The Th/Sc–Zr/Sc plot (figure 9) can distinguish between evolved and juvenile sediment sources and the extent of sorting and recycling experienced by sediments (Taylor and McLennan 1985; McLennan et al. 1990), thus distinguishing the effects of source composition and sedimentary process on the basis of assumption that quartz …
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The analysis of major and trace elements (i.e., La/Th–Hf, Th/Sc–Zr/Sc, La/Y–Zr/Sc, TiO 2 –Fe 2 O 3 T + MgO, Al 2 O 3 /SiO 2 –Fe 2 O 3 T + MgO) indicates that their sedimentary sources were felsic rocks from an active continental margin or a continental arc containing a minor amount of recycled sediments derived from a passive ...
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Mg, Zr, Li, Sc and Ti atoms do not improve the stability of the Al alloys. The Gibbs free . energies of the Al 3 M phase s varied with temperature in the following order: Al 3 Yb < Al 3 Lu
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VDOMDHTMLTYPE html> Intermetallic Growth and Interfacial Properties of the Grain Refiners in Al Alloys - PMC The new PMC design is here! Learn moreabout navigating …
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Sc and Zr provide the formation of a high density core-shell L1 2-strucured Al 3 (Sc,Zr) dispersoids [39,40,41]. These dispersoids result in strong Zener pining effect and inhibit grain growth, and, in addition, increase tensile properties at room temperature [42,43,44,45,46,47,48].
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The alloy with addition of Sc + Zr after SPD and thermal treatment consisted of finer (Sc 1 – x Zr x)Al 3 particles which were more densely distributed in the matrix in comparison with ZrAl 3; they inhibited growth of the grains with the sizes of ~12 μm in comparison with ~20 μm in the alloy with only Zr. Correspondingly, the microhardness ...
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Additionally, Sc-doped Al/Al₃(Zr, Sc) interfacial properties show that Sc can effectively improve the Al/Al₃(Zr, Sc) binding strength with the Al matrix. By combining the characteristics of ...
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The recrystallization and intergranular corrosion behaviors impacted by the additions of Sc and Zr in Al-Zn-Mg-Cu alloys are investigated. The stronger effect of coherent Al 3 (Sc 1−x Zr x) phases on pinning dislocation resulted in a lower degree of recrystallization in Al-Zn-Mg-Cu-Sc-Zr alloy, while the subgrain boundaries can escape …
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Figure 6(a–c) present the quality index Q for experimental comprehensive mechanical property and the predicted results after 3 iterations for the optimal Sc-modified hypoeutectic Al-Si-Mg alloys (the solidified features and the training results of A357-xSc, A360-xSc, and A380-xSc can be seen in Supplementary Figures S2 and S3). It should …
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The plots of TiO 2 vs. Fe 2 O 3 +MgO, Th/Sc vs. Sc and La–Th–Sc showed sediment composition intermediate between granite and basalt, while the plots of TiO 2 vs. Zr, Th vs. Sc and V–Ni–Th indicate intermediate provenance between mafic and felsic sources. The mineralogy of the sediments indicates mixed sources, but their chemical ...
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V W, V Zr, and V Sc2O3 are the volume fractions of W, Zr, and Sc 2 O 3, respectively, whereas C PW, C PZr, and C PSc2O3 are the specific heat values of W, Zr, and Sc 2 O 3, respectively.The data of C PW, C PZr, and C PSc2O3 at different temperatures were obtained from ref. 36.. The deuterium inventory in the samples was …
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The trace element data for heavy fraction when plotted in Th/Sc vs. Zr/Sc diagram (figure 10), indicates that Kaimur Group sandstone has suffered zircon sorting and sediment recycling. Zr content in sandstones from Mangesar Formation shows 592 and 8010 ppm in heavy fractions from lower and upper horizons (table 4). Mangesar …
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Sc and Zr can form Al 3 (Sc,Zr) particles in aluminum alloys, and it nucleates before α-Al, so Al 3 (Sc,Zr) particles can be used as nucleation sites. According to the results reported by Haidemenopoulos et al. [ 57 ] and Wang et al. [ 36 ], Al 3 (Zr, Sc) was preferentially precipitated in the supersaturated melt of Al-Mg-Sc-Zr alloy.
