Abstract
In this paper, a novel approach to obtain a ferromagnetic material for smart applications was implied. A combination of mechanical alloying (MA) and plasma spheroidization (PS) was applied to produce Ni36Al27Co37 spherical powder. Then its structure was systematically studied. It was shown that homogenization of the structure occurs due to mechanism of layered structure formation. The dependence of the lamella thickness on the energy dose input at MA was defined. It was found that 14.7 W⋅h/g is sufficient to obtain lamella thickness of 1 μm and less. The low-energy mode of a planetary mill with rotation speeds of the main disk/bowl of 150/−300 rpm makes it possible to achieve a uniform element distribution upon a minimal amount of impurity. During MA in an attritor Ni3Al-type intermetallic compounds are formed that result in more intensive degradation in particle size. Plasma spheroidization of the powder after MA allowed obtaining Ni36Al27Co37 spherical powder. The powder had a fine β + γ-structure. The particle size distribution remains almost unchanged compared to the MA stage. Coercivity of the powder is 79 Oe. The powder obtained meets the requirements of selective laser melting technology, but also can be utilized as a functional filler in various magnetic composites.
Highlights
Ni-Al and Ni-Al-Co alloys are widely known and are traditionally used as heatresistant alloys, in particular, in aviation
A special place is occupied by materials with a magnetically controlled shape memory effect (MCSME) [2], which makes it possible to obtain the deformation under the action of an external magnetic field
In order to compare various modes of mechanical alloying (MA) at different mills, the parameters of process power W and input energy E are used. These parameters for a planetary mill can be calculated according to theory [25] by using the following equations: E = W·t where t—MA duration time
Summary
Ni-Al and Ni-Al-Co alloys are widely known and are traditionally used as heatresistant alloys, in particular, in aviation. It consists of the additive production of materials that change their characteristics under the influence of external factors Among these materials, a special place is occupied by materials with a magnetically controlled shape memory effect (MCSME) [2], which makes it possible to obtain the deformation under the action of an external magnetic field. A special place is occupied by materials with a magnetically controlled shape memory effect (MCSME) [2], which makes it possible to obtain the deformation under the action of an external magnetic field This deformation is several orders of magnitude higher than in traditional magnetostrictive materials. They can be used as sensors and as elements of smart structures and actuators of modern power drives Actuators based on such materials make it possible to implement various types of movements, which will provide manufacturing of materials close to the capabilities of the human muscle. There are papers indicating the possibility of using MCSME alloy powders as an internal sensor of mechanical stresses for timely prevention of critical destruction of the base metal when the powders are introduced into the base metal matrix [3,4]
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