Origin of intergranular embrittlement of Al alloys induced by Na and Ca segregation: Grain boundary weakening

Guang-Hong Lu, Ying Zhang, Shenghua Deng, Tianmin Wang, Masanori Kohyama, Ryoichi Yamamoto, Feng Liu, Keitaro Horikawa, and Motohiro Kanno
Phys. Rev. B 73, 224115 – Published 28 June 2006
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    Abstract

    Using a first-principles computational tensile test, we show that the ideal tensile strength of an Al grain boundary (GB) is reduced with both Na and Ca GB segregation. We demonstrate that the fracture occurs in the GB interface, dominated by the break of the interfacial bonds. Experimentally, we further show that the presence of Na or Ca impurity, which causes intergranular fracture, reduces the ultimate tensile strength when embrittlement occurs. These results suggest that the Na∕Ca-induced intergranular embrittlement of an Al alloy originates mainly from the GB weakening due to the Na∕Ca segregation.

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    • Received 29 November 2005

    DOI:https://doi.org/10.1103/PhysRevB.73.224115

    ©2006 American Physical Society

    Authors & Affiliations

    Guang-Hong Lu1,2,*, Ying Zhang1, Shenghua Deng1, Tianmin Wang1, Masanori Kohyama3, Ryoichi Yamamoto4, Feng Liu2, Keitaro Horikawa5, and Motohiro Kanno6

    • 1School of Science, Beijing University of Aeronautics and Astronautics, Beijing 100083, China
    • 2Department of Materials Science and Engineering, University of Utah, Salt Lake City, Utah 84112, USA
    • 3Research Institute for Ubiquitous Energy Devices, National Institute of Advanced Industrial Science and Technology, Osaka 563-8577, Japan
    • 4Institute of Industrial Science, University of Tokyo, Tokyo 153-8505, Japan
    • 5Division of Nonlinear Mechanics, Graduate School of Engineering Science, Osaka University, Osaka 560-8531, Japan
    • 6Department of Materials Engineering, School of Engineering, University of Tokyo, Tokyo 113-8656, Japan

    • *Electronic address: LGH@buaa.edu.cn

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    Vol. 73, Iss. 22 — 1 June 2006

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