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Phase transformations in Mn-Al permanent magnet alloys

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Abstract

Phase transformation studies have been made of the Mn-Al alloys with compositions near the equiatomic range with or without small amounts of carbon, copper and nickel, using differential thermal analysis, X-ray diffraction and optical and electron microscopy. The high temperature hexagonalɛ phase obtained by quenching, transforms to the ferromagneticτ phase between 500 and 550° C and on further heating transforms back to the hexagonal phase between 750 and 950° C. Also, on controlled cooling of theɛ phase from about 900° C, the ferromagneticτ phase is formed between 800 and 670° C. TEM studies have shown the presence of the B19 ordered phase, ferromagneticτ phase and Mn5Al8 precipitates even in quenched alloys.

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Authors and Affiliations

  1. National Metallurgical Laboratory, 831007, Jamshedpur, India

    V. Rao, S. Pramanik, C. R. Tewari, S. R. Singh & O. N. Mohanty

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  1. V. Rao
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  2. S. Pramanik
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  3. C. R. Tewari
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  4. S. R. Singh
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  5. O. N. Mohanty
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Rao, V., Pramanik, S., Tewari, C.R. et al. Phase transformations in Mn-Al permanent magnet alloys. J Mater Sci 24, 4088–4093 (1989). https://doi.org/10.1007/BF01168979

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  • DOI: https://doi.org/10.1007/BF01168979

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