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Microstructure of sample with 10 at.% aluminum additions, showing precipitates covering the full surface, qualitative microanalyses shown the chemical composition in both zones.
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Context 1
... composition of the observed precipitates is basically copper in major proportion with less nickel amount as can be observed in Figure 3. Figure 3 shows the microstructure of sample with 10 at.% ...
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... composition of the observed precipitates is basically copper in major proportion with less nickel amount as can be observed in Figure 3. Figure 3 shows the microstructure of sample with 10 at.% Al, where it is observed an α-phase dendritic morphology with eutectic structure in Cu-Ni matrix. ...
Context 3
... composition of the observed precipitates is basically copper in major proportion with less nickel amount as can be observed in Figure 3. Figure 3 shows the microstructure of sample with 10 at.% ...
Context 4
... composition of the observed precipitates is basically copper in major proportion with less nickel amount as can be observed in Figure 3. Figure 3 shows the microstructure of sample with 10 at.% Al, where it is observed an α-phase dendritic morphology with eutectic structure in Cu-Ni matrix. ...
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Citations
... It is crucial to assess the hardness of the material in order to understand the likely underlying wear process, since material hardness is often correlated to wear resistance [23]. Table 2 lists the averaged microhardness values for the A1 and A2 alloys at room temperature (RT) and 300 • C (acquired after the sliding wear tests and outside the wear tracks). ...
In this study, processing–structure–property relations were systematically investigated at room and elevated temperatures for two FCC Al0.3CoFeCrNi and Al0.3CuFeCrNi2 high-entropy alloys (HEAs), also known as complex concentrated alloys (CCAs), prepared by conventional arc-melting. It was determined that both alloys exhibit FCC single-phase solid solution structure. Micro-indentation and sliding wear tests were performed to study the hardness and tribological behavior and mechanisms at room and elevated temperatures. During room-temperature sliding, both alloys exhibit similar friction behavior, with an average steady-state coefficient of friction (COF) of ~0.8. Upon increasing sliding temperatures to 300 °C, the average COF decreased to a lowest value of ~0.3 for Al0.3CuFeCrNi2. Mechanistic wear studies showed this was due to the low interfacial shear strength tribofilms formed inside the wear tracks. Raman spectroscopy and energy dispersive spectroscopy determined the tribofilms were predominantly composed of binary oxides and multi-element solid solution oxides. While the tribofilms at elevated temperatures lowered the COF values, the respective wear rates in both alloys were higher compared to room-temperature sliding, due to thermal softening during 300 °C sliding. Thus, these single FCC-phase HEAs provide no further benefit in wear resistance at elevated temperatures, and likely will have similar implications for other single FCC-phase HEAs.
