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3.40

Modern Physical Metallurgy

3-0-9 units · Graduate

Focuses on the links between the processing, structure, and properties of metals and alloys. First, the physical bases for strength, stiffness, and ductility are discussed with reference to crystallography, defects, and microstructure. Second, phase transformations and microstructural evolution are studied in the context of alloy thermodynamics and kinetics. Together, these components comprise the modern paradigm for designing metallic microstructures for optimized properties. Concludes with a focus on processing-microstructure-property relationships in structural engineering alloys. Students taking the graduate version explore the subject in greater depth.

Fall 2009 · Physical Metallurgy

Topics

  • Introduction
  • Basic crystallography; BCC, FCC, HCP structures; Miller indices; crystal symmetry; stereographic projection
  • Crystal shear stress and yielding; Burgers’ vector; introduction to edge, screw, and mixed dislocations; stress, strain, and stored energy
  • Dislocation energy; stress fields; movement of dislocations
  • Dislocation interactions; Peach-Koehler equation; effects on material behavior; Frank-Read sources; observing dislocations
  • Crystal structures and their slip systems; dislocation shear stress resolution; using stereographic projections
  • Applying stress; cross-slipping; dislocation locking; jogs and partials
  • More dislocation interactions; Orowan looping; work hardening; polycrystal deformation
  • Twinning
  • Heating metals; dislocation climb; recovery; annealing
  • Annealing; recrystallization; polygonization; coarsening; JMAK analysis
  • Recrystallization; nucleation; grain growth; effects of temperature, strain, grain size, impurities
  • Alloying and deformation; forces on dislocations
  • Solid solutions; strengthening; annealing; diffusion kinetics
  • Precipitate hardening; heat treatment; effect of time and temperature on microstructure
  • Precipitate hardening; phase boundaries; mechanisms; size effects
  • Contributions to precipitate hardening; phase diagrams; kinetics; Ostwald ripening; TTT diagrams
  • Intra-particle stresses; isostrain and isostress; modulus limits; contiguity and percolation
  • Introduction to steel; Fe-C phase diagram; phases and microstructures
  • Steel properties
  • Steel (cont.)
  • Nanocrystalline metals; properties, dislocations, and grain boundaries; applications
  • Conclusions

Readings

  • Reed-Hill, Robert E., Reza Abbaschian, and Lara Abbaschian. Physical Metallurgy Principles. 4th ed. Stamford, CT: Cengage Learning, 2008. ISBN: 9780495082545.
    Listed reading

Prerequisites & course information

Same subject as 22.71[J] Subject meets with 3.14 Prereq: ( 3.20 and 3.22 ) or permission of instructor G (Fall) 3-0-9 units

Sources