A component for use in a gas turbine engine, comprising: a first section made of a metal material; a second section made of a ceramic material; and a functionally graded section disposed between the first section and the second section; characterised in that: the component is an airfoil included in a rotor blade or a guide vane, the airfoil extending in a lengthwise direction between a leading edge and a trailing edge, and in a widthwise direction between a pressure side wall and an opposing suction side wall, the pressure side wall and the suction side wall connecting to form the leading edge and the trailing edge; the first section forms a forward portion of the pressure side wall and a forward portion of the suction side wall; and the second section forms an aft portion of the pressure side wall and an aft portion of the suction side wall, wherein a rib extends between the pressure side wall and the suction side wall, and a channel wall extends from the rib; wherein an aft cavity is disposed proximate the trailing edge of the component, and is defined between the rib, the pressure side wall, and the suction side wall; wherein a forward cavity is disposed forward of the aft cavity, and is defined between the rib and the channel wall; and wherein a forward channel is disposed proximate the leading edge of the component, and is defined by the rib, the channel wall, the pressure side wall, and the suction side wall, wherein a plurality of cooling apertures extend through the rib to permit a cooling fluid flow to pass between the aft cavity and the forward channel, wherein a plurality of cooling apertures extend through the pressure side wall, and a plurality of cooling apertures extend through the suction side wall, to permit a cooling fluid flow passing within the forward channel to be discharged from the component. a first section made of a metal material; a second section made of a ceramic material; and a functionally graded section disposed between the first section and the second section; characterised in that: the component is an airfoil included in a rotor blade or a guide vane, the airfoil extending in a lengthwise direction between a leading edge and a trailing edge, and in a widthwise direction between a pressure side wall and an opposing suction side wall, the pressure side wall and the suction side wall connecting to form the leading edge and the trailing edge; the first section forms a forward portion of the pressure side wall and a forward portion of the suction side wall; and the second section forms an aft portion of the pressure side wall and an aft portion of the suction side wall, the component is an airfoil included in a rotor blade or a guide vane, the airfoil extending in a lengthwise direction between a leading edge and a trailing edge, and in a widthwise direction between a pressure side wall and an opposing suction side wall, the pressure side wall and the suction side wall connecting to form the leading edge and the trailing edge; the first section forms a forward portion of the pressure side wall and a forward portion of the suction side wall; and the second section forms an aft portion of the pressure side wall and an aft portion of the suction side wall, wherein a rib extends between the pressure side wall and the suction side wall, and a channel wall extends from the rib; wherein an aft cavity is disposed proximate the trailing edge of the component, and is defined between the rib, the pressure side wall, and the suction side wall; wherein a forward cavity is disposed forward of the aft cavity, and is defined between the rib and the channel wall; and wherein a forward channel is disposed proximate the leading edge of the component, and is defined by the rib, the channel wall, the pressure side wall, and the suction side wall, wherein a plurality of cooling apertures extend through the rib to permit a cooling fluid flow to pass between the aft cavity and the forward channel, wherein a plurality of cooling apertures extend through the pressure side wall, and a plurality of cooling apertures extend through the suction side wall, to permit a cooling fluid flow passing within the forward channel to be discharged from the component.