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The heat treatment of alnico alloys at _____ results in phase separation.

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The heat treatment of alnico alloys at _____ results in phase separation.

(a) 100^oC

(b) 200^oC

(c) 400^oC

(d) 800^oC

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The query is from Soft and Hard Magnetic Materials in division Magnetic & Insulating Materials of Engineering Material & Metallurgy

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The correct answer is (d) 800^oC

Explanation: Some materials are heat treated in a magnetic field to enhance their properties. At just about 800^oC, alnico undergoes a phase separation into two phases having different compositions and amount of magnetizations.

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