SEMINAR - "Structure-based design and mechanical properties of amorphous alloys -- integrating simulation, modeling, and experiment", by Yongqiang Cheng, Ph.D., Oak Ridge National Laboratory, R&D Associate (Clifford G. Shull Fellow)

Education - Colloquium - WPI Only

Monday, March 11, 2013
11:00 AM-12:00 PM

Higgins Laboratories
HL 102

The rapid development of amorphous alloys in the past few decades has opened up great opportunities for alloy design. Having no long-range periodicity, the amorphous alloys deform in a drastically different fashion than the traditional metals, leading to their distinct mechanical properties. These novel materials, when made in monolithic form or as glass-crystal composites, can greatly extend and diversify the portfolio of advanced alloys, offering new dimensions for research and development. Despite the immense potential, however, amorphous alloys are still poorly understood in many aspects, including their structure and mechanical behavior. In this presentation, I will demonstrate how simulation and modeling can help us to understand and design amorphous alloys using three examples -- structure-based composition design, prediction of the ideal strength, and stability of plastic deformation. Molecular dynamics simulation (both quantum and classical) and atomistically-informed multiscale modeling will be employed to study the fundamental principles and critical processes behind the seemingly random structure, and the controlling mechanisms will be revealed through quantitative comparison with experimental observations. The results may provide useful guidance for the design of mechanical systems based on amorphous alloys, and pave the way towards understanding the metallic glass-crystal composites with various nano/microstructures.

Suggested Audiences: College

Phone: 508-831-5236

Last Modified: March 6, 2013 at 9:15 AM

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