Ciencias dos materias

Disponível somente no TrabalhosFeitos
  • Páginas : 2 (356 palavras )
  • Download(s) : 0
  • Publicado : 6 de junho de 2011
Ler documento completo
Amostra do texto
9-8

Interpretation of Phase Diagrams
9.8 This problem asks that we cite the phase or phases present for several alloys at specified temperatures. (a) For an alloycomposed of 15 wt% Sn-85 wt% Pb and at 100°C, from Figure 9.8, α and β phases are present, and Cα = 5 wt% Sn-95 wt% Pb Cβ = 98 wt% Sn-2 wt% Pb (b) For an alloy composed of25 wt% Pb-75 wt% Mg and at 425°C, from Figure 9.20, only the α phase is present; its composition is 25 wt% Pb-75 wt% Mg. (c) For an alloy composed of 85 wt% Ag-15 wt% Cuand at 800°C, from Figure 9.7, β and liquid phases are present, and Cβ = 92 wt% Ag-8 wt% Cu CL = 77 wt% Ag-23 wt% Cu (d) For an alloy composed of 55 wt% Zn-45 wt% Cu andat 600°C, from Figure 9.19, β and γ phases are present, and Cβ = 51 wt% Zn-49 wt% Cu Cγ = 58 wt% Zn-42 wt% Cu

(e) For an alloy composed of 1.25 kg Sn and 14 kg Pb andat 200°C, we must first determine the Sn and Pb concentrations (using Equation 4.3), as
1.25 kg × 100 = 8.2 wt% 1.25 kg + 14 kg 14 kg × 100 = 91.8 wt% 1.25 kg + 14 kgCSn =

C Pb =

From Figure 9.8, only the α phase is present; its composition is 8.2 wt% Sn-91.8 wt% Pb. (f) For an alloy composed of 7.6 lbm Cu and 144.4 lbm Zn andat 600°C, we must first determine the Cu and Zn concentrations (using Equation 4.3), as
Excerpts from this work may be reproduced by instructors for distribution on anot-for-profit basis for testing or instructional purposes only to students enrolled in courses for which the textbook has been adopted. Any other reproduction ortranslation of this work beyond that permitted by Sections 107 or 108 of the 1976 United States Copyright Act without the permission of the copyright owner is unlawful.

tracking img