are al ansion of ceramics,.metals and polymers using the symbol“<”or“>n. For eva mpe The hardness of ceramics is greater than metals.Thus,the comparison is expressedas ceramics>metals.(2pts) Thermal expansion:A) From the above comparison,B) have the lowest CTE and C) have the weakest bonding forces among the aforementioned materials. 2.Determine the miller indices of the crystal direction for the line passing through point A with coordinates 2/3.1,0 and the origin of the unit cell shown in Figure 1(4pts) c=1 /B:000 a=1 A b=123,1,0 Fig 1Acubic unit cell 3.Figure 2 is a stress-strain diagram.1)Label A)tensile strength,B)yield strength,C)plastic region,D)elastic region,E)Modulus of elasticity,2)Is this stress-strain diagram for a ductile material or a brittle material?Give two reasons to support your answer.(4 points) Fig 2 A stress-strain diagram 第7而第 7 页 VII. Complex questions. (10points) 1. Compare the thermal expansion of ceramics, metals and polymers using the symbol “<” or “>”. For example: The hardness of ceramics is greater than metals. Thus, the comparison is expressed as ceramics > metals. (2pts) Thermal expansion: A) From the above comparison, B)______________ have the lowest CTE and C)____________ have the weakest bonding forces among the aforementioned materials. 2. Determine the miller indices of the crystal direction for the line passing through point A with coordinates 2/3, 1, 0 and the origin of the unit cell shown in Figure 1 (4pts) Fig. 1 A cubic unit cell 3. Figure 2 is a stress-strain diagram. 1) Label A) tensile strength, B) yield strength, C) plastic region, D) elastic region, E) Modulus of elasticity; 2) Is this stress-strain diagram for a ductile material or a brittle material? Give two reasons to support your answer. (4 points) Fig. 2 A stress-strain diagram x z y c=1 b=1 B: 0, 0, 0 a=1 2/3, 1, 0 A x z y c=1 b=1 B: 0, 0, 0 a=1 2/3, 1, 0 A