期刊
SCIENTIFIC REPORTS
卷 5, 期 -, 页码 -出版社
NATURE RESEARCH
DOI: 10.1038/srep16327
关键词
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资金
- Department of Energy (DOE), Office of Fossil Energy Program [DE-09NT0008089, DE-FE0005868, DE-FE-0011194, DE-FE-0024054]
- Office of Basic Energy Sciences (DOE)
- Los Alamos National Security LLC under the DOE [DE-AC52-06NA-25396]
- Center for Nanophase Materials Sciences (CNMS) at the Oak Ridge National Laboratory (ORNL)
- Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. Department of Energy
- US Department of Energy, Basic Energy Sciences, Materials Sciences and Engineering Division
There have been numerous efforts to develop creep-resistant materials strengthened by incoherent particles at high temperatures and stresses in response to future energy needs for steam turbines in thermal-power plants. However, the microstructural instability of the incoherent-particle-strengthened ferritic steels limits their application to temperatures below 900 K. Here, we report a novel ferritic alloy with the excellent creep resistance enhanced by coherent hierarchical precipitates, using the integrated experimental (transmission-electron microscopy/scanning-transmission-electron microscopy, in-situ neutron diffraction, and atom-probe tomography) and theoretical (crystalplasticity finite-element modeling) approaches. This alloy is strengthened by nano-scaled L2(1)-Ni2TiAl (Heusler phase)-based precipitates, which themselves contain coherent nano-scaled B2 zones. These coherent hierarchical precipitates are uniformly distributed within the Fe matrix. Our hierarchical structure material exhibits the superior creep resistance at 973 K in terms of the minimal creep rate, which is four orders of magnitude lower than that of conventional ferritic steels. These results provide a new alloy-design strategy using the novel concept of hierarchical precipitates and the fundamental science for developing creep-resistant ferritic alloys. The present research will broaden the applications of ferritic alloys to higher temperatures.
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