13th International Conference on the Technology of Plasticity (ICTP 2021): Wednesday Keynote
Program Organizers: Glenn Daehn, Ohio State University; Libby Culley, The Ohio State University; Anupam Vivek, Ohio State University; Jian Cao, Northwestern University; Brad Kinsey, University of New Hampshire; Erman Tekkaya, TU Dortmund; Yoshinori Yoshida, Gifu University

Wednesday 7:30 AM
July 28, 2021
Room: Virtual: Keynote
Location: Virtual

Session Chair: Anupam Vivek, The Ohio State University; Gerhard Hirt, RWTH Aachen University


7:30 AM  Keynote
Using Plasticity for Making High-performance Nanostructured Composites: Irene Beyerlein1; 1University of California, Santa Barbara
    Superior structural properties of materials are generally desired in harsh environments, such as elevated temperatures, the high strain rates of impact, and irradiation. Composite nanolaminates, built with alternating stacks of metal layers, each with nanoscale individual thickness, are proving to exhibit many of these target properties. In principle, the nanolaminate concept can be applied to any bimetallic system; however, they have not been widely applied to materials with a hexagonal close-packed (hcp) crystal structure. The roadblock lies in their complex, anisotropic deformation behavior. In this presentation, we discuss recently developed methods to manufacture nanostructured composites containing hcp metals. These techniques exploit plastic deformation as part of the synthesis process and have the potential to manufacture product in forms and sizes suitable for high-performance structural applications. We further highlight in this presentation modeling and experimental efforts to understand linkages between the processed nanostructure, local deformation mechanisms, and mechanical performance.

8:15 AM  Keynote
The Fundamentals of Microparticle Impact Bonding in Metals, Alloys, and Advanced Materials: Christopher Schuh1; 1Massachusetts Institute of Technology
    There are a variety of materials manufacturing technologies that rely on kinetic impacts to achieve additive material build-up, including, notably, cold spray and laser-induced forward transfer. The unit processes of these manufacturing paradigms involve small quantities of material (micrometer scale particles) and extremely high velocities (~ km/s), so the impact events involve a number of fundamental physical mysteries at the extremes of materials mechanics. This talk will overview our efforts at developing quantitative in-situ methods to study such impacts, involving strain rates up to about 108 s-1. Using an all-optical test platform to launch and observe the impacts, we are able to provide insight on the mechanics of shock and spall, bond formation, and erosive wear. By systematically exploring a range of materials with different properties, we develop a picture of the controlling physics of bonding, which includes mechanical properties (elastic and plastic), thermal properties (related to adiabatic heat), and surface films. The talk will review our work on a variety of pure metals and engineering alloys and will also provide a view on new issues that arise in advanced materials like metallic glasses.