Journal Article

PUBDB-2025-03917

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Effects of reinforcement distribution on stress heterogeneity in magnesium matrix composites: In-situ synchrotron experiments and crystal plasticity modeling

Zhou, B. (Corresponding author) ; Zhou, H. ; Wang, J. ; Zhu, G. (Corresponding author)Extern*

2025
Elsevier Lausanne

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Please use a persistent id in citations: doi:10.1016/j.jallcom.2025.182902

Abstract: Premature failures of magnesium matrix composites (MMCs) reinforced with ceramic particles generally originate from stress concentrations in particle-agglomerated regions. This study investigates how the spatial distribution of SiC particles (SiCp) affects internal stress states in a SiCp/Mg-5Al composite through in-situ synchrotron tensile testing combined with multi-scale crystal plasticity modeling. Simulation of four microstructures with coarse intergranular SiCp (5 μm), refined intergranular SiCp (2 μm), intergranular-dominated SiCp, or balanced hybrid SiCp have performed. Key findings show that refining intergranular SiCp (from 5 μm to 2 μm) increases particle stress heterogeneity by 65 %. Conversely, intragranular dispersion reduces stress localization. Meanwhile, the balanced hybrid distribution minimizes von Mises stress variability in SiCp. The critical resolved shear stress (CRSS) ratio of non-basal to basal slip in the composite is determined to be 3.3–4.3. Plastic deformation of the composite is primarily governed by non-basal dislocation slip due to its fiber texture. We emphasize the importance of combining matrix grain refinement and alloying to optimize reinforcement dispersion and strain compatibility within MMCs. The related strategies may synergistically improve both ductility and strength of MMCs.

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Contributing Institute(s):

1. DOOR-User (DOOR ; HAS-User)
2. Helmholtz-Zentrum Hereon (Hereon)

Research Program(s):

1. 6G3 - PETRA III (DESY) (POF4-6G3) (POF4-6G3)

Experiment(s):

1. PETRA Beamline P21.2 (PETRA III)

Appears in the scientific report 2025

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Database coverage:
; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; Essential Science Indicators ; IF >= 5 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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