Question

Which of the following is the slip system for the face-centered
cubic crystal structure?
A. {100}<110>
B. {110}<111>
C. {100}<010>
D. {111}<110>

To easily activate the motion of dislocations in the (111)[1 1 0] slip system in a single
crystal face-centered cubic metal, the crystal should be oriented in such a way that
A. (111) is parallel to the external force
B. (111) is perpendicular to the external force
C. (111) is parallel to the external force and [1 1 0] is perpendicular to the external
force
D. none of the above orientations occurs

Critical resolved shear stress is defined as
A. the shear stress on a slip plane and along the slip direction
B. the yield stress of a single crystal metal
C. the shear stress at 45° to the loading axis
D. the minimum shear stress required to initiate slip

The ductility of metals can be increased by
A. reducing grain sizes
B. alloying
C. annealing
D. cold work

The phase/s in tempered martensite in a steel is/are
A. face-centered cubic austenite and monoclinic Fe3C
B. body-centered cubic ferrite and monoclinic Fe3C
C. body-centered tetragonal martensite
D. none of the above

In general, which of the following steel microstructure offers the lowest hardness?
A. Spheroidite
B. Tempered martensite
C. Bainite
D. Pearlite

Answer 1