| Autor: |
Sosnin, V. V., Glezer, A. M., Zhigalina, O. M. |
| Zdroj: |
Metal Science and Heat Treatment; March 1992, Vol. 34 Issue: 3 p195-202, 8p |
| Abstrakt: |
1.In microcrystalline alloys of the systems Ni-Fe and Ni-Fe-Nb (Mo) the following features of structure formation are observed: a change in the crystallization mechanism for the melt from cellular to dendritic on alloying binary alloys with niobium; presence of high defect density of the dislocation loop type due to quenching which facilitates during heat treatment transition from a granular substructure of the rapidly quenched condition to a recrystallization structure; stabilization of the average grain size during annealing at temperatures up to 900°C in binary alloys and a considerable reduction of it in the annealing temperature range 800–900°C in alloys containing Nb(Mo); presence of a crystallographic texture characterized mainly by the ortientations {100} .2.A strengthening effect is observed for microcrystalline alloys of the system Ni-Fe-Nb prepared by quenching from the melt with low-temperature heat treatment. Strengthening of these alloys is due to the effect of crystallite refinement in the initial stages of primary recrystallization and precipitation of the Ni3Nb phase.3.Low-temperature heat treatment provides preparation of the most effective magnetic permeability in the frequency range 0.5–1 MHz for alloys Ni-16% Fe-1.5% Nb-0.5% Mo; Ni-16% Fe-4% Nb; Ni-16% Fe-6% Nb.4.Use of the rapid quenching method makes it possible to achieve a marked increase in mechanical properties of alloys of the system Ni-Fe-Nb (Mo) compared with the properties of alloys prepared by traditional technology with retention of a high level of magnetic characteristics at frequencies of 0.5–1 MHz. |
| Databáze: |
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