The room-temperature tensile strengths of pure copper and pure silver are 209 and 125 MPa,...

The room-temperature tensile strengths of pure copper and pure silver are 209 and 125 MPa, respectively.

(a) Make a schematic graph of the room-temperature tensile strength versus composition for all compositions between pure copper and pure silver. (Hint: You may want to consult Sections 9.10 and 9.11, as well as Equation 9.24 in Problem 9.79.)

---

(b) On this same graph, schematically plot tensile strength versus composition at 600°C.

---

(c) Explain the shapes of these two curves as well as any differences between them.

 (9.24)

Problem 9.79

Often, the properties of multiphase alloys may be approximated by the relationship

where E represents a specific property (modulus of elasticity, hardness, etc.), and V is the volume fraction. The subscripts αand β denote the existing phases or microconstituents. Use this relationship to determine the approximate Brinell hardness of a 99.75 wt% Fe–0.25 wt% C alloy. Assume Brinell hardnesses of 80 and 280 for ferrite and pearlite, respectively, and that volume fractions may be approximated by mass fractions.