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109年 - 109 國立高雄大學_碩士班招生考試_化學工程及材料工程學系：材料科學導論#103100
> 申論題
2. Please draw the HCP crystal structure, and show that the ideal c/a ratio is 1.633. (10%)
相關申論題
(a) Determine the phases present, compositions of the phases, and relative amounts (weight fractions) of the phases at a temperature just above the eutectic temperature.
#435172
(b) Determine the phases present, compositions of the phases, and relative amounts (weight fractions) of the phases when solidification is just complete (at a temperature just below the eutectic temperature).
#435173
(c) Sketch the 50 wt.% silver alloy at a temperature just below the eutectic temperature. Label both the phases and the microconstituents.
#435174
(d) Determine the fractional amounts (weight fractions) of microconstituents at a temperature just below the eutectic temperature.
#435175
4. The microstructures of two precipitation hardenable aluminum alloy specimens of the same composition are shown below (Fig. 2). The magnification for both A and B micrographs is about 500x. Which specimen would have higher hardness? Briefly explain your answer. (10%)
#435176
5. Briefly describe the microstructure and characteristics of pearlite and spheroidite? Which is more stable, the pearlitic or the spheroiditic microstructure? Why? (10%)
#435177
6. The electrical conductivity and electron mobility for aluminum areand 0.0012 m2 /V●s, respectively. Calculate the Hall voltage for an aluminum specimen that is 15 mm thick for a current of 25 A and a magnetic field of 0.6 tesla (imposed in a direction perpendicular to the current). (10%)
#435178
7. What three kinds of structural metals or alloys does “light metals” usually mainly include? Please write down the structure, properties and applications of these three metals. (10%)
#435179
(c) the atomic radius.
#434413
(a) Plot the basal plane and directions.
#434412
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