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In Situ Synchrotron X-Ray Diffraction and Small Angle X-Ray Scattering Studies on Rapidly Heated and Cooled Ti-Al and Al-Cu-Mg Alloys Using Laser-Based Heating

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Abstract

Beam-based additive manufacturing (AM) typically involves high cooling rates in a range of 103–104 K/s. Therefore, new techniques are required to understand the non-equilibrium evolution of materials at appropriate time scales. Most technical alloys have not been optimized for such rapid solidification, and microstructural, phase, and elemental solubility behavior can be very different. In this work, the combination of complementary in situ synchrotron micro-x-ray diffraction (microXRD) and small angle x-ray scattering (SAXS) studies with laser-based heating and rapid cooling is presented as an approach to study alloy behavior under processing conditions similar to AM techniques. In rapidly solidified Ti-48Al, the full solidification and phase transformation sequences are observed using microXRD with high temporal resolution. The high cooling rates are achieved by fast heat extraction. Further, the temperature- and cooling rate-dependent precipitation of sub-nanometer clusters in an Al-Cu-Mg alloy can be studied by SAXS. The sensitivity of SAXS on the length scales of the newly formed phases allows their size and fraction to be determined. These techniques are unique tools to help provide a deeper understanding of underlying alloy behavior and its influence on resulting microstructures and properties after AM. Their availability to materials scientists is crucial for both in-depth investigations of novel alloys and also future production of high-quality parts using AM.

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Acknowledgements

The authors thank the Paul Scherrer Institut for providing beamtime at the cSAXS and microXAS beamlines of the Swiss Light Source. They also thank the TOMCAT beamline at the Swiss Light Source for providing the laser system.

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Authors and Affiliations

  1. Empa - Swiss Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, 8600, Dübendorf, Switzerland

    C. Kenel & C. Leinenbach

  2. Swiss Light Source, Paul Scherrer Institut, 5232, Villigen Psi, Switzerland

    P. Schloth, S. Van Petegem, J. L. Fife, D. Grolimund, A. Menzel & H. Van Swygenhoven

  3. École Polytechnique Fédérale de Lausanne, STI-IMX-LSMX, 1015, Lausanne, Switzerland

    P. Schloth

  4. École Polytechnique Fédérale de Lausanne, STI-IMX-NXMM, 1015, Lausanne, Switzerland

    H. Van Swygenhoven

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  1. C. Kenel
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  3. S. Van Petegem
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  4. J. L. Fife
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  5. D. Grolimund
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  6. A. Menzel
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  7. H. Van Swygenhoven
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  8. C. Leinenbach
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Correspondence to C. Leinenbach.

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Kenel, C., Schloth, P., Van Petegem, S. et al. In Situ Synchrotron X-Ray Diffraction and Small Angle X-Ray Scattering Studies on Rapidly Heated and Cooled Ti-Al and Al-Cu-Mg Alloys Using Laser-Based Heating. JOM 68, 978–984 (2016). https://doi.org/10.1007/s11837-015-1774-0

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  • DOI: https://doi.org/10.1007/s11837-015-1774-0

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