The room-temperature tensile strengths of pure lead and pure tin are 16.8 MPa and 14.5 MPa, respectively.
(a) Make a schematic graph of the room-temperature tensile strength versus composition for all compositions between pure lead and pure tin.
(b) On this same graph schematically plot tensile strength versus composition at 150°C.
(c) Explain the shapes of these two curves, as well as any differences between them.