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Microstructural evolution of single Ni2TiAl or hierarchical NiAl/Ni2TiAl precipitates in Fe-Ni-Al-Cr-Ti ferritic alloys during thermal treatment for elevated-temperature applications

Song, Gian ; Sun, Zhiqian ; Poplawsky, Jonathan D ; Gao, Yanfei ; Liaw, Peter K

Acta Materialia, 01 April 2017, Vol.127, pp.1-16 [Tạp chí có phản biện]

ISSN: 1359-6454 ; E-ISSN: 1873-2453 ; DOI: 10.1016/j.actamat.2017.01.011

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  • Nhan đề:
    Microstructural evolution of single Ni2TiAl or hierarchical NiAl/Ni2TiAl precipitates in Fe-Ni-Al-Cr-Ti ferritic alloys during thermal treatment for elevated-temperature applications
  • Tác giả: Song, Gian ; Sun, Zhiqian ; Poplawsky, Jonathan D ; Gao, Yanfei ; Liaw, Peter K
  • Chủ đề: Ferritic Alloys ; Precipitation ; Transmission Electron Microscopy (Tem) ; Atom Probe Tomography (Apt) ; Engineering
  • Là 1 phần của: Acta Materialia, 01 April 2017, Vol.127, pp.1-16
  • Mô tả: Precipitate features, such as the size, morphology, and distribution, are important parameters determining the mechanical properties of semi- or fully-coherent precipitate-hardened alloys at elevated temperatures. In this study, the microstructural formation and evolution of recently-developed Fe-Ni-Al-Cr-Ti alloys with superior creep resistance have been systematically investigated using transmission-electron microscopy (TEM), scanning-electron microscopy (SEM), and atom-probe tomography (APT). These alloys were designed by adding 2 or 4 wt percent (wt. %) Ti into a NiAl-hardened ferritic alloy with a nominal composition of Fe-6.5Al-10Cr-10Ni-3.4Mo-0.25Zr-0.005B in wt. %. These alloys were, then, subjected to a homogenization treatment at 1473 K for 0.5 h, followed by aging treatments at 973 K for 1–500 h. In the homogenization-treated case, both alloys contain a primary L2 -type Ni TiAl precipitate, but with the distinct size and morphology...
  • Ngôn ngữ: English
  • Số nhận dạng: ISSN: 1359-6454 ; E-ISSN: 1873-2453 ; DOI: 10.1016/j.actamat.2017.01.011

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