How does cooling and heating affects materials?

Cooling and heating can significantly affect materials by altering their physical and chemical properties. When materials are heated, they often expand, which can lead to changes in strength and flexibility, while cooling can cause contraction, potentially resulting in brittleness or cracking. These thermal changes can also affect microstructural characteristics, such as grain size and phase transitions, ultimately influencing material performance in various applications. Additionally, repeated thermal cycling can lead to fatigue and wear over time.