Question

In: Chemistry

Indicate whether the following statements are correct or incorrect, and justify your answer: a)The presence of...

Indicate whether the following statements are correct or incorrect, and justify your answer:

a)The presence of more dislocations increases the yield strength of an annealed metal.

b)Dislocation move more readily in a solid solution alloy than in a pure metal.

c)A fine-grained alloy will have a higher yield strength than a corse-grained

alloy of the same chemical composition.

Solutions

Expert Solution

a). The presence of more dislocations increases the yield strength of an annealed metal. - Correct

Plastic deformation occurs when large numbers of dislocations move and multiply so as to result in macroscopic deformation. In other words, it is the movement of dislocations in the material which allows for deformation. If we want to enhance a material's mechanical properties (i.e. increase the yield and tensile strength), we simply need to introduce a mechanism which prohibits the mobility of these dislocations.

b) Dislocation move more readily in a solid solution alloy than in a pure metal. - Correct

Solid solution strengthening is a type of alloying that can be used to improve the strength of a pure metal. The strength of a material is dependent on how easily dislocations in its crystal lattice can be propagated. These dislocations create stress fields within the material depending on their character. When solute atoms are introduced, local stress fields are formed that interact with those of the dislocations, impeding their motion.

c)A fine-grained alloy will have a higher yield strength than a corse-grained alloy of the same chemical composition. - Incorrect

queen_honey_blossom answered 1 year ago
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