Imperial College London

DrNaNi

Faculty of EngineeringDepartment of Materials

Honorary Lecturer
 
 
 
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Contact

 

n.ni

 
 
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Location

 

LM04Royal School of MinesSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Ferraro:2017:10.1016/j.actamat.2017.10.059,
author = {Ferraro, C and Meille, S and Réthoré, J and Ni, N and Chevalier, J and Saiz, E},
doi = {10.1016/j.actamat.2017.10.059},
journal = {Acta Materialia},
pages = {202--215},
title = {Strong and tough metal/ceramic micro-laminates},
url = {http://dx.doi.org/10.1016/j.actamat.2017.10.059},
volume = {144},
year = {2017}
}

RIS format (EndNote, RefMan)

TY  - JOUR
AB - There is a growing interest in the development of composites with complex structures designed to generate enhanced mechanical properties. The challenge is how to implement these structures in practical materials with the required degree of control. Here we show how freeze casting of ceramic preforms combined with metal infiltration can be used to fabricate Al2O3/Al-4wt% Mg micro-laminated composites. By manipulating the solid content of the suspension and the morphology of the ceramic particles (from platelets to round particles) it is possible to access a range of structures with layer thickness varying between 1 and 30 μm and metallic contents between 66 and 86 vol%. The mechanical response of the materials is characterized by combining bending tests with observation of crack propagation in two and three dimensions using different imaging techniques. These composites are able to combine high strength and toughness. They exhibit a rising R-curve behaviour although different structures generate different toughening mechanisms. Composites fabricated with Al2O3 particles exhibit the highest fracture resistance approaching 60 MPa m1/2, while laminates prepared from Al2O3 platelets exhibit higher strengths (above 700 MPa) while retaining fracture resistance up to ∼40 MPa m1/2. The results provide new insights on the effect of structure on the mechanical properties in metal-ceramic composites as well as on the design of appropriate testing procedures.
AU - Ferraro,C
AU - Meille,S
AU - Réthoré,J
AU - Ni,N
AU - Chevalier,J
AU - Saiz,E
DO - 10.1016/j.actamat.2017.10.059
EP - 215
PY - 2017///
SN - 1359-6454
SP - 202
TI - Strong and tough metal/ceramic micro-laminates
T2 - Acta Materialia
UR - http://dx.doi.org/10.1016/j.actamat.2017.10.059
UR - http://hdl.handle.net/10044/1/54588
VL - 144
ER -