Microstructure of nitrate polycrystals solidified under ultrasonic vibration

Naoya Enomoto, Yasushi Iimura, Zenbe E. Nakagawa

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    13 Citations (Scopus)


    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
    Issue number2
    Publication statusPublished - Feb 1997

    All Science Journal Classification (ASJC) codes

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


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