Issue 12, 2024, Issue in Progress

Shock-induced plastic deformation of nanopowder Ti during consolidation and spallation

Abstract

Consolidating nanopowder metals via impact loading is a potentially significant method for synthesizing and processing bulk nanocrystalline materials. However, until now, the microstructural features, plastic deformation during consolidation, and corresponding mechanisms have been seldom revealed. Using molecular dynamics (MD) simulations, we have studied the plastic deformation, densification, spallation, and micro-jetting in nanopowder titanium (np-Ti) during shock. Upon impact, np-Ti undergoes a transition from heterogeneous plasticity, including basal stacking faults (SFs) and {10[1 with combining macron]2} twinning, to homogeneous disordering, as the impact velocity increases. Then the nanopowder structure evolves into a bulk nanostructure after the final densification, contributed by pore collapse. The subsequent detwinning arises during the release and tension stage, conducing to a partial structural recovery. When the impact velocity up ≥ 1.0 km s−1, the spallation is following, prompted via GB-sliding and disordering. Upon shock impact, it also facilitates micro-jetting owing to the presence of nanopores, contributing to the pressure gradient and transverse velocity gradient.

Graphical abstract: Shock-induced plastic deformation of nanopowder Ti during consolidation and spallation

Article information

Article type
Paper
Submitted
09 Jan 2024
Accepted
28 Feb 2024
First published
13 Mar 2024
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2024,14, 8455-8463

Shock-induced plastic deformation of nanopowder Ti during consolidation and spallation

D. He, M. Wang, W. Bi and L. Wang, RSC Adv., 2024, 14, 8455 DOI: 10.1039/D4RA00227J

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