Abstract

Radiation response of a material is a consequence of defects' evolution in any radiation damage event. The radiation-induced defects can significantly alter the mechanical properties of a material. Radiation damage initiates from incident neutron by bombardment on solid material causing production and evolution of Frenkel defects. Since voids are formed due to aggregation of a large number of vacancies that cause dimensional changes and hence irradiation-induced swelling. In order to characterize the effect of irradiation defects, we have performed molecular dynamics (MD) simulations to investigate nanoindentation response of point defects and voids in Fe and their effects on mechanical parameters. The radial effect of voids and their interaction mechanism is also explored by nanoindentation simulation. It has been found that most of the dislocation produced are and during nanoindentation in all simulated models. There will be an increase in dislocation density which will harden the material and reduce its toughness. The mechanical parameters such as hardness H and reduced elastic modulus Er of irradiation defects are calculated from P-h curves. It is found that both H & Er of the point defects and voids are lower than the perfect model.

Department(s)

Civil, Architectural and Environmental Engineering

Second Department

Mechanical and Aerospace Engineering

Comments

National Natural Science Foundation of China, Grant 11505037

Keywords and Phrases

Elastic modulus; Hardness; Irradiation defects; Molecular dynamics simulations; Nanoindentation

International Standard Serial Number (ISSN)

0126-6039

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2024 Penerbit UKM, All rights reserved.

Publication Date

01 Jan 2019

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