There are invar missiles.
Invar can be used as magnetic core material, but there are better choices. Invar is alloyed for its thermal stability. It is iron with a good percentage of nickel. Remember that magnetic core material is usually laminated or is "powdered" in a way to electrically isolate the "bits" of core material so eddy currents will be reduced. A link is posted to the article on Invar put up by our friends at Wikipedia, where knowledge is free.
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Invar steel is used in applications that require low thermal expansion, such as precision instruments, clocks, and scientific devices. Its low coefficient of thermal expansion helps it maintain dimensional stability over a wide range of temperatures.
missiles are used to shoot flying objects down from the sky
Because Invar steel expands and contracts very little with changes in temperature.
Invar is used in pendulum clocks because of its low coefficient of thermal expansion, which makes it less likely to expand or contract with changes in temperature. This helps the clock maintain its accuracy by preventing the pendulum's length from changing due to temperature fluctuations.
Missiles are used for a wide variety of military purposes. They are known to be used to destroy weapons collections and hideouts. New technology has made missiles amazingly accurate.
Invar
Theater Ballistic Missiles (TBM)
Invar (a special iron - nickel alloy) is used in pendulam instead of aluminium ,in order to decrease the expansivity.
Invar is often used to make accurate technical instruments for hot situations because it has a very low thermal expansion coefficient, meaning it does not expand or contract much with temperature changes. This stability helps maintain the precision and accuracy of the instruments even in high-temperature environments where other materials might deform or lose calibration.
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