please help with 36 310 321 323 All parts of an alloy with t

please help with 3.6, 3.10, 3.21, 3.23

All parts of an alloy with the same physical and chemical properties and the same composi- tion are parts of a single phase The Al-Si, Cd-Zn, and Al-Cu alloys are all made up of two phases. EXAMPLES 3.6 You heat pure copper. At 1083 C it starts to melt. While it is melting, solid and liquid copper coexist. Using the definition above, are one or two phases present? Why? Three components A, B, and C of an alloy dissolve completely when liquid but have no mutual solubility when solid. They do not form any chemical compounds. How many phases, and of what compositions, do you think would appear in the solid state? Phases Compositions 3.7 The constitution of an alloy

Solution

3.6 When we heat pure copper. At 1083 C it starts to melt. While it is melting, solid and liquid copper co-exist. accoring to this definition there are two phases present : Liquid and Solid

Because they have the same chemical composition, they differ in physical properties.

3.23   (a) 2 phases

(b) W_Pb = 2%

W_Pb = 90%

(c) The lead-rich solid.

(d) Tin-rich solid 11% of total weight.

Lead-rich solid 89% of total weight (by figure)

3.21 (a) Liquid plus lead-rich solid at 250 C

X_Pb = 53% in the liquid

X_Pb = 79% in the solid.

(b) Liquid plus lead-rich solid at 200 C

X_Pb = 33% in the liquid

X_Pb = 73% in the solid.

(c) Tin-rich solid plus lead-rich solid at 150 C

X_Pb = 1% in the tin-rich solid

X_Pb = 83% in the lead-rich solid.

(d) (See Fig.) The compositions of the phases can change provided that their relative proportions change so as to lead to the same overall alloy composition. In practice changes in phase composition occur by diffusion.

3.10 (a) 50%, 50%, 300 degree centigrade.(see fig)

  (b) Liquid

1 phase

  (c) Liquid plus lead-rich solid

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