Role of Microstructure and Texture on Compressive Strength Improvement of Mg/(Y2O 3 + Cu) Hybrid Nanocomposites

In this study, uniaxial compressive properties of pure magnesium and Mg/(Y 2O3 + Cu) hybrid nanocomposites are investigated. Addition of hybrid reinforcements (ceramic + metal) at nano-length scale led to grain-size refinement and the amount of porosity remained below 1%. The presence of hybrid rein...

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Bibliographic Details
Published in:Journal of composite materials 2010-12, Vol.44 (25), p.3033-3050
Main Authors: Tun, K.S., Gupta, M.
Format: Article
Language:English
Subjects:
Compressive strength
Copper
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Fracture mechanics (crack, fatigue, damage...)
Fundamental areas of phenomenology (including applications)
Inelasticity (thermoplasticity, viscoplasticity...)
Magnesium
Materials science
Materials synthesis
materials processing
Nanocomposites
Nanomaterials
Nanostructure
Physics
Reinforcement
Solid mechanics
Structural and continuum mechanics
Surface layer
Texture
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Summary:In this study, uniaxial compressive properties of pure magnesium and Mg/(Y 2O3 + Cu) hybrid nanocomposites are investigated. Addition of hybrid reinforcements (ceramic + metal) at nano-length scale led to grain-size refinement and the amount of porosity remained below 1%. The presence of hybrid reinforcements led to a significant increase in 0.2% compressive yield strength (CYS) and ultimate compressive strength (UCS) while the failure strain was compromised. Best improvements in 0.2% CYS, UCS, and hardness were realized when the amount of copper was increased to one volume percent for fixed 0.7% Y2O3 nanoparticulates. Comparatively low ductility of magnesium hybrid nanocomposites under compressive loading was attributed to the absence of twinning unlike pure magnesium. The variation in the mechanical properties in this study is correlated with the microstructural features and texture effects.
ISSN:0021-9983
1530-793X
DOI:10.1177/0021998310369591