18. The smaller grains in metal materials may increase the material strength because
(A) grain boundaries is the barrier for dislocation motion,
(B) grain boundary may change the dislocation's direction of motion,
(C) grain boundary may make the discontinuity of slop planes,
(D) smaller grains have more grain boundaries, and
(E) all of the above.

1. What processing is often utilized to enhance the mechanical properties of metal during fabrication procedures? (A) grain growth, (B) thickness thinning, (C) recrystallization, (D) strain hardening, and (E) high-temperature annealing

2. When two atoms are separated in an equilibrium status in a solid, which description for the potential energy of the solid is correct? (A) at lowest, (B) at highest, (C) at the middle, (D) uncertain, and (E) none of the above.

3. Which is the slip system for the Face-Centered Cubic (FCC) structure? (A) {100}(110),(B) {100}(111), (C) {110}(110), (D) {110}(111), and (E) {111}(110)

4. Which one is correct in the following description about diffusion: (A) interstitial diffusion is usually not as fast as vacancy diffusion； (B) interstitial atoms are smaller, so their mobility is less； (C) copper-nickel interdiffusion belongs to interstitial diffusion, (D) carbon-iron interdiffusion belongs to interstitial diffusion, and (E) interstitial diffusion cannot occur at concentration equilibrium.

5. If it is hard to move the dislocation in metal, the metal may be (A) heavy, (B) fragile,(C) deformable, (D) at high-temperature annealing, and (E) immersion in oil.

6. Which one among the descriptions about deformation is correct: (A) elastic deformation is time-dependent and permanent, (B) elastic deformation is time- dependent and temporary, (C) inelastic deformation is time-independent and permanent, (D) inelastic deformation is time-dependent and temporary, and (E) none of the above.

7. How can you change the activation energy of diffusion in a solid? (A) to reduce temperature, (B) to short the processing time, (C) to change diffusing species, (D) to increase the concentration, and (E) it is not possible to change.

8. The number of atoms per unit cell in the face-centered cubic (FCC) structure is (A) 2,(B) 4, (C) 6, (D) 8, and (E) 10.

9. In a solid, atoms may be held together by (A) the repulse between the atomic cores, (B) electron share between adjacent pairs of atoms, (C) the proton share of the adjacent pairs of atoms, (D) the neutron share of the adjacent pairs of atoms, and (E) none of the above.

複選題10. Which solid is isotropic if its structure is (A) amorphous, (B) HCP, (C) FCC, (D) polycrystalline, and (E) BCC.

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