Effect of grain size on the microscopic deformation microstructure of γ-Fe during nanoindentation by molecular dynamics simulation

Geng, J, He, Q, Qi, X, Ren, X ORCID: 0000-0001-6132-1228 and Yang, Q (2026) Effect of grain size on the microscopic deformation microstructure of γ-Fe during nanoindentation by molecular dynamics simulation. Materials Letters, 422. ISSN 0167-577X

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Abstract

The nanoindentation models of γ-Fe crystal with three grain sizes were established by molecular dynamics to analyze the effect of nanocrystalline grain size on the microscopic deformation microstructure of γ-Fe crystals in this paper. The calculation results show that the when the grain size is 200 nm, the number of stacking faults increases initially and then decreases, while when the grain sizes are 40 nm or 20 nm, that of stacking faults first increases and then remains basically unchanged. When the grain size is 200 nm, the maximum dislocation density is 1.29 nm−2. When the grain size is 40 nm and 20 nm, those are 2.03 nm−2 and 2.30 nm−2, respectively.

Item Type:	Article
Uncontrolled Keywords:	40 Engineering; 3403 Macromolecular and Materials Chemistry; 4016 Materials Engineering; 34 Chemical Sciences; 02 Physical Sciences; 03 Chemical Sciences; 09 Engineering; Materials; 34 Chemical sciences; 40 Engineering; 51 Physical sciences
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) T Technology > TN Mining engineering. Metallurgy
Divisions:	Engineering
Publisher:	Elsevier
Date of acceptance:	19 July 2026
Date of first compliant Open Access:	6 August 2026
Date Deposited:	05 Aug 2026 10:06
Last Modified:	06 Aug 2026 00:50
DOI or ID number:	10.1016/j.matlet.2026.141315
URI:	https://researchonline.ljmu.ac.uk/id/eprint/29103

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