Metallurgical and Materials Transactions B

, Volume 1, Issue 5, pp 1399–1406 | Cite as

Defect structures and interactions in Al-Zn eutectoid alloys

  • Eun U Lee
  • E. E. Underwood
Alloy Phases and Structure


Defect structures in superplastic and nonsuperplastic Al-Zn eutectoid alloys were studied by transmission electron microscopy. Slowly cooled alloys develop a fine lamellar microstructure and are not superplastic. The equiaxed quenched and quench-aged alloys, however, are super-plastic under the proper conditions of temperature and strain rate. Quench-aging produces sub-boundaries in the aluminum-rich α phase and dislocation loops in the zinc-rich β phase. Subsequent room temperature deformation creates a typical cold-worked dislocation structure in the α phase. At higher deformation temperatures, the cold-worked structure is increasingly replaced by a recovered structure. At the same time, the dislocation loop density in the β phase decreases to lower values. During superplastic deformation at 250βC, the dislocation loops in the β phase are annihilated by interactions with glide dislocations. In the α phase, a continuous, or steady-state, dynamic recovery process appears to operate. A completely recovered structure is maintained with dislocation-free subgrains.


Dislocation Loop Vacancy Concentration Dislocation Network Superplastic Deformation Room Temperature Deformation 
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Copyright information

© The Minerals, Metals & Materials Society - ASM International - The Materials Information Society 1970

Authors and Affiliations

  • Eun U Lee
    • 1
  • E. E. Underwood
    • 1
  1. 1.Materials Research and Development Laboratory, Lockheed-Georgia CompanyMarietta

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