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The structure of the high-temperature phase MnAl(h) and the displacive transformation from MnAl(h) into Mn5Al8

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Abstract

Splat-cooling investigations, as well as heat treatment at temperatures corresponding to the stability range of the high-temperature phase MnAl(h), show that this phase cannot be retained by quenching. Therefore, high-temperature X-ray powder diffraction was used for the determination of the crystal structure. MnAl(h) is isotypic to tungsten,a l230K = 0.3063 nm, and Im-3m. The displacive transformation from MnAl(h) into Mn5Al8 (Cr5Al8 type) was studied by means of X-ray diffraction and optical and scanning electron microscopy (SEM). For the low-temperature phase Mn5Al8, the axial ratioc/a, as well as the volume of the unit cell, was investigated in dependence on mole fraction. Crystal chemical parameters of phases isotypic to Cr5Al8 are compared.

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  1. Max-Planck-Institutfür Metallforschung, Institut für Werkstoffwissenschaft, D-7000, Stuttgart, Federal Republic of Germany

    M. Ellner (Research Associate)

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  1. M. Ellner
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Ellner, M. The structure of the high-temperature phase MnAl(h) and the displacive transformation from MnAl(h) into Mn5Al8 . Metall Trans A 21, 1669–1672 (1990). https://doi.org/10.1007/BF02672582

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