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    Design and Fabrication of Functionally Graded Material from Ti to γ-TiAl by Laser Metal Deposition

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    2017-13-Chen.pdf (1.356Mb)
    Date
    2017
    Author
    Chen, Xueyang
    Yan, Lei
    Newkirk, Joe
    Liou, Frank
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    Abstract
    Functionally graded material (FGM) is one kind of advanced material characterized by a gradual change in properties as the position varies. The spatial variation of compositional and microstructure over volume is aimed to control corresponding functional properties. In this research, when 100% γ-TiAl was directly deposited on pure Ti substrate, cracks were formed within the γ-TiAl layer. Then a six-layer crack-free functionally graded material of Ti/TiAl was designed and fabricated by laser metal deposition (LMD) method, with composition changing from pure Ti on one side to 100% γ-TiAl on the other side. The fabricated FGM was characterized for material properties by a variety of techniques. The chemical compositions, microstructure, phases, and hardness of the composite were characterized by Scanning Electronic Microscope (SEM), Optical Microscope (OM), Energy Dispersive X-ray Spectroscopy (EDS), and hardness testing. The microstructure and chemical compositions in different layers were studied.
    Department
    Mechanical Engineering
    Subject
    functionally graded material
    laser metal deposition
    crack-free
    titanium
    γ-TiAl
    TiAl
    URI
    https://hdl.handle.net/2152/89807
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    • 2017 International Solid Freeform Fabrication Symposium

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    © The University of Texas at Austin