||“Noise” is everywhere in our daily life, such as the crackling noise arising from paper crumpling and fault movement during earthquakes. In materials science, the phenomenon of noise is also ubiquitous, particularly, in the study of the deformation behavior of materials, which usually manifests as serrated plastic flows. Over the past few years, this interesting and universal phenomenon has attracted tremendous research interest, which can be observed among a wide range of advanced materials, from ordered intermetallics, superalloys, granular matters, single-crystalline metals, AlMg alloys, low carbon and transformation-induced plasticity (TWIP)/ twinning-induced plasticity (TRIP) steels, shape-memory alloys, nano materials, high-entropy alloys to metallic glasses. To provide a physical understanding of the universal noise behavior, different elastic coupling models have been proposed, with a variety of scaling relations being predicted. However, the source of noise when these advanced materials are deformed is still being debated. To materials scientists, understanding the structural origin of the noise may help avoid catastrophic failure and, therefore, inform the design of plasticity in these advanced materials.
The proposed symposium will gather a diverse group of prominent experimentalists, computational scientists, and theoreticians working in related themes at the interface among Materials Science and Engineering, Physics, Mechanics, Earth Science, Biology, and Bio-engineering. The program focuses in particular on phenomena, which involve intermittent material responses, sometimes leading to the emergence of large fluctuations: Serrations in stress-strain curves, fracture and plasticity in crystalline or non-crystalline materials, granular materials, phase transition, martensitic transformations, structural relaxation near the glass-transition, the jamming transition, fracture-surface characterization, bio-cells, bio-engineering, or Barkhausen noise in magnetic materials. The fundamental understanding of these phenomena is facing considerable difficulties as the situations of interest are out-of-equilibrium and, hence, out of reach for conventional tools of materials science, statistical physics, mechanics, and thermodynamics. Moreover, these diverse phenomena involve physical processes occurring across many orders of magnitudes in space and time, which makes their theoretical treatment even more challenging.
The emergence of large fluctuations, however, can be broadly assigned to the competition between the small-scale disorder (structural disorder, defects, and heterogeneities) and long-range (elastic) interactions. This deep similarity substantiates the importance of a multidisciplinary dialog between the communities of scientists and engineers working on these diverse topics. Reviewing recent experimental progresses and stimulating the exchange of ideas, methods, approaches, and models across the boundaries of these topics are essential steps in the search for new theoretical paradigms that can help us account for many unexplained phenomena in these fields.
Explored topics include
(1) Deformation behavior of crystalline metals and alloys, amorphous materials, nanocrystalline materials, composites, and granular materials
(2) Shear-band formation, twining, detwinning, fatigue, plasticity, fracture morphology, earthquake, bio-cell, bio-engineering, fracture, etc. mechanisms
(3) Theoretical modeling and simulation
(4) Nondestructive materials testing and other applications