(57) The present invention relates to an alloy represented by the formula (MnxAly)Cz, the alloy consisting of aluminum (Al), manganese (Mn), and carbon (C), and optionally
unavoidable impurities; wherein x = 56.0 to 59.0 y = 41.0 to 44.0 x + y = 100, and
z = 1.5 to 2.4. The alloy is highly suitable for forming the ε and τ phase in high
purity and high microstructural homogeneity. The present invention further relates
to a method for processing an alloy of formula (Mnx'A)y')Cz', wherein x' = 52.0 to 59.0, y' = 41.0 to 48.0, x' + y' = 100, and z' = 0.1 to 3.0,
the process comprising one or more of the steps a. providing the raw materials of
the alloy, melting the raw materials, and forming particles of the alloy by gas atomization
of the molten alloy; b. performing a heat treatment on the alloy at 900 - 1200 °C;
c. milling the alloy represented by formula (II) at a temperature of - 20°C or below,
preferably -100°C or lower, further preferably -150°C or lower; and/or d. performing
a heat treatment on particles of the alloy represented by formula (II) at a temperature
of 900 to 1000°C for a time of 0.5 to 20 minutes, preferably 5 to 15 minutes. Each
of these process steps, separately and in combination, facilitate the formation of
an alloy having high phase purity and allows obtaining an MnAl alloy having improved
magnetic properties.
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