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V.—On the Magnetism of the Copper-Manganese-Tin Alloys under varying Thermal Treatment

Published online by Cambridge University Press:  15 September 2014

Alexander D. Ross  and
Robert C. Gray
Alexander D. Ross
Affiliation:
University of Glasgow
Robert C. Gray
Affiliation:
Houldsworth Research Scholar, University of Glasgow
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Summary

1. Alloys were prepared containing 14, 16, 18, 30, 38, and 48 per cent, of tin, and the remainder copper and manganese in the ratio 7 : 3.

2. Tests were carried out at different temperatures on the materials as cast, normalised, annealed, and quenched.

3. At 15° C in the normalised condition the six alloys gave I respectively equal to 55, 77, 82, 0·4, 96, and 1, for H = 100.

4. When cooled to −190° C the three alloys poor in tin were much more magnetic.

5. Annealing produced no decided improvement.

6. The susceptibility diminishes with increase of temperature, and the critical temperatures range from 225° to 275−190° C.

8. Reannealing tends to restore the initial susceptibility of the quenched material, but has little influence on the coercive force.

9. The magnetic properties are probably due to the formation of solid solutions of certain definite concentrations.

Type
Research Article
Information
Proceedings of the Royal Society of Edinburgh , Volume 31 , 1912 , pp. 85 - 99
Copyright
Copyright © Royal Society of Edinburgh 1912

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References

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page 86 note * Melting points:—Manganese 1260°, copper 1084°, tin 227°C.

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page 91 note * The 18 per cent, tin alloy is to a slight extent an exception. The increase in susceptibility produced by cooling to − 190° C. is subsequently a little less, but the coercive force, critical temperature, etc., have not been altered. Here the thermal treatment seems to have been partly normalising and partly annealing, the alloy being very sensitive to heat effects.

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