AMS_2024_1

What does the microstructure of metallic alloys represent?

• Homogeneous structure

• Bound phases

• Dispersed phases

• Compressed composition of grains and boundaries

What are dislocations in a crystal structure?

• Linear defects

• Point defects

• Surface defects

• Volume defects

What happens to the hardness of the material when the deformation speed increases?

• It decreases

• Remains unchanged

• Becomes unpredictable

• It increases

What is recrystallization in metallurgy?

• Process of reducing the volume of defects in the grain

• Process of increasing the volume of defects in the grain

• Process of formation and growth of defect-free grains

• Process of forming new defects in the grain

What parameters are used to describe crystalline planes and directions?

• Miller indices

• Hall-Petch indices

• Miller-Bravais indices

• Bravais indices

What properties affect the mechanical characteristics of a material?

• Grain size

• Type of bond between atoms

• All of the above

• Defects in the crystalline structure

What changes occur in the grain as a result of cold plastic deformation?

• Reduction of defect volume

• Increase of defect volume

• Dislocation distribution

• Dislocation accumulation

What tests are used to assess the hardness of the material?

• Brinell Test

• Hall-Petch Test

• Miller-Bravais Test

• Weiss Test

What phenomena affect the hardness of a material?

• Interaction of mobile dislocations and material defects

• All of the above

• Temperature regime

• Deformation rate

What is the main type of structure that each grain of polycrystalline metal has?

• B1

• A1

• A2

• A3