Synthesis of the Supermalloy Powders by Mechanical Alloying |
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Authors: | I Chicinas V Pop O Isnard |
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Affiliation: | 1. Department of Materials Science and Technology, Technical University of Cluj-Napoca, 103-105 Muncii Ave., 400641, Cluj-Napoca, Romania. 2. Faculty of Physics, Babes-Bolyai University, Cluj-Napoca, Romania 3. Laboratoire de Cristallographie, CNRS, associé à l'Université J. Fourier, BP 166, 38042, Grenoble cedex 9, France
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Abstract: | The mixture of the Ni, Fe and Mo elemental powders with the nominal composition of the Supermalloy was milled in a planetary mill under Ar atmosphere. Several milling times have been used ranging from 4 to 16 h. A heat treatment of 30 min, 1, 2 and 4 h at temperature of 350°C has been performed in vacuum in order to improve the alloying process and remove the internal stresses. The formation of the Fe-Ni-Mo alloys by mechanical alloying was evidenced by X-ray diffraction. The nanocrystalline Supermalloy powders have been obtained after 16 h milling and after 8 h milling followed by 4 h annealing. A typical grain size of 11 ± 2 nm have been obtained after 16 h milling. The chemical homogeneity composition and the morphology of the powder particles have been studied by X-ray microanalysis and scanning electron microscopy respectively. |
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