High-strain-rate superplasticity in nanocrystalline silicon nitride ceramics under compression. (1st July 2015)

• Record Type: Journal Article
• Authors: Wananuruksawong, Raayaa; Shinoda, Yutaka; Akatsu, Takashi; Wakai, Fumihiro
• Is Part Of: Scripta materialia. Volume 103(2015)
• Page Start: 22
• Page End: 25
• Publication Date: 2015-07-01
• Subjects: High-strain-rate superplasticity (HSRS) -- Silicon nitride -- Spark plasma sintering (SPS) -- Deformation; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2015.02.028
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract : Dense nanocrystalline silicon nitride (Si3 N4 ) samples were successfully fabricated at extremely low temperature of 1300 °C with high pressure 300 MPa by spark plasma sintering (SPS). The as-sintered sample consisted of equiaxed fine grains with an average grain size of 56 ± 13 nm. Nanocrystalline Si3 N4 samples exhibited superplastic deformation at high strain rate ranging from 10 −3 to 10 −2 s −1 under compression. Significant microstructural development was not observed in the deformed samples. There was no cavity damage after large deformation.