J. Mater. Sci. Technol. ›› 2019, Vol. 35 ›› Issue (11): 2625-2629.DOI: 10.1016/j.jmst.2019.07.029

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The stability of deformation twins in aluminum enhanced by alloying elements

Liu Linghongab, Chen Jianghuaa*(), Fan Touwena, Shang Shunlic, Shao Qinqina, Yuan Dingwanga, Dai Yud   

  1. aCenter for High-Resolution Electron Microscopy, College of Materials Science and Engineering, Hunan University, Changsha, 410082, China
    bCollege of Science, Central South University of Forestry and Technology, Changsha, 410004, China
    cDepartment of Materials Science and Engineering, The Pennsylvania State University, University Park, PA, 16802, USA
    dAdvanced Corporation for Materials & Equipment, Changsha, 410111, China
  • Received:2019-02-20 Revised:2019-04-20 Accepted:2019-05-05 Online:2019-11-05 Published:2019-10-21
  • Contact: Chen Jianghua
  • About author:

    1The authors equally contributed to this work.

Abstract:

Introducing and stabilizing twins in aluminum is a challenge for metals research due to their high formation energy. Employing first-principles calculations, we investigated the twin boundary segregation of alloying elements and their impact on the twin boundary energy in aluminum. Alloying elements with small solubilities but strong interaction with twin boundary would significantly reduce twin boundary energies in aluminum at low temperatures. With increasing temperature, their segregation near twin boundary weakens, leading to their influence on twin boundary energies reduced. Some elements with large solubilities may greatly reduce the twin energies not only at low temperatures but also at high temperatures. Based on careful analysis of charge density and atomic radius, it has been found that chemical difference has little influence on twin boundary energy whereas the atomic size effect plays a leading role in causing the change of twin boundary energy.

Key words: Twins, Twin boundary energy, Al alloy, First-principles calculations