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Nanostructure of vortex during explosion welding.

V V Rybin1, B A Greenberg, M A Ivanov

  • 1CRISM Prometey, St. Petersburg 191015, Russia.

Journal of Nanoscience and Nanotechnology
|March 10, 2012
PubMed
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Explosion welding of titanium aluminide with titanium creates a multilayered joint. Microstructural analysis reveals a transition zone with vortices, likely formed by local melting and turbulent transport.

Area of Science:

  • Materials Science
  • Metallurgy
  • Welding Engineering

Background:

  • Bimetallic joints are crucial in advanced engineering applications.
  • Explosion welding is a solid-state joining process used for dissimilar materials.
  • Understanding the microstructure of titanium aluminide/titanium joints is key to optimizing performance.

Purpose of the Study:

  • To investigate the microstructure of an explosion-welded joint between orthorhombic titanium aluminide and commercially pure titanium.
  • To identify and characterize the distinct zones and features within the bimetallic joint.
  • To elucidate the formation mechanisms of observed microstructural elements, particularly vortices.

Main Methods:

  • Microstructural analysis of the bimetallic joint.

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  • Characterization of the interface and surrounding zones.
  • Identification of structural features such as deformation zones, recrystallized areas, and transition zones.
  • Analysis of vortex formation and material transport mechanisms.

    • Main Results:

    • The welded joint exhibits a multilayered structure: a severely deformed zone, a recrystallized titanium zone, and a transition zone.
    • The transition zone features a wavy interface, lattice macrorotations, and vortices.
    • Vortices are likely formed by local melting and turbulent transport, evidenced by dipoles and ultrafine duplex structures.
    • Fragmentation plays a role in lattice rotations and particle transfer between materials.

    Conclusions:

    • Explosion welding of titanium aluminide and titanium results in a complex microstructure with distinct zones.
    • Local melting and turbulent transport are proposed mechanisms for vortex formation in the transition zone.
    • Fragmentation significantly influences the microstructural evolution and material mixing within the joint.