The elasticity of invar

The correct option is Does not depend on temperature.

Invar, also known as FeNi36, is a nickel-iron alloy containing approximately 36% nickel. It is famous for its uniquely low coefficient of thermal expansion, meaning its physical dimensions change very little with variations in temperature.

For most typical metals and alloys, elasticity (such as Young's modulus) decreases as the temperature rises. This happens because the increased thermal energy causes greater atomic vibrations and increases the average spacing between atoms, making the atomic bonds easier to stretch.
However, Invar exhibits anomalous thermoelastic behavior. Due to magnetic interactions (the Invar effect) that counteract the normal thermal effects, the elastic modulus of Invar remains remarkably constant over a broad temperature range. Consequently, its elasticity does not depend on temperature changes under standard operating conditions.