A Polymer-Based Metallurgical Route to Produce Aluminum Metal-Matrix Composite with High Strength and Ductility

In this investigation, an attempt was made to develop a new high-strength and high-ductility aluminum metal-matrix composite. It was achieved by incorporating ceramic reinforcement into the metal which was formed in situ from a polymer by pyrolysis. A crosslinked PMHS polymer was introduced into com...

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Bibliographic Details
Published in:	Materials Vol. 17; no. 1; p. 84
Main Authors:	Gutta, Bindu, Huilgol, Prashant, Perugu, Chandra S, Kumar, Govind, Reddy, S Tejanath, Toth, Laszlo S, Bouaziz, Olivier, Kailas, Satish V
Format:	Journal Article
Language:	English
Published:	Switzerland MDPI AG 23-12-2023 MDPI
Subjects:	Alloys Aluminum Aluminum alloys Aluminum compounds Base metal Bonding strength Ceramics Ductility Emissions Energy consumption Fractures Friction stir processing Friction stir welding Grain boundaries Grain growth Grain refinement High strength High temperature Interfacial bonding Mechanical properties Metal matrix composites Particle size Particle-matrix interfaces Polymer industry Polymers Powder metallurgy Pyrolysis Scanning electron microscopy Temperature Tensile strength Tension tests India polymer-derived ceramic ductility aluminum high strength grain stability metal–matrix composite
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Summary:	In this investigation, an attempt was made to develop a new high-strength and high-ductility aluminum metal-matrix composite. It was achieved by incorporating ceramic reinforcement into the metal which was formed in situ from a polymer by pyrolysis. A crosslinked PMHS polymer was introduced into commercially pure aluminum via friction stir processing (FSP). The distributed micro- and nano-sized polymer was then converted into ceramic particles by heating at 500 °C for 10 h and processed again via FSP. The produced composite showed a 2.5-fold increase in yield strength (to 119 MPa from 48 MPa) and 3.5-fold increase in tensile strength (to 286 MPa from 82 MPa) with respect to the base metal. The ductility was marginally reduced from 40% to 30%. The increase in strength is attributed to the grain refinement and the larger ceramic particles. High-temperature grain stability was obtained, with minimal loss to mechanical properties, up to 500 °C due to the Zenner pinning effect of the nano-sized ceramic particles at the grain boundaries. Fractures took place throughout the matrix up to 300 °C. Above 300 °C, the interfacial bonding between the particle and matrix became weak, and fractures took place at the particle-matrix interface.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	1996-1944 1996-1944
DOI:	10.3390/ma17010084