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8 results

  • Femtosecond TEM: Imaging Nanoscale Materials Dynamics at Temporal Extremes
  • David Flannigan, Ryan Gnabasik, Yichao Zhang
  • Journal: Microscopy and Microanalysis / Volume 26 / Issue S2 / August 2020
  • Published online by Cambridge University Press: 30 July 2020, pp. 1126-1127
  • Print publication: August 2020
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  • Strain Patterning via Spontaneous Centroidal Voronoi Tessellation in Few-Layer MoS2
  • Yichao Zhang, David Flannigan
  • Journal: Microscopy and Microanalysis / Volume 26 / Issue S2 / August 2020
  • Published online by Cambridge University Press: 30 July 2020, pp. 2368-2370
  • Print publication: August 2020
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  • Direct Imaging of Localized Anisotropic Acoustic-Phonon Dynamics in MoS2
  • Yichao Zhang, David J. Flannigan
  • Journal: Microscopy and Microanalysis / Volume 25 / Issue S2 / August 2019
  • Published online by Cambridge University Press: 05 August 2019, pp. 2128-2129
  • Print publication: August 2019
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  • Spatially-Resolved Strain-Wave Dynamics in MoS2
  • Yichao Zhang, Alyssa J. McKenna, David J. Flannigan
  • Journal: Microscopy and Microanalysis / Volume 24 / Issue S1 / August 2018
  • Published online by Cambridge University Press: 01 August 2018, pp. 1898-1899
  • Print publication: August 2018
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  • Investigations on carburizing mechanisms of Cr35Ni45Nb subjected to different service conditions in a high-temperature vacuum environment
  • Yichao Peng, Maicang Zhang, Jiangchu Xiao, Jianxin Dong, Chenyang Du
  • Journal: Journal of Materials Research / Volume 30 / Issue 6 / 28 March 2015
  • Published online by Cambridge University Press: 20 March 2015, pp. 841-851
  • Print publication: 28 March 2015
  • View abstract

    The carburizing behaviors and mechanisms for Cr35Ni45Nb alloy subjected to different service conditions were studied in a high-temperature vacuum environment. Generally, the carburizing process of an alloy is always accompanied by diffusional heterogeneous reactions regardless of the service condition of the alloy. For a carburized original tube, there is a layered structure at the inner wall of the tube, which is comprised of a M7C3 zone, a M7C3–M23C6 mixed zone, and a M23C6 zone with different morphologies. However, for a 6-year tube (short for a tube serviced for 6 years), the composite oxide layers formed previously act as effective barriers to carbon infiltration. Moreover, the Cr2O3 scale tended to be carbonized to form carbide scale to spall from the surface in a reducing environment, while the SiO2 kept stable all along. Once the oxide layers were removed or carbonized enough, inconceivable internal carburization occurred widely.