Abstract
The structure of the Co2MnAl-type Heusler alloy in the form of a melt-spun ribbon was studied by electron microscopy, electron back-scattered diffraction (EBSD), and X-ray diffraction. The melt-spun ribbon consists of a homogeneous single-phase disordered Heusler alloy at the wheel side of the ribbon and an inhomogeneous single-phase alloy, formed by cellular or dendritic growth, at the free surface of the ribbon. Cellular growth causes the formation of an inhomogeneous distribution of the elemental constituents, with a higher Co and Al concentration in the centre of the cells or dendritic arms and a higher concentration of Mn at the cell boundaries. The EBSD analysis shows that the columnar crystals grow in the <111> crystal direction and are declined by about 10° against the direction of the spinning.
Highlights
Co2 MnAl-type Heusler alloys are studied for their high magnetic moment and relatively high spin polarization [1,2,3,4]
We study the structure and source of the compositional inhomogeneity in Co2 MnAl-type Heusler alloys prepared by melt spinning
The layer of melt that is in contact with the cold wheel is deeply
Summary
Co2 MnAl-type Heusler alloys are studied for their high magnetic moment and relatively high spin polarization [1,2,3,4]. A new method for the preparation of Heusler alloys has been introduced which uses rapid quenching by melt spinning, providing very fast cooling rates of 105 –106 K/s [8,9,10,11,12,13]. This may offer two desirable advantages: the avoidance of thermal annealing to reach a homogeneous single-phase alloy and the production of highly textured polycrystalline ribbons with improved properties along a specific direction
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