HIGHLIGHTS ADVANCED MATERIALS & PROCESSES | MAY/JUNE 2023 63 2023 Edward DeMille Campbell Memorial Lecture Tuesday, October 17 | 10:30 – 11:30 a.m. Dr. George T. (Rusty) Gray, III, FASM Laboratory Fellow and Scientist 6, Los Alamos National Laboratory, Materials Physics and Applications Division, N.M. “Dynamic Behavior of Additively Manufactured Materials” Additive manufacturing (AM) has provided a new paradigm of control not only of material microstructure but also of structural assembly. The promise of AM lies in tailoring properties through this exquisite microstructural and topological design and fabrication, and the possibility of “metamaterial” properties simply not possible through most conventional manufacturing. Relevant to mechanical properties and dynamic perform- ance, the application of AM has resulted in many examples in which control of deformation mechanics and structural instabilities has led to novel properties, such as high strength-to-weight ratios, tailored thermal management, and auxetic properties. This talk will provide an overview of the dynamic behaviors of additively manufactured metals and polymers and provide a perspective on the current challenges in AM for dynamic loading environments and future directions in the area. 2023 IMS Henry Clifton Sorby Lecture Tuesday, October 17 | 1:00 – 2:00 p.m. Prof. Yuichi Ikuhara, Director, Institute of Engineering Innovation, School of Engineering, The University of Tokyo “Grain Boundary Atomic Structures, Segregation, Dynamics in Ceramics” Ceramics have been widely used for structural applications due to their superior mechanical properties. The behavior of grain boundary (GB) properties is strongly dependent on the GB characters. However, this effect is strongly influenced by the dopant segregation at GBs. To clarify the GB atomic structures in ceramics such as Al2O3, ZrO2, SrTiO3, their bicrystals including various types of GBs with and without dopants were systematically fabricated. Then, the atomic structures and chemistry were characterized by aberration corrected STEM, atom-resolved EDS and EELS, and the relationship between GB characters, segregated dopants, and the properties for such ceramics will be discussed. GB dynamics such as fracture and migration also play an important role in considering the sintering behavior and the properties. However, it is still unclear as to how the GB fractures and STUDENT BOARD MEMBERS migration proceeds at atomic scale. GB fracture and deformation are dynamically observed by TEM in situ straining experiments using nanoindentation and newly developed MEMS straining holders. It was found that GB fracture occurs along the special crystal plane and dislocations are emitted from the crack front. Recently, we have proposed that GB migration behavior in ceramics can be precisely controlled by the aid of high-energy electron beam irradiation. This electron beam technique was applied to visualize the atomistic GB migration, which was revealed to be processed by a cooperative shuffling of atoms in GB ledges along specific routes. As a result, the GB passed through several different GB structures with low formation energies during GB migration. ASM Student Board Members for 2023-2024 Announced The ASM Board of Trustees values the insights, ideas, and participation of Material Advantage students. The Student Board Member program provides the opportunity to attend four board meetings where the students will meet and work with leading technical professionals and gain leadership skills that will benefit them throughout their career. The next deadline for submissions is April 1, 2024. Details can be found on the ASM website. Kingsley Amatanweze Missouri University of Science and Technology Kingsley Tochukwu Amatanweze hails from Mgbowo, a community in Enugu Sate, southeast Nigeria. He has a bachelor’s degree in metallurgical and materials engineering from the University of Nigeria, Nsukka and is currently pursuing a Ph.D. in materials science and engineering at Missouri University of Science and Technology, Rolla, where he works as a graduate research assistant in the Peaslee Steel Manufacturing Research Center. Amatanweze is a corporate member of the Nigerian Metallurgical Society and was president of the National Association of Metallurgical and Material Engineering Students, University of Nigeria, Nsukka Chapter. He currently serves as president of the International Students Club at his university. Gray Ikuhara Amatanweze
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