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Processing of Bulk Nanocrystalline Metals at the US Army Research Laboratory
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Microstructure Evolution in High Purity Aluminum Single Crystal Processed by Equal Channel Angular Pressing (ECAP).

Jinfang Dong1, Qing Dong2, Yongbing Dai3

  • 1Shanghai Key Laboratory of Advanced High-temperature Materials and Precision Forming, Shanghai Jiao Tong University, Shanghai 200240, China. jfangdong@hotmail.com.

Materials (Basel, Switzerland)
|August 5, 2017
PubMed
Summary
This summary is machine-generated.

High purity aluminum single crystals deformed by equal channel angular pressing (ECAP) showed poor grain refinement initially. Stable microstructures required more passes, indicating the initial state significantly impacts ECAP efficiency.

Keywords:
deformationequal channel angular pressing (ECAP)grain boundaryhigh purity aluminumsingle crystal

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Area of Science:

  • Materials Science
  • Metallurgy
  • Crystallography

Background:

  • High purity aluminum single crystals are fundamental materials in various applications.
  • Equal Channel Angular Pressing (ECAP) is a severe plastic deformation technique used for grain refinement.
  • Understanding the influence of initial microstructure on ECAP is crucial for material processing.

Purpose of the Study:

  • To investigate the grain refinement efficiency of high purity aluminum single crystals during ECAP.
  • To characterize the microstructural evolution, including grain size and misorientation, as a function of ECAP passes.
  • To determine the effect of the initial state of the aluminum single crystal on the ECAP process.

Main Methods:

  • Processing of 99.999% pure aluminum single crystals using ECAP at room temperature up to 16 passes.
  • Quantitative characterization of grain size and misorientation using Transmission Electron Microscopy (TEM) and Electron Backscatter Diffraction (EBSD).

Main Results:

  • Initial ECAP passes (n ≤ 8) resulted in poor refinement, yielding elongated grains with subgrains and low misorientations.
  • Stable microstructures with nearly equiaxed grains and high misorientations were achieved after 15 passes.
  • The initial coarse grains and uniform orientation of the high purity aluminum hindered strain energy accumulation.

Conclusions:

  • The initial state of high purity aluminum single crystals significantly affects the refining efficiency of the ECAP process.
  • A minimum number of ECAP passes is required to overcome the initial microstructural limitations and achieve significant grain refinement.
  • The findings provide insights into optimizing ECAP processing for high purity aluminum.