《材料科学与工程基础》英文影印版习题及思考(6)

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phase of composition 92 wt% Ag–8 wt% Cu, and also a liquid phase of

composition 76 wt% Ag–24 wt% Cu? If so, what will be the approximate

temperature of the alloy? If this is not possible, explain why.

10.20 A copper–nickel alloy of composition 70 wt% Ni–30 wt% Cu is slowly heated

from a temperature of 1300_C .

(a) At what temperature does the first liquid phase form?

(b) What is the composition of this liquid phase?

(c) At what temperature does complete melting of the alloy occur?

(d) What is the composition of the last solid remaining prior to complete

melting?

10.28 .Is it possible to have a copper–silver alloy of composition 50 wt% Ag–50 wt%

Cu, which, at equilibrium, consists of _ and _ phases having mass fractionsW_ _ 0.60 and W_ _ 0.40? If so, what will be the approximate temperature of the alloy? If such an alloy is not possible, explain why.

10.30 At 700_C , what is the maximum solubility (a) of Cu in Ag? (b) Of Ag in Cu?

第三章 习题和思考题

3.3 If the atomic radius of aluminum is 0.143nm, calculate the volume of its unit

cell in cubic meters.

3.8 Iron has a BCC crystal structure, an atomic radius of 0.124 nm, and an atomic

weight of 55.85 g/mol. Compute and compare its density with the experimental value found inside the front cover.

3.9 Calculate the radius of an iridium atom given that Ir has an FCC crystal structure,

a density of 22.4 g/cm3, and an atomic weight of 192.2 g/mol.

3.13 Using atomic weight, crystal structure, and atomic radius data tabulated inside

the front cover, compute the theoretical densities of lead, chromium, copper, and cobalt, and then compare these values with the measured densities listed in this same table. The c/a ratio for cobalt is 1.623.

3.15 Below are listed the atomic weight, density, and atomic radius for three

hypothetical alloys. For each determine whether its crystal structure is FCC,

BCC, or simple cubic and then justify your determination. A simple cubic unit cell is shown in Figure 3.40.

3.21 This is a unit cell for a hypothetical

metal:

(a) To which crystal system does

this unit cell belong?

(b) What would this crystal structure be called?

(c) Calculate the density of the material, given that its atomic weight is 141

g/mol.