Influence of Sintering Temperature on Microhardness and Tribological Properties of Equi-Atomic Ti-Al- Mo-Si-W Multicomponent Alloy
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Abstract This work aim to investigate the effect of sintering temperature on microhardness and tribological properties of novel equi-atomic TiAlMoSiW HEA fabricated via spark plasma sintering. The influence of Spark plasma sintering temperature on morphological evolution and phase formation was also investigated. The microstructure and the phases formed for the developed HEA were examined using scanning electron microscopy (SEM) and X-ray diffractometry (XRD) respectively. The microhardness and tribological properties were studied using a diamond base microhardness tester Rtec tribometer. It was noticed that sintering temperature has an effect on microhardness and tribological properties. Phase analysis of the samples displayed that the alloy exhibited a bcc matrix with secondary phase precipitate of ordered fcc TiSi 2 phase. The developed HEA showed improved mechanical properties as the sintering temperature increases.Keywords:
Spark Plasma Sintering
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The understanding of the physical mechanisms involved in sliding contact disc - pads requires an experimental simulation represented by the couple disc-pin, taking into consideration a number of parameters such as the nature of the material of the disc and the pin, the applied normal load, the sliding speed, the contact area and the environment. The objective of this study consists to realize an experimental simulation model of the couple disc - pads in order to understand the evolution of the thermal and tribological behaviour. The experimental results obtained by means of the tribometer SRV4 show that the normal load has a significant effect on the tribological behaviour of the brake materials. The wear rate varies according to the materials and the essay conditions. The humidity has no influence on the variation of the friction temperature. According to the carried tests, the chromium steel 100Cr6 is characterized by a friction coefficient and temperatures higher than the cast iron FG25. DOI: http://dx.doi.org/10.5755/j01.mech.20.4.6974
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Even today, there is no full understanding of the relationship between the physical, chemical, and mechanical properties and the behavior of the lubricating films formed in tribological systems. Most of the published scientific research measures and reports the overall values of friction and wear, but the information given via statistical signals in the tribological tests is, in general, dismissed, leaving a hole in the study of the dynamics of tribological systems. In this work, an experimental study of statistical friction data, coating characteristics, and tribological performance is carried out using a pin-on-disk tribometer to test some metallic samples coated with lubricant films under several experimental conditions. The results indicate that long deposition times at high deposition temperatures of coatings from engine oil develop low-friction intervals, which fall until 20% of the uncoated coefficient friction. However, an unexpected and unfavorable behavior of the coatings was observed for the short deposition times and high temperature. In these conditions, the developed friction profiles reached a maximum level of friction that was 20% more than the uncoated coefficient friction. Moreover, it was found that the proper analysis and interpretation of the statistical data, in combination with the characterization of the coatings, describes the dynamics of the interactions between the bodies in contact and reveals the transitions of the surfaces with non-homogeneous properties throughout their depth.
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