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Laser induced hierarchical nano-composites in metallic multi-films: structural characterization

Published online by Cambridge University Press:  01 February 2011

C. Daniel  and
F. Mücklich
C. Daniel*
Affiliation:
Functional Materials, Department for Materials Science, Saarland University, Saarbruecken, GERMANY
F. Mücklich
Affiliation:
Functional Materials, Department for Materials Science, Saarland University, Saarbruecken, GERMANY
*
1 Phone: +49 681 302 3048, Fax: +49 681 302 4876, Email: [email protected]
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Abstract

Biological solutions to enhance strength and stability often use lateral and hierarchical composite structures from nano- to micro-scale. The effect does not consist of a large chemical variety but it is realized by structural composites (namely phase changes and orientations). A new developed bio-mimetic laser interference metallurgical technique uses this biological approach to optimize mechanical properties of surfaces and thin films. A hierarchical nano-composite is realized by both a vertical nm-scaled period of PVD-processed multi-films and a lateral μm-scaled period of laser interference metallurgy.

In past, laser interference irradiated Ni/Al multi-films showed periodical properties in the range of interference period. The hardness and modulus could be varied periodically and the texture and stress situation could be significantly changed.

In this work, the micro-structural evolution of irradiated Ni/Al multi-films is analyzed by TEM measurements to justify the properties change. The grain size can be obtained to be laterally oscillating between 5 to 10 nm and up to 100 nm and the layer interface to be semicoherent. Up to a certain depth, intermetallic compounds are found in the layer interface.

Keywords

thin multi-filmlaser interference metallurgystructural compositetransmission electron microscopy
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 843: Symposium T – Surface Engineering-Fundamentals and Applications , 2004 , T5.8
Copyright
Copyright © Materials Research Society 2005

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References

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