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The addition of Zr or Er to Al–Sc alloys respectively results in improvements in coarsening or creep resistance. In Al–Sc–Zr alloys, the coherent Al 3 Sc (L1 2) nanoprecipitates, which form during the early stages of aging serve as heterogeneous sites for precipitation of Zr, resulting in the formation of coherent core-shell Al 3 (Sc,Zr) (L1 2) …
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Contribute to yeahliangyy/ru development by creating an account on GitHub.
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Article 01 October 2018 Prediction of Structure and Phase Transformations Chapter © 2016 Introduction
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The possibility of producing the weldless complex-shape constructions, which would be difficult or even impossible to produce by other ways, is the main benefit of the superplastic-forming technology (SPF) [1,2,3,4,5,6].Xing et al. [] noted that the curved parts and complex shapes in automotive and aerospace sectors, small-scale structural, and …
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Al-8Zn-2Mg-1.5Cu-0.15Sc-0.15Zr alloy with high-strength performance as well as good castability has been developed. In this study, effects of electromagnetic stirring melt treatment (ESMT) on microstructure and mechanical properties of the alloy in the squeeze casting process were investigated. The results show that solidification structure and …
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Plots of La/Sc vs. Co/Th (a), Sc/Th vs. Co/Th (b), and Zr/Sc vs. Th/Sc (c) of river inlet sediments from the Four Rivers to Dongting Lake. Full size image. The contents of MgO, CaO, Na 2 O, and Sr in the XR and ZR sediments are distinctly lower than those in the YR and LR sediments. This may be attributed to the chemical weathering of granites ...
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The Al 3 (Zr,Er) precipitation behavior and property evolution in an ultra-fine grained (UFG) Al-0.4Fe-0.15Zr-0.25Er alloy processed by high pressure torsion (HPT) were investigated. It was found that the Al 3 (Zr,Er) dispersoids with core–shell structure were formed at much lower temperature of 150 °C as compared with that in coarse-grained …
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This study aimed to explore the effects of trace amounts of Mn, Zr, and Sc on the recrystallization behavior and corrosion resistance of Al-5Mg alloys after process annealing by means of alloy design and microstructure analysis of electron backscatter diffraction (EBSD), electron microprobe (EPMA), and electron microscopes (TEM and …
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Element Zirconium (Zr), Group 4, Atomic Number 40, d-block, Mass 91.224. Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images.
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The addition of the Zr element had a significant influence on the relative density of the W–Zr/Sc 2 O 3 composites that were all higher than 95%, particularly the …
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Effect of Er additions on ambient and high-temperature strength of precipitation-strengthened Al-Zr-Sc-Si alloys. C. Booth-Morrison D. Seidman D. Dunand. Engineering, Materials Science. 2012; 141. PDF. Save. Effects of La addition on the mechanical properties and thermal-resistant properties of Al–Mg–Si–Zr alloys based on …
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The grain size of the Al-Mg-Mn-Zr-Sc-Y alloy was 45 μm. Al3Mg2, Al3Y and ternary AlMgY phases were formed in the as cast condition. High hardening effect in 64HV was obtained after rolling.
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Here we investigate composition, structure and diffusion phenomena of ordered precipitates that form during heat treatment in an industrially cast Al–Mg–Sc–Zr …
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First Online: 09 February 2023 1834 Accesses 1 Citations Part of the The Minerals, Metals & Materials Series book series (MMMS) Abstract We studied the effect of zirconium and …
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It reported that adding Zr can inhibit precipitates coarsening, which enhances the thermal stability of the grains, i.e., suppressing recrystallization and refining grain (Ref 9). Sun et al. demonstrated that the combination of Sc and Zr elements can produce further synergistic effect on inhibiting recrystallization and refining grain (Ref 10 ...
