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Anton Paar’s Hit 300 is a nanoindentation tester built for ease of use and reliability. It provides accurate measurements and possesses a modular and durable design. ....
In this study, magnetic arc oscillation (MAO) at three different frequencies (5 Hz, 10 Hz and 20 Hz) was applied during deposition of a Ni-base alloy, Hastelloy C276, by wire arc additive manufacturing (WAAM). The microstructure, surface finish and the mechanical properties of WAAM deposited Hastelloy C276 alloy samples with MAO were investigated and compared with the counterpart without the application of MAO. On-line monitoring of the arc movement and molten pool morphologies showed that the incorporation of MAO during WAAM may reduce the arc density during deposition, leading to a decrease in the solidification time. This, in turn, improved the surface accuracy of the as-built alloys. Furthermore, through the application of MAO, the dendrites exhibited a higher variety of growth orientations, and reduced dendrite arm spacings (DAS). The MAO at 5 Hz appeared to enhance the mechanical properties of the produced alloy, while the application at the higher frequencies of 10 Hz and 20 Hz ....
Dual phase high-entropy alloys formed by eutectic transformation from the melt (EHEAs), tend to possess a greater balance in strength and ductility as compared to those of conventional single-phase FCC, BCC or HCP HEAs manufactured from similar elements. Properties, including corrosion resistance and good softening-resistance under high-temperature conditions, make them potential candidates for challenging industrial applications. However, few insights on tribological properties of EHEAs at high temperatures are currently available. Our study explored the friction and wear behavior of AlCoCrFeNi EHEA against Si N by reciprocating pin-on-disc testing, over a wide range of temperature (500–900 °C). High-temperature oxidation behavior was thoroughly examined and found to have a definite influence on wear mechanism of AlCoCrFeNi . For temperatures in the range 500–600 °C, the friction coefficient is roughly at 0.4 and abrasion is dominating wear mechanism. Above 700 °C, there is a ....