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Characterization of strengthened rapidly quenched Zr-based alloys

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Abstract

The nominal composition components of alloy Zr66.4Nb6.4Ni8.7Cu10.5Al8 (Alloy A) were fabricated and characterized. The strengthening of in-situ alloys depends on the role of both the glassy matrix and the second phases. The glass transition and the crystallization kinetics were studied using DSC and X-ray diffraction as a function of element distribution. The amorphous and semi-crystalline structures were identified with the existence of nano crystals in the alloy nominal compositions. The Elastic compression modulus were found to increase with transition to crystallite phase. Where as, the microhardness decreases dramatically with the change from crystalline to amorphous phase. The compression fracture surface shows classic veins behavior. In mode of continuous heating and adiabatic annealing the glass transition, T g , and the crystalline peak, T p , temperatures display a strong dependency on heating rate. The activation energy for glass transition and crystallization were determined as E g  = 226 KJ/mol based on Kissinger method, but during the isothermal process E g  = 121 KJ/mol.

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Acknowledgments

The authors thank M. Frey, H. Grahl, M. Gründlich, C. Mickel and Sven for sample preparation, H.-J. Klauß for assistance with the mechanical tests, and A. Güth for stimulating discussions. Also, the DAAD Foundation and the IFW Dresden for providing financial support.

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Authors and Affiliations

  1. Department of Production and Mechanical Design, Faculty of Engineering at Port-Said, Suez Canal University, Port-Fouad, Port-Said, Egypt

    Medhat Awad El-Hadek

  2. Department of Metrology, Petroleum & Mining Engineering, Suez Canal University, Suez, Egypt

    Magdy Kassem

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  1. Medhat Awad El-Hadek
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Correspondence to Medhat Awad El-Hadek.

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El-Hadek, M.A., Kassem, M. Characterization of strengthened rapidly quenched Zr-based alloys. Int J Mech Mater Des 4, 279–289 (2008). https://doi.org/10.1007/s10999-008-9068-0

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