Post-Midterm | MAT E 202 | Questions and Correct Answers | Latest Update 2024/2025 | 100% Pass

Post-Midterm | MAT E 202 | Questions and Correct Answers | Latest Update 2024/2025 | 100% Pass What is interdiffusion in an alloy? - Answer -In an alloy atoms tend to migrate from regions of high concentrations to regions of low concentrations. What is self-diffusion in a solid? - Answer -In an element solid atoms migrate. What are the conditions for diffusion of one atom from one lattice site to another? - Answer -1. Must have an empty adjacent site. 2. Atom must have sufficient energy to break bonds with neighbor atoms and cause some lattice distortion during displacement. What are the properties of vacancy diffusion? - Answer -Atoms exchange with vacancies and applies to substitutional impurities in atoms. The rate depends on the number of vacancies, frequency of jumping, and activation energy to exchange. Vacancy diffusion is a thermally activated process and also depends on the number of vacancies present.What are the properties of interstitials diffusion? - Answer -The small interstitial atom jumps from one interstitial site to another. This applies to interstitial impurities and is more rapid than vacandy diffusion. What are some examples in which diffusion is faster or slower for? - Answer -Faster: 1. Open crystal structures 2. Lower melting temperature materials 3. Materials with secondary bonding