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110年 - 110 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#102934
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題組內容
1. Zn has a HCP structure. (a: 2.66 Å , c: 4.94 Å )
(b) Calculate linear densities in the two directions. (unit: number of atom per nm)
相關申論題
(a) Plot the basal plane and directions.
#434412
(c). Determine the indices for the planes shown in the following hexagonal cells.
#434410
2. (1) Explain the physical meaning of Brag’s law by figures, formulas, and words.
#434402
(a) the interplanar spacing for this set of planes,
#434403
(b) the lattice constant, and
#434411
(c) the atomic radius.
#434413
(a) make schematic sketches of the microstructure that would be observed for conditions of very slow cooling at the following temperatures: 1000°C, 728°C, and 726°C. Label all phases and indicate their approximate compositions.
#434404
(b) Consider the structures at 726°C, how many kilograms each of total ferrite and cementite form? How many kilograms each of pearlite and the proeutectoid phase form?
#434405
4. (a) Consider a single crystal of BCC iron oriented such that a tensile stress is applied along a [010] direction. If the applied stress is 80 MPa, compute the resolved shear stress in a direction on each of the plane (110) and (101) planes.
#434406
(b) on the basis of the resolved shear stress values, which slip system(s) is (are) most favorable ?
#434407
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