義守大學 94 學年度博士班入學招生考試試題
系所別 材料科學與工程學系 考試日期 94/06/25
考試科目 材料科學 總頁數 1
※ 此為試題卷，考生請於答案卷上作答。
※ 本考科可使用計算機、不可使用字典。
第 1 頁
1. Why could catastrophe of giant boat “ Titanic” at the beginning of 20th century happen? As a materials engineering how to solve this problem?
(20%)
2. Please describe the functions of the following treatments: (a) Annealing (b) Homogenization (c) Tempering (d) Normalizing (e) Spheroidizing (f) Age Hardening.(20%)
3. How to improve the resolution of scanning electron microscope ?(20%)
4. If Fick’s 2nd law in spherical coordinate (neglecting the angular dependence)
is ⎭⎬⎫
⎩⎨
⎧ ⎟
⎠
⎜ ⎞
⎝
⎛
∂
∂
∂
⋅ ∂
=
∇
∂ =
∂
r r c r r D 1 c t D
c 2
2
2
Please derive an expression for the steady state molar flux density (moles/cm2/s) of oxygen out of Nb2O5 spheres undergoing reduction
assuming that the oxygen pressure at the surface is that at stoichiometry and that in the gas is p(O2)=10-12 atm. Assume that diffusion in the gas phase is rate-controlling. (20%)
5. Consider a metal single crystal oriented such that the normal to the slip plane and the slip orientation are at the angle of 60o and 30o, respectively, with the tensile axis. If the critical resolved shear stress is 3000 psi, will an applied stress of 6500 psi cause the single crystal to yield? If not, what stress will be necessary?(20%)
