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Simulating dislocation-solute interactions in dilute alloys to understand serrated flow

Simulations of solute-dislocation interactions using elasto-kinetic stochastic models reveal the conditions under which serrated flow occurs. Serrated flow is a deformation instability of some alloys by which they can lose ductility, and thus it is important to understand the mechanisms behind it.

Published in Electrical & Electronic Engineering

Go to the profile of Jaime Marian
Jaime Marian
Professor, University of California Los Angeles
Simulating dislocation-solute interactions in dilute alloys to understand serrated flow
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Nature
Nature Nature

Simulating the mechanisms of serrated flow in interstitial alloys with atomic resolution over diffusive timescales - Nature Communications

Understanding the plastic deformation mechanism within specific ranges of temperature and strain in metal alloys is of great technological importance. Here the authors report on dynamic simulations of dislocation–solute coevolution in tungsten crystals containing a few atomic parts per million of interstitial oxygen and their relation to unstable plastic flow.

When a metal alloy is deformed, line defects called dislocations move, producing plastic slip as they do. In dilute alloys above a certain temperature, solutes may move as well, in some cases over time scales comparable to those of dislocation motion. From a physical point of view, studying this interplay is challenging because solute atoms need to be studied at atomistic length scales, but their diffusion often takes place over time scales much beyond those of atomic vibrations. We have developed elasto-kinetic stochastic models of dislocation-solute coevolution that allow us to bridge this scale gap and study the onset of serrated flow in structural alloys. This allow us to look at these processes on the length and time scales over which they truly occur, which will be helpful to understand how to design better materials that can avoid the detrimental effect of serrated plastic flow.

https://www.nature.com/article...

Go to the profile of Jaime Marian
Jaime Marian
Professor, University of California Los Angeles

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