Dynamic compressive response and impact resistance of bioinspired nacre-like 2024Al/B4C composites

In this study, the researchers constructed nacre-inspired 2024Al/B4C composites with a lamellar-interpenetrated structure using pressured infiltration of alloy melt into freeze-cast B4C scaffolds, and investigated their dynamic and ballistic properties. The defects such as pores or cracks were hardl...

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Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2022-01, Vol.831, p.142261, Article 142261
Main Authors: Wang, Yang, Liu, Qiang, Zhang, Biao, Zhang, Haoqian, Jin, Yicheng, Zhong, Zhaoxin, Ye, Jian, Ren, Yuhan, Ye, Feng, Wang, Wen
Format: Article
Language:English
Subjects:
Aluminum base alloys
Aluminum boron carbide
Ballistic impact tests
Bio-inspired structures
Composite materials
Compressive properties
Compressive strength
Ductile fracture
Dynamic response
Energy absorption
Energy-dissipating mechanisms
Freeze casting
Hardening rate
Impact resistance
Intermetallic compounds
Lamellar structure
Metal/ceramic composites
Nacre
Strain rate
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Summary:In this study, the researchers constructed nacre-inspired 2024Al/B4C composites with a lamellar-interpenetrated structure using pressured infiltration of alloy melt into freeze-cast B4C scaffolds, and investigated their dynamic and ballistic properties. The defects such as pores or cracks were hardly observed, and a few intermetallic compounds (IMCs) were contained within the alloy matrix. Because of strain-rate hardening and alloy matrix melting, the dynamic compressive strength and strain were greater than quasi-static ones. The dynamic response could be interpreted by a mixture rule according to B4C volume fraction, and by main fracture phenomena such as cracking of B4C and IMCs, alloy matrix deformation, and interfacial debonding. After the ballistic test, the nacre-like composites achieved enhanced impact resistance compared to conventional Al/B4C materials, while maintaining integrity rather than breaking destructively as monolithic Al/B4C composites did, which derived from multiple energy absorption mechanisms including crack deflection, ductile-ligament bridging, and pull-out behavior. This work opens a promising new avenue for the development of advanced armor systems.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2021.142261