A fault is a plane dislocation. True or false?

Material Science please help

defect. A dislocation around which there is group of atoms are in irregular positions and cause atomic misalignment is referred to as a O1. interstitial O II. linear III. interfacial O IV. vacancy

When a cold-worked metal is heat-treated below its melting point over a period of time, which of the following phenomena occur? (This question has more than one correct answer) a. Strength is increased b. Dislocation density decreases c. Grain size increases d. Internal lattice strains decrease e. Ductility is reduced

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A material with a low dislocation density will have a higher yield stress as compared to a material having a high dislocation density True False

Consider a dislocation condition as shown below. A) what is the strain state in the upper region and B) how would addition of small impurity atoms in the region indicated by "*"s change it? OOOOOO ooooooo OO OO O O O O O O O O O O O O Select one: a. Tensile, would increase tensile strain b. Shear, would increase compressive strain c. Tensile, would decrease tensile strain O d. Compressive, would reduce compressive strain e. Compressive, would increase compressive strain

q1

Please type answer no write by hend.

Belongs to ductile materials that have molecular bonds that can re-form after exceeding the elastic limit. Choose all that apply -cast iron -low-carbon streel -aluminum -copper