Abstract:Many nonferrous metals, including aluminum, nickel, copper, and others, are among the few materials that do not degrade or lose their chemical or physical properties in the recycling process. As a result, these metals can be recycled an infinite number of times. This article focuses on the recycling of nonferrous alloys, namely, aluminum, copper, magnesium, tin, lead, zinc, and titanium, providing details on the sources, consumption and classification of scrap, and the technological trends and developments in … Show more
“…In the other hand the modal analysis provided different data. The validating values were around the specific Young's moduli which can be found in the literature [36]. In case of the MMSFs a relatively small deviation was found.…”
The effective Young's modulus of aluminium matrix syntactic foams was determined by modal analysis. Two different matrix materials (Al99.5 and AlSi12) were used, and they were reinforced by Globocer grade ceramic hollow spheres. In order to validate the results, a full-scale finite element model was also created. A new algorithm was developed to place the spheres in a proper, probabilistic spatial distribution. Finite element simulations were carried out in modal analysis and compression test senses. In addition, three different analytical methods were studied to estimate the effective Young's modulus. The measured values were compared with the finite element and analytical results. The determined effective Young's moduli showed good agreement. This paper is part of a thematic issue on Light Alloys.
“…In the other hand the modal analysis provided different data. The validating values were around the specific Young's moduli which can be found in the literature [36]. In case of the MMSFs a relatively small deviation was found.…”
The effective Young's modulus of aluminium matrix syntactic foams was determined by modal analysis. Two different matrix materials (Al99.5 and AlSi12) were used, and they were reinforced by Globocer grade ceramic hollow spheres. In order to validate the results, a full-scale finite element model was also created. A new algorithm was developed to place the spheres in a proper, probabilistic spatial distribution. Finite element simulations were carried out in modal analysis and compression test senses. In addition, three different analytical methods were studied to estimate the effective Young's modulus. The measured values were compared with the finite element and analytical results. The determined effective Young's moduli showed good agreement. This paper is part of a thematic issue on Light Alloys.
“…Figure 5 shows the compressive specific strength vs. the plastic strain of as-cast Alx HEAs and previously reported Nb-Ti-V-X-Y HEAs. Obviously, the as-cast Alx ( x = 0.1–0.5) HEAs with suitable ductility have a very high specific strength, superior to Ti-6Al-4V, Inconel 718 alloy, and previously reported Nb-Ti-V-X-Y HEAs, and even more than two times of commercial Mg alloys [29-35]. The combination of high specific strength and suitable ductility can be attributed to the solid-solution strengthening of Al and the precipitation strengthening of second phase [36].…”
Section: Resultsmentioning
confidence: 99%
“… Figure 5 Specific strength vs. plastic strain of a series of Nb-Ti-V-X-Y HEAs, commercial Mg alloys, Ti-6Al-4V, and Inconel 718 alloys. The data for HEAs [8,29-31] were obtained in compression, and commercial Mg alloys [32,33], Ti-6Al-4V [34], and Inconel 718 [35] alloys were obtained in tensile tests.…”
The effect of continuously varying aluminium with a low content ( x = 0.1–0.5) on as-cast AlxNbTiVZr high entropy alloys (HEAs) was studied. AlxNbTiVZr ( x = 0.1, 0.2) HEAs showed a single BCC phase, while some lamellar second phases precipitated along the grain boundaries in AlxNbTiVZr ( x = 0.3, 0.4, 0.5) alloys. With the increase in Al percentage, the compressive strength of AlxNbTiVZr HEAs increased from 1452 to 1667 MPa, whereas their ductility decreased from 19.40 to 6.15%. Notably, the AlxNbTiVZr HEAs showed both a higher specific yielding strength and considerable plastic strain than other Nb-Ti-V-X-Y HEAs and commercial Mg-, Ti-, and Ni-based alloys. Finally, the fracture morphologies of AlxNbTiVZr ( x = 0.1–0.2) HEAs showed some features of compression ductility.
“…1. Based on the phase diagram of Mg-Al binary system, the microstructure of as-cast alloys consisted of α-Mg matrix, reticular eutectic structure [α(Mg)+β(Mg 17 Al 12 )] [2] , as seen in Fig. 1(a).…”
Section: Resultsmentioning
confidence: 99%
“…According to the heterogeneous nucleation method reported by Turnbull [2] , nucleating agents improve the nucleation of melt as follows: (1) there has high melting point phase in alloy which could provide the surface for heterogeneous nucleation on melt surface; (2) some Low-Index Faces of high melting point phase and basal metal have small mismatch. Surface energy and nucleation energy should be little, thus the under-cooling degree required for nucleation decreased, the grain will be refined.…”
The effects of Gd on microstructure of AZ71 magnesium alloy were studied by optical microscope, SEM and X-ray diffraction analyzer. The results show that the alloy mainly contained α-Mg matrix, eutectic α (Mg)+β (Mg17Al12) phase and Al2Gd phase. The microstructure of alloy was refined and homogeneous by Gd. The volume fraction of β phase is decreased with the addition of Gd, and the β-phase are congregated and coarsened with the excessive Gd.
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