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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Silver Hardening via Hypersonic Impacts

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Oliveira, Eliezer Fernando [1, 2] ; da Silva Autreto, Pedro Alves [1, 3] ; Galvao, Douglas Soares [1, 2]
Total Authors: 3
[1] Univ Estadual Campinas, Gleb Wataghin Inst Phys, Campinas, SP - Brazil
[2] Univ Campinas UNICAMP, Ctr Computat Engn & Sci CCES, Campinas, SP - Brazil
[3] Fed Univ ABC, Ctr Nat Human Sci, Santo Andre, SP - Brazil
Total Affiliations: 3
Document type: Journal article
Source: MRS ADVANCES; v. 3, n. 8-9, p. 489-494, 2018.
Web of Science Citations: 0

The search for new ultra strong materials has been a very active research area. With relation to metals, a successful way to improve their strength is by the creation of a gradient of nanograins (GNG) inside the material. Recently, R. Thevamaran et al. {[}Science v354, 312-316 (2016)] propose a single step method based on high velocity impact of silver nanocubes to produce high-quality GNG. This method consists of producing high impact collisions of silver cubes at hypersonic velocity (similar to 400 m/s) against a rigid wall. Although they observed an improvement in the mechanical properties of the silver after the impact, the GNG creation and the strengthening mechanism at nanoscale remain unclear. In order to gain further insights about these mechanisms, we carried out fully atomistic molecular dynamics simulations (MD) to investigate the atomic conformations/rearrangements during and after high impact collisions of silver nanocubes at ultrasonic velocity. Our results indicate the coexistence of polycrystalline arrangements after the impact formed by core HCP domains surrounded by FCC ones, which could also contribute to explain the structural hardening. (AU)

FAPESP's process: 13/08293-7 - CCES - Center for Computational Engineering and Sciences
Grantee:Munir Salomao Skaf
Support type: Research Grants - Research, Innovation and Dissemination Centers - RIDC
FAPESP's process: 16/18499-0 - Investigation on the structural, mechanical and functional properties of carbon-based nanostructures
Grantee:Eliezer Fernando de Oliveira
Support type: Scholarships in Brazil - Post-Doctorate