Microstructure and mechanical behavior of polymer-derived in-situ ceramic reinforced lightweight aluminum matrix composite

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[1] [1,2,Pariyar, Abhishek
[2] Perugu, Chandra S.
[3] 2,Toth, Laszlo S.
[4] Kailas, Satish V.
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Pariyar, Abhishek (abhishekp@iisc.ac.in) | 1600年 / Elsevier Ltd卷 / 880期
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Metal/alloy matrices have been previously reinforced with ceramic nanoparticles; but such reinforcements tend to agglomerate; have weak interfaces; and are expensive. Polymer-derived ceramics (PDCs) based composites can potentially overcome these shortcomings. These composites are obtained from the preceramic polymers after pyrolysis. These polymers are inexpensive; can be fragmented to the nanoscale; and pyrolyzed in-situ. Friction stir processing (FSP) was used to fragment and disperse the polymer within an Al-Mg alloy. The PDC particles pinned the dislocations and grain boundaries. The composite exhibited a microstructure resulting from dynamic recrystallization with an average grain size of ~1 µm. It also exhibited both high strength (96% and 24% improvement in the yield and tensile strength; respectively) and good ductility. Interestingly; the serrations in the tensile curves commonly observed in Al-Mg alloys due to the Portevin-Le Chatelier (PLC) effect was reduced in the composite. © 2021 Elsevier B.V;
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