Abstract:The creep behavior of a {［（Fe0.6Co0.4）0.75B0.2Si0.05］0.96Nb0.04}96Cr4 bulk amorphous alloy and effects of different loading rates on its creep deformation behavior were investigated using nanoindentation technique at room temperature. It is found that the creep deformation of this alloy is strongly dependent on the indentation loading rate: when the loading rate ranges from 3 to 24 mN/s, distinct creep deformation occurs; but when the loading rate decreases to 1 mN/s or 0.75 mN/s, the creep deformation is comp… Show more
“…Figure 6 illustrates the observation of pile-ups of the amorphous coatings heat-treated at 150°C (a) and 250°C (b) caused by shear band expansion with atomic force microscopy (AFM) at peak load of 10 mN with holding time of 30 s. It can be concluded that indentation creep may lead to the formation and expansion of multiple shear regions around the material, which may lead to the material softening [21]. Figure 6 The creep indentation profile of the amorphous coatings heat-treated at 150°C (a) and 250°C (b) with the same holding time (30 s) and the same peak load (10mN).…”
In this study, Fe-based amorphous coatings were fabricated on 304 stainless steel by highvelocity oxyfuel (HVOF). Moreover, the properties of Fe-based amorphous coatings heattreated at 150°C and 250°C were investigated. The XRD analysis shows that the structure of heat-treated amorphous coatings is all amorphous, and the porosity of heat-treated amorphous coatings is lower than that of original amorphous coatings. With the heat-treated temperature increasing, the corrosion resistance of amorphous coatings is improved in artificial seawater. Compared with the original coatings, the heat-treated amorphous coatings have great creep resistance. The wear resistance of heat-treated amorphous coatings is excellent than original amorphous coatings in artificial seawater and dry friction condition. The experiment results point out that the heat-treated amorphous coatings have excellent properties, which can improve properties of Fe-based amorphous coatings.
“…Figure 6 illustrates the observation of pile-ups of the amorphous coatings heat-treated at 150°C (a) and 250°C (b) caused by shear band expansion with atomic force microscopy (AFM) at peak load of 10 mN with holding time of 30 s. It can be concluded that indentation creep may lead to the formation and expansion of multiple shear regions around the material, which may lead to the material softening [21]. Figure 6 The creep indentation profile of the amorphous coatings heat-treated at 150°C (a) and 250°C (b) with the same holding time (30 s) and the same peak load (10mN).…”
In this study, Fe-based amorphous coatings were fabricated on 304 stainless steel by highvelocity oxyfuel (HVOF). Moreover, the properties of Fe-based amorphous coatings heattreated at 150°C and 250°C were investigated. The XRD analysis shows that the structure of heat-treated amorphous coatings is all amorphous, and the porosity of heat-treated amorphous coatings is lower than that of original amorphous coatings. With the heat-treated temperature increasing, the corrosion resistance of amorphous coatings is improved in artificial seawater. Compared with the original coatings, the heat-treated amorphous coatings have great creep resistance. The wear resistance of heat-treated amorphous coatings is excellent than original amorphous coatings in artificial seawater and dry friction condition. The experiment results point out that the heat-treated amorphous coatings have excellent properties, which can improve properties of Fe-based amorphous coatings.
The TiN, TiAlN and TiAlSiN coatings were deposited on H13 hot-worked mold steel by cathodic arc ion plating (CAIP). The morphologies, phase compositions, and nanoindentation parameters, such as creep hardness, elastic modulus and plastic deformation energy of the coatings were analyzed with field emission scanning electron microscopy (FESEM), X-ray diffraction (XRD) and nanoindentation testing, respectively, and the test results were compared with equation describing the indentation model. The results show that the TiN, TiAlN and TiAlSiN coating surfaces were dense and composed of TiN, TiN + TiAlN, TiN + Si 3 N 4 + TiAlN phases, respectively. There was no spalling or cracking on the indentation surface. The creep hardness of the TiN, TiAlN and TiAlSiN coatings was 7.33, 13.5, and 15.2 GPa, respectively; the corresponding hardness measured by nanoindentation was 7.09, 15.6, and 21.7 GPa, respectively; and the corresponding elastic modulus was 201.93, 172.79, and 162.77 GPa, respectively. The contact depth and elastic modulus calculated by the indentation model were close to those of the test results, but the remaining indentation parameters showed discrepancies. The sequence of plastic deformation energy was TiN > TiAlN>TiAlSiN.
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