Self-diffusion is atomic migration in pure metals-i.e., when all atoms exchangin

Question

Self-diffusion is atomic migration in pure metals-i.e., when all atoms exchanging positions are of the same type. Interdiffusion is diffusion of atoms of one metal into another metal. In Non steady-state diffusion concentration is a function of position only. Amorphous materials have a systematic and regular (periodic) arrangement of atoms over relatively large atomic distances. For substitution solid solution impurity atom goes into the interstitial sites among the host atoms. Yield strength, Toughness and Ductility are sensitive to any prior deformation for example presence of impurities, and or heat treatment to which metal has been subjected. Toughness is the amount of energy absorbed under elastic deformation in polycrystalline materials the crystal with largest T_R yields first and other crystals yield later. Some metals as non-metals may have more than one crystal structure a phenomena knowns as polymorphism. For example pure iron. The atomic packing factor for the HCP crystal structure is the same as for FCC crystal structure. Tensile strength is the stress at the maximum on the engineering stress and stain curve. Plastic deformation lakes place due to slip or motion of dislocation.

Explanation / Answer

A) True

B) FALSE

A) FALSE

C) TRUE

D) TRUE

E) TRUE

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