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Early experiments showed that the advent of extensive grain growth may be delayed to ∼600 K by adding Zr to the Al–Mg alloy19,20 or to ∼700 K through the addition of Sc.21 Furthermore, very recent experiments on an Al–Mg–Sc–Zr alloy demonstrated excellent microstructural stability up to a temperature of ∼800 K.22 This suggests ...
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The size distribution and structural evolution of the precipitates are critical to the mechanical properties of heat treatable alloys. In Al alloys, many studies have reported that monodisperse core–shell Al 3 Li/Al 3 (Zr, Sc) structures in a Li-rich environment promote formation of δ′-Al 3 Li, T 1-Al 2 CuLi, and θ′-Al 2 Cu precipitates. However, …
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Active sediments along a 90 km section of Greater Zab River (GZR) in Kurdistan Region/ Iraq were analyzed for their major, trace, and rare earth elements contents to investigate their provenance, weathering at the source area, and tectonic setting. The enrichment of sediments with transition elements (Co, Cr, and Ni), the bivariate …
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The atomic radii of Zr and Sc are 2.16 Å and 2.09 Å, therefore, Sc can replace the Zr atom by diffusion without causing a change in the crystal structure of the Al 3 Zr …
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The microstructure and tensile properties of hot-extruded Al-8Zn-2Mg-2Cu-0.15Zr alloy (7055 alloy) with the minor addition of Sc were investigated. The 0.1 and 0.2 wt.% Sc were added into 7055 alloy during the preparation process by conventional casting. Attributing to the Sc additions, the grain sizes of as-cast ingots were remarkably refined …
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The alloying of aluminum alloys with Zr and Sc ensures the increase in the temperature of the start of recrystallization and an increase in the strength characteristics [1–3] due to the precipitation of nanosized Al 3 Zr/Al 3 Sc phase dispersoids with the L1 2 structure during heat treatment [4, 5].To increase the strength characteristics of the …
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Rutile from deposits hosted in lower to middle greenschist facies country rocks has low concentrations of Zr, Sc, U, and Hf and high concentrations of Ca, Sr, Ba, Th, Y, and REE compared with those from lower to middle amphibolite facies country rocks that have high concentrations of Zr, Sc, U, and Hf and low concentrations of Ca, Sr, Ba, Th, Y ...
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Nanocrystalline (NC) structure can lead to the considerable strengthening of metals and alloys. Obtaining appropriate comprehensive mechanical properties is always the goal of metallic materials. Here, a nanostructured Al-Zn-Mg-Cu-Zr-Sc alloy was successfully processed by high-pressure torsion (HPT) followed by natural aging. The …
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This is the first study presenting major and trace elemental data from the Mesoproterozoic Hongshuizhuang Formation shales in Yanshan basin, North China, in order to reconstruct its provenance and chemical weathering history. The shales are strongly depleted in Na2O and Sr and enriched in Y and transition metal elements relative to …
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This paper presents an overview of high strength Al alloys development including metallic additives, such as Zr, Sc, Mn, Cu, etc., and nanoparticle additives, such as ceramics (TiB 2, TiC, LaB 6 and TiN) as well as carbon nanotubes (CNTs). The addition of Zr and Sc elements significantly prevents hot tearing and enhances the strength of laser ...
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Microstructures for the Al-Mg-Fe-Ni-Zr-Sc alloy studied before the start of the superplastic deformation at 500 • C; (a) SEM image (b) SEM-EDS element distribution maps for the alloying elements ...
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Precipitation behavior of Al 3 (Sc,Zr) particles in a new high-alloyed Al–Zn–Mg–Cu–Zr–Sc aluminum alloy during homogenization was investigated by use of three-dimensional atom probe, transition electron microscope and high-resolution transition electron microscope. The results indicate that Al 3 Sc was the precursor of Al 3 (Sc,Zr) …
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