Thermally stressed component

A component subjected to zonally differential thermal stress for engines, machinery or other devices, in particular a component for combustion engines. In these components, in order to arrange more favourably the stress variation as a function of temperature in the thermally highly stressed parts or regions, so that the adjoining colder regions do not reduce or hinder its expansion, in the material of the component, for example a piston of a combustion engine, in the neighbourhood of the zones of higher thermal loading, at least one closed hollow chamber is provided which is completely filled with a substance which has a higher coefficient of thermal expansion than that of the material of the component surrouding the chamber.