Microstructure of nitrate polycrystals solidified under ultrasonic vibration

Naoya Enomoto, Yasushi Iimura, Zenbe E. Nakagawa

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Molten nitrates in the system (1 - x)NaNO3-xBa(NO3)2 were solidified in the presence of a power ultrasound of 20 kHz. Their microstructures were compared with those of controlled samples which were solidified normally. Grain size in the controlled sample of monolithic NaNO3 (x = 0) was reduced by sonication. In the hypo-(x = 8 wt. %) and the hypereutectic (x = 28 wt. %) binary samples, the sonication completely eliminated the dendritic structure of the primary crystals and induced equiaxed particles of the primary phase. At eutectic (x = 18 wt. %), the sonication removed oriented structures of the eutectic lamellae. Several mechanisms of the microstructural modification were mentioned.

Original languageEnglish
Pages (from-to)371-376
Number of pages6
JournalJournal of Materials Research
Volume12
Issue number2
DOIs
Publication statusPublished - Feb 1997

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All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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