Hwk3: 3.67, 4.1, 4.6, 4.13, 4.16, 4.35, 4.40, 4.51
3.67 Determine the expected diffraction angle for the first-order reflection from the (310) set of planes for
BCC chromium (Cr) when monochromatic radiation of wavelength 0.0711 nm is used.
12.5 On the basis of ionic charge and ionic radii given in Table 12.3, predict crystal structures for the
Justify your selections.
This problem calls for us to predict crystal structures for s
Hwk 11: Ch.14.25, Ch.15.15,17,31; Ch.16.3,12,14
14.25 The density and associated percent crystallinity for two poly(ethylene terephthalate) materials are
(a) Compute the densities of totally
9.1 Consider the sugarwater phase diagram of Figure 9.1.
(a) How much sugar will dissolve in 1000 g of water at 80C (176F)?
(b) If the saturated liquid solution in part (a) is cooled to 20C (68F), some of the sugar will
precipitate out as
10.4 (a) For the solidification of nickel, calculate the critical radius r* and the activation free energy G*
if nucleation is homogeneous. Values for the latent heat of fusion and surface free energy are 2.53 109
J/m3 and 0.255 J/m2, respectively. Use th
Tim Becker, PhD
Feb. 12, 2015
Bring in one 8.5x11 page of handwritten notes and
equations (front & back),
example problems, concepts are acceptable on notesheet
NO additional notes (beyond 1 page
11.4 Compute the volume percent of graphite, VGr, in a 2.5 wt% C cast iron, assuming that all the carbon
exists as the graphite phase. Assume densities of 7.9 and 2.3 g/cm3 for ferrite and graphite, respectively.
To solve this problem it first be
Tim Becker, PhD
Apr. 30, 2015
Rm.017, 5/5, 12:30-2:30p (see class sched.)
Hwk9-11 solutions posted on TopHat
Quiz 1-5 open for review tonight
17. Zinc (Zn) is to be diffused into t: '7 . urface of a pure copper cfw_Cu wire. Circle the diffusion mechanism that
allows Zn to pene te intoC " '- _ interstitial diffusion Circlezhe correct term(s) Z1113 the
solvent/host 0% Cu 13 " .a
3.2 If the atomic radius of lead is 0.175 nm, calculate the volume of its unit cell in cubic meters.
Lead has an FCC crystal structure and an atomic radius of 0.1750 nm (Table 3.1). The FCC unit
cell volume may be computed from Equation 3.6 as
Hwk5: Ch.7.6,11,12,15,25,30 - due 10/13
7.6 (a) Compare planar densities (Section 3.11 and Problem 3.60) for the (100), (110), and (111) planes
(b) Compare planar densities (Problem 3.61) for the (100), (110), and (111) planes for BCC.
Hwk4: 5.9, 5.10, 5.13, 5.15, 5.27, 6.7, 6.21, 6.44, 6.49
5.9 A sheet of steel 2.5-mm thick has nitrogen atmospheres on both sides at 900C and is permitted to
achieve a steady-state diffusion condition. The diffusion coefficient for nitrogen in steel at th
Hwk6: Ch8.1,5,16,22,31,36,40 - due 10/20
8.1 What is the magnitude of the maximum stress that exists at the tip of an internal crack having a radius
of curvature of 1.9 104 mm (7.5 106 in.) and a crack length of 3.8 102 mm (1.5 103 in.) when a
2.2 Silicon has three naturally occurring isotopes: 92.23% of 28Si, with an atomic weight of 27.9769 amu,
4.68% of 29Si, with an atomic weight of 28.9765 amu, and 3.09% of 30Si, with an atomic weight of 29.9738
amu. On the basis of these data, confirm tha