Yttria Dispersion Strengthened Nickel-based Superalloy by Mechanical Alloying

• Published in: Transactions of the Indian Ceramic Society Vol. 70; no. 3; pp. 125 - 130
• Main Authors: Mohan, Monika, Subramanian, S., Angelo, P. C.
• Format: Journal Article
• Language: English
• Published: Taylor & Francis Group 01.07.2011
• Subjects: Alloying; Ball milling; Economics; Mechanical alloying; Nanostructure; Nickel base alloys; ODS Ni-based alloy; SPS compaction; Superalloys; Yttrium oxide
• ISSN: 0371-750X; 2165-5456
• DOI: 10.1080/0371750X.2011.10600158

Department of Metallurgical Engineering PSG College of Technology Coimbatore - 641 004, Tamil Nadu, IndiaPresent work involves preparation of nano sized yttria dispersed nickel-based superalloy by mechanical alloying (MA) in a planetary ball mill and optimization of process parameters. Nanocrystalline (NC) yttria was synthesized using a simple and economical sol-gel route. Elemental powders of composition Ni-20Cr-3Fe-0.5Ti-0.3Al-0.6Y 2 O 3 wt% were mechanically alloyed at various milling times (5-40 h) in dry milling. Purity of the alloy and phase evolution was characterized by XRD. The alloying behaviour, particle size, particle shape and compositional analysis were done by SEM/EDAX. TEM of MA powders showed grain size in the micrometer range. The powders were consolidated by spark plasma sintering at temperatures from 1173-1373 K and microhardness measurements were also done. The sample sintered at 1173 K had the highest hardness; higher than that reported in the literature.