Materials Science And Engineering Practice Exam

Grain boundaries are what type of defect?

Point Defects Interfacial Defects Volume Defects Point and Line defects

Correct Answer:

Interfacial Defects

Explanation:

Grain boundaries are planar defects: they form the interface between two differently oriented crystal grains in a polycrystal. Because they lie as a plane that extends through the material, they are a two-dimensional feature. Point defects are localized atoms missing or extra within the lattice, and line defects are dislocations that run through the crystal. Volume defects are three-dimensional features like voids or inclusions. Since grain boundaries are the boundary between grains and act as an interface rather than a localized point or a line, they are classified as interfacial (planar) defects.

Access more questions from this quiz

Continue to Materials Science and Engineering Practice Exam for more practice questions and the full quiz experience.

Access More Questions