Alloy Design-for-Reuse: Continuous Damage Resistance via Structural Resetting

Seminar | March 15 | 4-5 p.m. | 348 Hearst Memorial Mining Building

 Professor C. Cem Tasan, Massachusetts Institute of Technology

 Materials Science and Engineering (MSE)

Metals are poor at self-repair due to the ambient temperature sluggishness of transformations compared to, e.g., polymers. On the other hand, they respond well to non-autonomous repair
treatments aimed at macroscopic discontinuities (see, for example, repair of bridge steel cracks, worn turbine blades, forging of casting defects, etc.). This forgiving nature of metals, however, has not been systematically utilized to focus on early stages of microscopic damage nucleation, where preventive healing becomes a feasible option. The challenge thereof arises due to the complexity of plasticity and damage micro-mechanics, and phase transformation
kinetics in multi-phase microstructures. In Tasan Group at MIT, by developing multi-field mapping tools and methods, we improve our understanding of these microstructural processes,
and by utilizing this understanding, we develop new damage resistance and alloy design concepts. In this talk, the focus will be on three topics: (i) novel in-situ methods for damage
characterization; (ii) new damage-resistant alloy design concepts; and (iii) resettable alloys, where each microstructural constituent has the capability to revert back to its exact predeformation state via feasible resetting treatments.

 daisyh@berkeley.edu, 510-642-3801