18- In a design exercise for a metal matrix composite to work at 400°C without having any creep deformation, you have re

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18 In A Design Exercise For A Metal Matrix Composite To Work At 400 C Without Having Any Creep Deformation You Have Re 1 (99.45 KiB) Viewed 47 times

18- In a design exercise for a metal matrix composite to work at 400°C without having any creep deformation, you have reached the conclusion of choosing copper (Cu) or nickel (Ni) as your matrix and some borides as your reinforcing agent. Your selected fabrication method is casting. After a literature search, the following results obtained, Table below (Book by N. Eustathopoulos et al., 1999). Boride Cu Ni T(°C) Atm. 0 (deg) T (°C) Atm. 0 (deg) TiB₂ 1100 Ar 1480 He 38.5 (1) TiB₂ 158 (1) 58 (2) 1120 1500 vacuum vacuum Ar 0 (2) TiB₂ 1100 1480 20 (4) vacuum Ar 1480 72 (4) ZrB₂ 1120 vacuum 1500 vacuum ZrB₂ 1100 Ar 1480 vacuum ZrB₂ 1480 Ar TaB₂ 1100 Ar 1500 Ar CrB₂ 1430 He 50 (1) 1480 He CrB₂ 11 (1) 1100 Ar 26 (3) 1450 vacuum CrB₂ 20 (4) 1450 Ar 21 (4) (1) (Eremenko and Naidich 1959), (2) (Merz and Kotsch 1963), (3) (Samsonov et al. 1973), (4) (Samsonov et al. 1973b) Fully justify the most appropriate combination of materials and the fabrication temperature and environment for this composite. Remember as engineers, cost is an important issue to you and you need to make your best selection based on cost. 143 (3) 142 (2) 135 (3) 77 (1) 42 (2) 65 (4) 78 (4) 43 (1)