With all the calculated isothermal section of the Mg-Zn-Al technique at particular temperatures, to additional verify the phase relations around intermetallic compounds. Figure 3b shows the diffusion path of the diffusion couple Mg-Al20Zn determined at 360 C in prior analysis [20], exactly where the diffusion Fulvestrant Protocol profile moves across the hcp-Mg, , , and single-phase region in sequence. According to [20], Zn was found in all 3 IMC layers of , , and , and its content material increased discontinuously towards the Al-Zn substrate. The average composition with the thickest layer formed adjacent to the Al-Zn side from the diffusion couple was Al45 Mg40 Zn15 , that is further verified by TEM characterization to become the -(Al, Zn)49 Mg32 phase. The -Al3 Mg2 phase usually seen in Al-Mg binary systems was replaced by phase in this diffusion, indicating that high Zn content material is often enough to modify the diffusion path to completely suppress the formation on the undesirable phase. The addition of Zn can drastically retard the thickening rate of the -Al12 Mg17 phase, though it really is weak at inhibiting the thickening price on the overall IMC reaction layer in an Al-Mg diffusion couple. It might be additional noted from the diffusion path that just after getting into the single-phase region from phase, the content of Zn increases clearly from five Zn to 8 Zn just before getting into the phase region, which is in very good agreement with the present maximum solid solubility of 7.7 Zn determined type the alloy sample four, as shown in Table 1. Figure 6 shows the EPMA and SEM benefits of the MgZn2 -Al3 Mg2 diffusion couples made use of in this study after annealing at 410 C for 4 h, where the composition profile corresponding to the metallographic structure could be detected in detail. Figure 6a presents the EPMA outcomes of a series of points chosen on a line perpendicular for the phase interface along the diffusion direction, where the two interlayers of and phase could be detected. In Figure 6b, layers on the intermetallic compounds phase can be conveniently observed among MgZn2 and Al3 Mg2 , even though phase is difficult to distinguish with out noticing the composition jump amongst and Al3 Mg2 phase, as shown in Figure 6a. Comparing the two figures, it might be noticed that the thickness of phase is greater than that of phase, indicating a faster elemental diffusion AB928 GPCR/G Protein within the phase. This situation agrees well together with the experimental detection by Wang et al. [20]. It can be further noticed that the composition profiles within phase and phase exhibit clear nonlinear distributions, implying that the diffusivities of your components are strongly composition-dependent. The composition profile in Figure 6a is further plotted in the isothermal section of the Mg-Zn-Al technique computed at 410 C to detect the diffusion path, as shown in Figure 3c. It could be seen that phase lies amongst and Al3 Mg2 phase, exhibiting a wide strong solubility range of Zn. The maximum homogeneity content of Zn in phase is 8.5 on the diffusion path, which is equivalent to the measured value of your existing alloy sample 4 in Table 1. By comparing sample four with sample 1, the increment of Zn content material from 3.9 to 7.7 results in a clear reduce in Al content material from 53.18 to 41.38 , indicating the Zn atoms dissolved in phase preferred to occupy the websites in the Al atoms. This result is consistent with the prior experimental findings by Wang et al. [20]. Nevertheless, the diffusion path with the experimental data within this study deviates in the calculated single phase area to exhibit a larger Mg con.
