Development of Ni-Al2O3In-Situ Nanocomposite by Reactive Milling and Spark Plasma Sintering |
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| Authors: | V Udhayabanu K R Ravi K Murugan D Sivaprahasam and B S Murty |
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| Affiliation: | (1) Department of Metallurgical Engineering, PSG College of Technology, Coimbatore, 641 004, India;(2) Department of Metallurgical and Materials Engineering, Indian Institute of Technology Madras, Chennai, 600 036, India;(3) PSG, Institute of Advanced Studies, Coimbatore, 641 004, India;(4) International Advanced Research Centre for Powder Metallurgy and New Materials (ARCI), Hyderabad, 500 005, India;; |
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| Abstract: | In the present study, Ni-30 vol pct Al2O3
in-situ nanocomposite was developed by reactive milling of NiO-Al-Ni powder mixture followed by spark plasma sintering (SPS). During
milling, fcc to hcp transformation was observed in Ni(Al) phase and it transformed back to fcc phase around 773 K (500 °C).
The hardness and yield strength of Ni-30 vol pct Al2O3 nanocomposite are approximately two times higher than that of pure Ni of similar grain size. The improved mechanical properties
of nanocomposite are attributed to the presence of alumina particles of nanometer size. |
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