MMET Exam 1 Review.docx - MMET Practice Exam 1 1 What are the three types of Bonds Body centered cubic face centered cubic and the hexagonal close

MMET Exam 1 Review.docx - MMET Practice Exam 1 1 What are...

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MMET Practice Exam 1 1.What are the three types of Bonds? 2. 3.List the characteristics of the following unit cells: 2. 3. 4.The appearance of more than one type of crystal structure in metal is known as 4.Explain the difference between elastic and plastic deformation: 6. Slip occurs when atoms are sparsely packed (True or False) 6. Twinning is a type of plastic deformation ( True or False) 6. Metals with 3 or more slip systems are ductile (True or False) 6. The higher the b/a ratio, the less shear stress is required to create a slip plane ( True or False) 6. 11.Why does having more slip systems not equate to higher probabilities of slip? 12.Please list and explain the four imperfections:
d. Planar or 2D imperfections: such as grain boundaries and phase boundaries 12. Each grain consists of_ single________ crystal for pure materials and _polycrystalline________ aggregate for alloys. 12. Grain boundaries have an important influence on the _ Strength_______ and _ ductility________of metals. 15.The number and size of grains depends on all of the following factors EXCEPT: 16.Grain size influences the _strength, ductility of metals, and strain hardening ________________.

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