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Condensed Matter > Materials Science
Title: Enhanced mobility of dislocation network nodes and its effect on dislocation multiplication and strain hardening
(Submitted on 25 Oct 2022 (v1), last revised 2 Apr 2024 (this version, v3))
Abstract: Understanding plastic deformation of crystals in terms of the fundamental physics of dislocations has remained a grand challenge in materials science for decades. To overcome this, the Discrete Dislocation Dynamics (DDD) method has been developed, but its lack of atomistic resolution leaves open the possibility that certain key mechanisms may be overlooked. By comparing large-scale Molecular Dynamics (MD) with DDD simulations performed under identical conditions we uncover significant discrepancies in the predicted strength and microstructure evolution in BCC crytals under high-strain rate conditions. These are traced to unexpected behaviors of dislocation network nodes forming at dislocation intersections, that can move in ways not previously anticipated as revealed by MD. Once these newfound freedoms of nodal motion are incorporated, DDD simulations begin to closely match plastic evolution observed in MD. This additional mechanism of motion whereby non-screw dislocations can change their glide plane profoundly affects fundamental processes of dislocation multiplication, recovery and storage that define strength of metals.
Submission history
From: Nicolas Bertin [view email][v1] Tue, 25 Oct 2022 21:13:50 GMT (3105kb,D)
[v2] Sat, 12 Nov 2022 19:13:56 GMT (3161kb,D)
[v3] Tue, 2 Apr 2024 17:43:22 GMT (2454kb,D)
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