Question

Range of composition over which copper base alloys is precipitation hardened with cu3sn

Answer 1

Answer:

Cu-rich Cu-Sn alloys are precipitation hardenable. After consulting the binary phase diagram shown below, do the following: (a) Specify the range of compositions over which these Cu-base alloys may be precipitation hardened with CuSn as the second phase for strengthening. Determine the composition (in both wt.% and at.%) of this second phase. (b) Briefly describe the heat-treatment procedures in terms of temperatures) that would be used to precipitation harden an alloy having a composition that lies in the middle of the range given for Part (a). 1200+ 1000- Liquid 800- T(°C) CuoSn3 Cu, Sn, CuSn, CuSno Cu, Sn (Sn) 0 + 10 20 30 70 80 90 100 40 50 60 Mass % Cu Sn Cu Phase Diagram of the Sn-Cu System

Explanation: