Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Effect of chromium content on microstructure and mechanical properties of large dimensional bulk nanocrystalline based Fe–Al–Cr alloys prepared by aluminothermic reaction
Highlights ► We prepared large dimensional bulk nanocrystalline alloy, ∅200mm×10mm. ► Grain size varied in range of 15–18nm with Cr content. ► Cr7C3 phase appears in nanocrystalline matrix and varied with Cr content. ► Compressive strength was 1.2GPa, much higher than those of small dimensional alloys.
Abstract Large dimensional bulk nanocrystalline based Fe–Al–Cr alloys with 5, 10 and 15wt.% Cr which were about 200mm in diameter and 10mm in thickness was prepared by an aluminothermic reaction casting method. Microstructures of the alloys were investigated by scanning electron microscope (SEM) attached with energy dispersive spectrometer (EDS) and electron backscattered diffraction (EBSD), X-ray diffraction (XRD) and transmission electron microscope (TEM). Compressive properties of the alloys were tested. The results show that the alloys were consisted of a Fe–Al–Cr nanocrystalline matrix with the grain size in a range of 15–18nm and a precipitated Cr7C3 phase which dispersed homogeneously in the matrix. The content of Cr dissolved in the nanocrystalline matrix, volume fraction and morphology of the Cr7C3 phase varied with the increasing of Cr element added in the alloys. Compressive strength of the alloys was in a range of 1100–1200MPa. The alloy with 10wt.% Cr had the highest yield strength of about 1048MPa, while the alloy with 15wt.% Cr had the lowest yield strength of about 911MPa. The alloys showed considerable ductility and best plastic deformation capability for that of 15wt.% Cr.
Effect of chromium content on microstructure and mechanical properties of large dimensional bulk nanocrystalline based Fe–Al–Cr alloys prepared by aluminothermic reaction
Highlights ► We prepared large dimensional bulk nanocrystalline alloy, ∅200mm×10mm. ► Grain size varied in range of 15–18nm with Cr content. ► Cr7C3 phase appears in nanocrystalline matrix and varied with Cr content. ► Compressive strength was 1.2GPa, much higher than those of small dimensional alloys.
Abstract Large dimensional bulk nanocrystalline based Fe–Al–Cr alloys with 5, 10 and 15wt.% Cr which were about 200mm in diameter and 10mm in thickness was prepared by an aluminothermic reaction casting method. Microstructures of the alloys were investigated by scanning electron microscope (SEM) attached with energy dispersive spectrometer (EDS) and electron backscattered diffraction (EBSD), X-ray diffraction (XRD) and transmission electron microscope (TEM). Compressive properties of the alloys were tested. The results show that the alloys were consisted of a Fe–Al–Cr nanocrystalline matrix with the grain size in a range of 15–18nm and a precipitated Cr7C3 phase which dispersed homogeneously in the matrix. The content of Cr dissolved in the nanocrystalline matrix, volume fraction and morphology of the Cr7C3 phase varied with the increasing of Cr element added in the alloys. Compressive strength of the alloys was in a range of 1100–1200MPa. The alloy with 10wt.% Cr had the highest yield strength of about 1048MPa, while the alloy with 15wt.% Cr had the lowest yield strength of about 911MPa. The alloys showed considerable ductility and best plastic deformation capability for that of 15wt.% Cr.
Effect of chromium content on microstructure and mechanical properties of large dimensional bulk nanocrystalline based Fe–Al–Cr alloys prepared by aluminothermic reaction
Wang, Hongding (Autor:in) / La, Peiqing (Autor:in) / Liu, Xuemei (Autor:in) / Wei, Yupeng (Autor:in) / Jiao, Huisheng (Autor:in)
12.12.2012
8 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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