100%(1)1 out of 1 people found this document helpful
This preview shows page 1 - 3 out of 13 pages.
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 ________________.