Magnetic And Other Properties of Iron Aluminum Alloys Melted in Vacuo
Magnetic And Other Properties of Iron Aluminum Alloys Melted in Vacuo
Trygve D Yensen
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COMPARED WITH UNCONTAMINATED ALLOYS. 'ANNEALED AT 1100 DEGREES C. PROPERTIES OF IRON-ALUMINUM ALLOYS MELTED IN VACUO 37 the production of high permeability, low hysteresis iron. The trans- formation of all the iron into a-iron is then a foregone conclusion. Turning now to P^g. 11, it is seen that the maximum permeability for the unannealed alloys varies from 3500 for pure iron to 600 for a 6 per cent alloy. After the alloys have been annealed at 900 degrees these values (See Frg. 12) increase t...o 24, 000 and 13, 000, respectively. The annealing at 1100 degrees (Fig. 13), although not materially affecting the pure iron, raised the maximum permeability of the 6 per cent alloy to 1. 7, 000 and that of the 0. 4 per cent alloy to about 40, 000. The maximum permeability is thus increased ten to thirty times, and the permeability for B = 15, 000, two to ten times by anneal- ing at 900 degrees. No further improvement takes place by annealing at higher temperatures: in fact, alloys low in aluminum show an actual decrease in annealing at 1100 degrees (see Fig.
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