Alloying and Annealing Effects on Grain Boundary Character Evolution of Al-alloy 7075 Thin Films: An ACOM-TEM Analysis

  • Prakash Parajuli
  • Rubén Mendoza-Cruz
  • Miguel José Yacamán
  • Arturo PonceEmail author
Conference paper
Part of the The Minerals, Metals & Materials Series book series (MMMS)


Since polycrystalline materials consist of a complex network of various types of grain boundaries (GBs), a detailed study on the types of the GBs, their distribution and how they are connected is crucial to further enhance the material’s performance. Herein, the GB character distribution (types and connectivity) of as-deposited Al and Al-alloy 7075 thin films, as well as annealed Al-alloy thin films, was investigated using an advanced microscopic technique: ACOM-TEM. Annealing processes up to 12 h caused a decrease in the content ratio of random high-angle GBs (r-HAGBs) and triple junctions comprised of r-HAGBs. However, there was no significant consequence of alloying in the GB type and connectivity distribution. Furthermore, our results indicate that vacuum-deposited Al or Al-alloy thin films possess a strong <111> texture, and a characteristic GB distribution consisting of a significantly high fraction of low coincidence site lattice GBs (predominant ∑1 followed by ∑13b, ∑7, ∑21a, ∑31a and ∑19b in descending order) and a minor fraction of r-HAGBs.


Grain boundaries Thin films Alloying Annealing Triple junction ACOM-TEM 



The authors are thankful to the Welch Foundation Grant (No. AX-1615) and Department of Defense Grant (No. 64756-RT-REP and 72489-RT-REP). RMC acknowledges the National Council for Science and Technology (Conacyt), Mexico, for the support provided through the Postdoctoral Scholarship Program.


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Copyright information

© The Minerals, Metals & Materials Society 2019

Authors and Affiliations

  • Prakash Parajuli
    • 1
  • Rubén Mendoza-Cruz
    • 1
  • Miguel José Yacamán
    • 1
  • Arturo Ponce
    • 1
    Email author
  1. 1.Department of Physics and AstronomyUniversity of Texas at San AntonioSan AntonioUSA

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