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11 results

  • Multi-scale and multimodal x-ray microscopy and applications

  • Xianghui Xiao
  • Journal:
    Microscopy and Microanalysis / Volume 27 / Issue S1 / August 2021
    Published online by Cambridge University Press:
    30 July 2021, p. 378
    Print publication:
    August 2021
    • Article
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  • 3D morphological evolution of porous titanium by x-ray micro- and nano-tomography

  • Yu-chen Karen Chen-Wiegart, Takeshi Wada, Nikita Butakov, Xianghui Xiao, Francesco De Carlo, Hidemi Kato, Jun Wang, David C. Dunand, Eric Maire
  • Journal:
    Journal of Materials Research / Volume 28 / Issue 17 / 14 September 2013
    Published online by Cambridge University Press:
    14 June 2013, pp. 2444-2452
    Print publication:
    14 September 2013

  • The 3D morphological evolution of titanium foams as they undergo a two-step fabrication process is quantitatively characterized through x-ray micro- and nano-tomography. In the first process step, a Cu–Ti–Cr–Zr prealloy is immersed in liquid Mg, where Cu is alloyed with Mg while a skeleton of crystalline Ti–Cr–Zr is created. In the second step, the Mg–Cu phase is etched in acid, leaving a Ti–Cr–Zr foam with submicron struts. 3D images of these solidified Ti–Cr–Zr/Mg–Cu composites and leached Ti–Cr–Zr foams are acquired after 5, 10, and 30 min exposure to liquid Mg. As the Mg exposure time increases, the Ti–Cr–Zr ligaments grow in size. The tortuosity loosely follows the Bruggeman relation. The interfacial surface distribution of these Ti-foams is qualitatively similar to other nano-porous metal prepared by one-step dealloying. The characteristic length of the Mg–Cu phase and pores are also reported.