Effect of Wetting Agent and Carbide Volume Fraction on the Wear Response of Aluminum Matrix Composites Reinforced by WC Nanoparticles and Aluminide Particles

Lekatou, A.; Gkikas, N.; Karantzalis, A. E.; Kaptay, George; Gácsi, Zoltán; Baumli, Péter; Simon, Andrea

doi:10.1515/amm-2017-0184

Cited by 10 publications

(16 citation statements)

References 29 publications

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“…In order to explain the variety of the morphological features characterizing the microstructure, the works of El‐Mahallawy and Lekatou et al should be addressed. According to these research efforts, a series of potential reactions‐thermal transformations may take place:

At 83 0^{°} normalC : {3K}_{2} {TiF}_{6} ((), s) + 13 Al ((), l) \to {3Al}_{3} Ti ((), s) + {3KAlF}_{4} ((), l) + K_{3} {AlF}_{6} ((), l),

19 Al ((), l) + 3WC \to {3Al}_{5} normalW + {Al}_{4} C_{3},

16 Al ((), l) + 3WC \to {3Al}_{4} normalW + {Al}_{4} C_{3},

On cooling ((), 69 7^{°} normalC) : Al ((), l) + {Al}_{5} normalW \to {Al}_{12} normalW ((), peritectic),

On cooling ((), 66 1^{°} normalC) : Al ((), l) + {Al}_{12} normalW \to Al ((), s) ((), peritectic) .

Figure presents the X‐ray diffractrograms of the 0.5 and 2.0 vol% composite systems (a lower and a higher particle additions) as examples of the various phases formed adopted by a previous work of the same research team, which are met, however, in all the different composites produced in the present effort. Both intermetallic (in situ) and WC carbide (ex situ) reinforcing phases can be recognized.…”

Section: Resultsmentioning

confidence: 99%

“…It is also important to notice the presence of eutectic microconstiutents of Al‐Fe and Al‐Fe‐Si nature located at the Al grain boundaries. Lekatou et al have commented in details on their formation.…”

Section: Resultsmentioning

confidence: 99%

“…On cooling 661°C Figure 2 presents the X-ray diffractrograms of the 0.5 and 2.0 vol% composite systems (a lower and a higher particle additions) as examples of the various phases formed adopted by a previous work of the same research team, 43 which are met, however, in all the different composites produced in the present effort. Both intermetallic (in situ) and WC carbide (ex situ) reinforcing phases can be recognized.…”

Section: Microstructurementioning

confidence: 88%

“…In order to explain the variety of the morphological features characterizing the microstructure, the works of El-Mahallawy 41 and Lekatou et al 42,43 should be addressed. According to these research efforts, a series of potential reactions-thermal transformations may take place:…”

Section: Microstructurementioning

confidence: 99%

“…42,44 It is also important to notice the presence of eutectic microconstiutents of Al-Fe and Al-Fe-Si nature located at the Al grain boundaries. Lekatou et al 42,43 have commented in details on their formation. In order to support further the results of the XRD analysis, Figure 3 shows the results of the SEM-EDX examination of the various precipitates formed in the 2.5 vol% reinforced composite, which are also, nevertheless, met in the other systems as well.…”

Section: Microstructurementioning

confidence: 99%

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Sliding wear and solid particle erosion response of aluminium reinforced with tungsten carbide nanoparticles and aluminide particles

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In the present effort, aluminium matrix composites (AMCs) were produced by the addition of submicron‐sized WC particles of low (up to 2.5 vol%) content into a melt of Al1050. Casting was assisted by the use of K2TiF6 as a wetting agent and mechanical stirring in order to limit particle clustering. Particle distribution was reasonably uniform comprising both clusters and isolated particles. Various different reinforcing particles' phases were identified, both in situ (Al‐W, Al‐Ti, and Al‐W‐Ti intermetallic phases) and ex situ (WC particles) of various morphologies shapes and sizes. Increase of the reinforcing particle content led to an increase of the tendency for clustering. The wear properties of the composite were examined by dry sliding wear. The worn surfaces and the produced debris were examined by SEM‐EDX, and an effort to correlate the wear response of the produced materials with the matrix and the reinforcing phase characteristics was attempted. In general, the increase of the reinforcing phase content led to an improvement of the sliding wear response. Solid particle erosion experiments were carried out for impact angles of 30°, 60°, and 90°. Τhe eroded surfaces were examined with SEM‐EDX, and possible erosion mechanisms were proposed based on morphological and other material characteristics. Intensive particle clustering seemed to deteriorate the erosion resistance of the systems. Medium concentrations of the reinforcing particles (1.0‐1.5 vol% WC) are proposed as a recipe for optimum sliding wear and solid particle erosion resistance behavior.

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