課程名稱︰材料科學
課程性質︰必修
課程教師︰林輝政
開課學院：工學院
開課系所︰工科海洋
考試日期（年月日）︰99/11/08
考試時限（分鐘）：100
是否需發放獎勵金：是
（如未明確表示，則不予發放）
試題 :
1.Calculate the force pf attraction between a Ca^(2+) and an O^(2-) ionic
the center of witch are separated by adistance of 1.25 nm (6 pionts)
2.Some hypothetical mental has the simple cubic crystal structure shown in
figure 1. If the its atomic weight is 74.5g/mol and the atomicradius is
0.145 nm, compute its density.(6 pionts)
3.Derive planar density expressions for FCC(100)and(110)planes in terms of
the atomic radius R.(6 points)
4.Determine the Miller indices for the plane shown in the accompanying
sketch in Figure 2.(8 points)
5.What is the composition, in atom persent, of an alloy that contain 33g
copper and 47g zinc?(8 points)
6.Determine the approximate density of a Ti-6AI-4V titanium that has a
composition of 90 wt% Ti,6 wt% Al, and 4 wt% V.(8 points)
7.Determine the ASTM grain size number if 25 grains per square inch are
measured at a magnification of 75.(8 points)
8.Determine the carburizing time necessary to achieve a carbon concentration
of 0.30 wt% at a position 4 mm into an iron-carbon ally that initially
contains 0.10 wt% C, and the treatment is to be conducted at 1100 *C.
Use the data in Table 1 and Table 2.(10 points)
9.Carbon is allowed to diffuse though a steel plate 10 mm thick. The
concentrations of carbon at the two face are 0.85 and 0.40 kg-C/cm^3 Fe.
which are maintained constsnt. if the preexponential and activation
enery are 6.2*10^-7 m^2/s and 80,000 j/mol,respective, compute the
temperatureat which the diffusion flux is 6.3*10^-10 kg/m^2-s.(8 points)
10.A cylindrical bar specimen of some mental alloy 10 mm in diameter is
stressed elatically in tension. A force of 15000 N produces a reduction
in specimen diameter of 7*10^-3 mm. Compute Poisson's ratio for this
material if its elatic modulus is 100 GPa.(8 points)
11.A cylindrical mental specimen having an original diameter of 12.8 mm
and gauge length of 50.80 mm is pulled in tension until facture occur.The
diameter at the point of fracture is 8.13 mm,and the fracture gauge length
is 74.17 mm. Calculate the ductility in terms of persent reduction in
area and percent reduction in area and percent elongation.(10 points)
12.Caculate the atomic paking for HCP(see Figure 3).(10 points)
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