Effect of aluminum on the texture and magnetic properties of a copper bearing non-oriented silicon steel

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Abstract
It is generally known that aluminum additions in non‐oriented silicon steels reduce the core loss, yet the detailed influence of aluminum on A. C. permeability and core loss at low and high inductions has not been documented. In the present work the influence of Al levels up to 0.65 Wt% on the texture and magnetic properties of a 1.50 Wt% silicon steel containing 0.17 Wt% Cu has been determined. The results indicate that the core loss at 10 and 15 kG decreases by about 20% with the addition of 0.43 Wt% Al and is essentially unaffected by further aluminum additions: the 10 kG permeability increases linearly with increasing aluminum content. The improvement in 10 and 15 kG core losses and 10 kG permeability is primarily associated with increasing grain size, decreasing eddy current loss and changes in texture. The 15 and 17 kG permeabilities are improved by 30 and 20%, respectively with the addition of 0.15 Wt% Al and above that level are essentially independent of composition. Since a slight reduction in saturation magnetization is observed with increasing aluminum content, the improvement in the 15 and 17 kG permeabilities is explained in terms of the increase in the {200} pole density and a decrease in the {222} pole density.

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