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Polymer Derived In-Situ Nano Metal Matrix Composites Obtained by Friction Stir Processing

Kumar, PA and Raj, R and Kailas, SV (2015) Polymer Derived In-Situ Nano Metal Matrix Composites Obtained by Friction Stir Processing. In: 30th Technical Conference of the American-Society-for-Composites, SEP 28-30, 2015, East Lansing, MI, pp. 2368-2382.

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Official URL: http://dpi-proceedings.com/index.php/ASC30/article...


Friction Stir Processing (FSP) is a solid state technique used for material processing. Tool wear and the agglomeration of ceramic particles have been serious issues in FSP of metal matrix composites. In the present study, FSP has been employed to disperse the nanoscale particles of a polymer-derived silicon carbonitride (SiCN) ceramic phase into copper by an in-situ process. SiCN cross linked polymer particles were incorporated using multi-pass FSP into pure copper to form bulk particulate metal matrix composites. The polymer was then converted into ceramic through an in-situ pyrolysis process and dispersed by FSP. Multi-pass processing was carried out to remove porosity from the samples and also for the uniform dispersion of polymer derived ceramic particles. Microstructural observations were carried out using Field Emission Scanning Electron Microscopy (FE-SEM) and Transmission Electron Microscopy (TEM) of the composite. The results indicate a uniform distribution of similar to 100 nm size particles of the ceramic phase in the copper matrix after FSP. The nanocomposite exhibits a five fold increase in microhardness (260HV(100)) which is attributed to the nano scale dispersion of ceramic particles. Tensile properties of the produced metal matrix composite were significantly higher than processed plain specimen and base metal.

Item Type: Conference Proceedings
Additional Information: Copy right for this article belongs to the DESTECH PUBLICATIONS, INC, 439 DUKE STREET, LANCASTER, PA 17602-4967 USA
Keywords: Friction stir processing; Nano metal matrix composites; Polymer derived ceramics; Mechanical behaviour; Nano particles
Department/Centre: Division of Mechanical Sciences > Mechanical Engineering
Date Deposited: 22 Jun 2016 06:21
Last Modified: 22 Jun 2016 06:21
URI: http://eprints.iisc.ac.in/id/eprint/54068

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