FCC Materials are usually harder Select one: True False

Which of the following statements are true of dislocations: Select one or more: a. Dislocations are spatially fixed defects b. Dislocations arise due to insertion of a foreign atom into a lattice site of a “host” metal c. Dislocations can be viewed without the aid of a microscope d. Dislocations enable plasticity in metals e. Dislocations can arise due to shear deformation of the lattice

For each question, provide an explanation, identifying the correct choice ( it is marked in red)  and explaining why it's the right answer, as well as why the other options are incorrect.

(SI units) Aluminum has a density of 2.70g/cm³ at room temperature (20°C). Determine its density at 650˚C, using data in Table 4.1 for reference.