Abstract
In this work, we analyze the influence of the milling device in the microstructural evolution of two Fe-X-B-Cu (X = Nb, NiZr) alloys produced by mechanical alloying (MA). The two milling devices are a planetary mil (P7) and a shaker mill (SPEX 8000). Microstructural analysis by X-ray diffraction detects the formation of a Fe rich solid solution. In the Fe-Nb-B-Cu alloy produced in the shaker mill also appears a Nb(B) minor phase, whereas in the Fe-NiZr-B-Cu alloy produced in the planetary mill, a minor disordered phase is formed. The comparative study regarding the energy transferred per unit of time in both devices determines that the shaker mill is more energetic. This fact explains that in the Fe-Nb-B-Cu alloy, Nb has not been introduced in the main Fe rich phase, whereas in the Fe-NiZr-B-Cu alloy milled in the shaker mill was formed the highly disordered phase. With regard to thermal analysis, the values of the apparent activation energies of the main crystallization process (above 200 kJ/mol) correspond to the crystalline growth of the nanocrystalline Fe rich phase.
Highlights
Nanocrystalline soft magnetic alloys have been obtained by rapid solidification techniques as melt-spinning, MS, or by mechanical alloying, MA [1,2]
The minor elements were introduced in solid solution in the bcc Fe rich phase, or remains in the grain boundaries [8,9]
The results indicate that probably the milling is more energetic and efficient in SPEX
Summary
Nanocrystalline soft magnetic alloys have been obtained by rapid solidification techniques as melt-spinning, MS, (ribbon shape) or by mechanical alloying, MA (powder shape) [1,2]. Nanocrystalline Fe-(Zr, Nb)B-Cu alloys, have good magnetic properties: High effective permeability (~20,000) and low coercivity (
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