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The constituents of alloy which is used in the manufacture of permanent magnets are:

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Hint: Alnico is an alloy which is used in the manufacture of permanent magnets. It is found to produce strong magnetic fields hence is used to produce permanent magnets.

Complete step by step answer:
- Alnico alloy is composed mainly of aluminium (Al), nickel (Ni) and cobalt (Co), hence it is named as an acronym al-ni-co.
- Alnico magnets are manufactured by casting or sintering processes .
- The composition of alnico alloys includes: 8–12% Al, 5–24% Co, and 15–26% Ni. Alnico alloys are basically ferromagnetic in nature, and are used to make permanent magnets.
- There are several properties of alnico found like:
- Alnico alloys are found to have temperature around ${{800}^{\circ }}C$, which is some of the highest Curie temperatures of any magnetic material.
- Alnico alloys are found to be magnetised to produce strong magnetic fields and thus can be used in making strong permanent magnets.
- Alnico magnets produce magnetic field strength at their poles about 3000 times the strength of Earth's magnetic field.
- Alnico magnets are electrically conductive in nature.
- It is having many uses, it is widely used in industrial applications where strong permanent magnets are needed, like: in microphones, loudspeakers, sensors, magnetron tubes, electric motors, electric guitar pickups.
- Hence, we can say that the constituents of alloy which are used in the manufacture of permanent magnets are: aluminium (Al), nickel (Ni) and cobalt (Co).

Note:
- As we know that Alnico alloy is composed mainly of aluminium (Al), nickel (Ni) and cobalt (Co) and there were several traces of copper and titanium are also found balanced with iron.
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