MECH530MaterialScience_DiffusionChp5ProbSolutions

MECH530MaterialScience_DiffusionChp5ProbSolutions - CHAPTER...

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CHAPTER 5 DIFFUSION PROBLEM SOLUTIONS Introduction 5.1 Briefly explain the difference between self-diffusion and interdiffusion. Solution 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. 5.2 Self-diffusion involves the motion of atoms that are all of the same type; therefore it is not subject to observation by compositional changes, as with interdiffusion. Suggest one way in which self-diffusion may be monitored. Solution Self-diffusion may be monitored by using radioactive isotopes of the metal being studied. The motion of these isotopic atoms may be monitored by measurement of radioactivity level. Diffusion Mechanisms 5.3 (a) Compare interstitial and vacancy atomic mechanisms for diffusion. (b) Cite two reasons why interstitial diffusion is normally more rapid than vacancy diffusion.
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  • Fall '11
  • Zanuzi
  • Atom, Molecular diffusion

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