Structural changes in alnico alloys
1970; IEEE Magnetics Society; Volume: 6; Issue: 2 Linguagem: Inglês
10.1109/tmag.1970.1066735
ISSN1941-0069
AutoresP. Pashkov, A. Ya. Fridman, E. Granovsky,
Tópico(s)Rare-earth and actinide compounds
ResumoThe solid solution decomposition of Alnico 5 and Alnico 8 is studied by means of electron microscopy and X-rays. The following sequence of the decomposition process is found: Alnico 5: spherical zones-periodic modulated structure-rod-shaped particles of metastable tetragonal phases-final cubic phases; Alnico 8: the same sequence, but due to great importance of elastic energy at the decomposition, the three-dimensional modulated structure forms even during sharp quenching. The kinetics of modulated structure formation is studied. It is shown that the modulation wavelength increases according to a (time) n law. The activation energies of the decomposition process are determined. The spinodal mechanism of decomposition of the alloys in question is discussed.
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