uncovered in this alloy, which manifests itself as sliding at the alpha/beta interfaces .
Zachary has also collaborated with the University of Birmingham in studies involving the influence of heat treatment on the microstructure and properties of HIPed Ti-6Al-4V, with emphasis on oxygen partitioning upon cooling, through the use of electron energy loss spectroscopy (EELS) . This work also includes alloy development through use of a refined alpha phase in titanium alloys .
Zachary is also working on understanding the role of nano-scaled structural non-uniformities on deformation substructures in beta titanium alloys. This work is work is being collaborated with the University of Nevada, Reno and Max-Planck-Institut für Eisenforschung. Advanced transmission electron microscopy techniques are being employed to understand the hierarchical deformation substructure formed during deformation [4,5].
1. Interface and colony boundary sliding as a deformation mechanism in a novel titanium alloy. https://doi.org/10.1016/j.scriptamat.2019.11.063
2. The influence of heat treatment on the microstructure and properties of HIPped Ti-6Al-4V. https://doi.org/10.1016/j.actamat.2018.12.025
3. Fine alpha in current and newly developed Ti alloys. https://doi.org/10.1016/j.actamat.2019.05.022
4. The role of nano-scaled structural non-uniformities on deformation twinning and stress-induced transformation in a cold rolled multifunctional β-titanium alloy. https://doi.org/10.1016/j.scriptamat.2019.10.029
5. Novel deformation twinning system in a cold rolled high-strength metastable- 𝛽Ti-5Al-5V-5Mo-3Cr-0.5Fe alloy. https://doi.org/10.1016/j.mtla.2020.100614
Calvin Mikler is a Graduate Research Associate in the Center for the Accelerated Maturation of Materials at The Ohio State University. He obtained his MS in Materials Science and Engineering from the University of North Texas in 2017 where he focused on LENS™ additive manufacturing of Fe-Ni based magnetic materials, biomedical titanium alloys, and complex concentrated alloys.
Calvin is currently a PhD student and collaborates with the Air Force Research Laboratory (WPAFB in Dayton, OH) on his research involving powder metallurgy processing and development of niobum-based refractory alloys. These alloys are commonly used in high temperature applications such as leading edges of hypersonics, rocket nozzles, and heat pipes. Processing methods of interest include direct powder consolidation via hot isostatic pressing, binder jet additive manufacturing, and LENS™ additive manufacturing. Current efforts focus on two alloy systems: the commonly used C-103 (Nb-10Hf-1Ti wt%), which was featured on the 1960’s Apollo missions, and the WC-3009 (Nb-30Hf-9W wt%) alloy systems.
Calvin was the recipient of the NSF EAPSI fellowship to Singapore in 2016 where he spent two months at Nanyang Technological University conducting research on additive manufacturing of magnetic alloys. Calvin is also a 2017 DoD SMART Scholar and has signed on for a position at AFRL after graduation.
Katy graduated from The Ohio State University with a Bachelor's degree in Materials Science and Engineering in 2020. During her undergrad, she worked as a research assistant in CAMM which sparked her interest in Ti and Ni alloys and their aerospace applications. She also spent a summer working for Worthington Steel as a quality lab technician. During her senior year at OSU, Katy worked on a team researching protective coatings as a solution to corrosion issues on Navy aircrafts. She is currently working towards a Master's degree in Materials Science and Engineering.
Nevin is a Graduate Research Associate at CAMM and is working towards his PhD. He received his Bachelor's Degree in Materials Engineering from the University of British Columbia graduating top of his class. His current research focuses on developing new titanium alloys for additive manufacturing to take advantage of the significantly different processing path in AM compared to conventional manufacturing methods. Ti-64 – The predominant titanium alloy used in additive today – has an inherent columnar microstructure due to the high thermal gradient which develop during an additive build. This columnar microstructure leads to anisotropy in mechanical properties, which can be detrimental in certain designs and applications. With the addition of beta-eutectoid stabilizers to alloys such as Ti-64, one can achieve a columnar to equiaxed transition eliminating this issue. The mechanical properties of these modified alloys is comparable and in many cases better than Ti-64, which may lead to widespread applications as the new workhorse alloy for additive titanium. Nevin’s research involves alloy design based on first principles, high resolution characterization, as well as mechanical and fatigue testing. Before arriving at OSU, Nevin worked for TIMET - a leader in titanium development and manufacturing – which sparked his interest in working with titanium alloys.