Diffusion research in HCP Mg–Al–Sn ternary alloys

An Effective Strategy to Maintain the CALPHAD Atomic Mobility Database of Multicomponent Systems and Its Application to Hcp Mg–Al–Zn–Sn Alloys

“…Figure 8 and Figure 9 also show the model-predicted composition–distance profiles of 10 diffusion couples (i.e., Mg/Mg-2.77Al-0.97Sn, Mg-1.46Sn/Mg-3.81Al, Mg-0.96Al-1.48Sn/Mg, and Mg-0.98Sn/Mg-1.92Al, annealed at 773 K for 6 h, in at.%; Mg-2.63Al-0.94Sn/Mg, Mg-1.43Sn/Mg-3.80Al, and Mg-1.89Al/Mg-0.97Sn, annealed at 723 K for 9 h, in at.%; Mg/Mg-1.43Al-0.92Sn, Mg-1.45Sn/Mg-3.74Al, and Mg-0.98Sn/Mg-1.83Al, annealed at 823 K for 3 h, in at.%) according to the present atomic mobilities and also those from Zhong et al [ 32 ] compared with the experimental data by Zhang et al [ 34 ]. As can be seen in Figure 6 , Figure 7 , Figure 8 and Figure 9 , the model-predicted composition–distance profiles according to the present work are in better agreement with the experimental data by Zhou et al [ 37 ] and Zhang et al [ 34 ] than the model-predicted ones due from Zhong et al [ 32 ], especially in the figures, i.e., Figure 6 a,b, Figure 7 a,b, Figure 8 b,d and Figure 9 b,c,e,f. Furthermore, the model-predicted diffusion paths at 673, 723, 773, and 823 K, based on the presently updated atomic mobilities and also those by Zhong et al [ 32 ], are displayed in Figure 10 compared with the experimental data from Zhou et al [ 37 ] and Zhang et al [ 34 ].…”

“…Figure 6 and Figure 7 display the model-predicted composition–distance profiles of eight diffusion couples (i.e., Mg-0.52Sn/Mg-7.81Al, Mg-1.00Sn/Mg-7.37Al, Mg-2.30Al-0.83Sn/Mg, and Mg-8.00Al-0.46Sn/Mg, annealed at 673 K for 216 h, in at.%; Mg-1.04Sn/Mg-3.59Al, Mg-1.07Sn/Mg-7.63Al, Mg/Mg-7.86Al-0.53Sn, and Mg-2.3Al-0.9Sn/Mg, annealed at 723 K for 216 h, in at.%) from the present work (solid lines) compared with the experimental data (in symbols) by Zhou et al [ 37 ]. The model-predicted results according to Zhong et al [ 32 ] (dashed lines) are also superimposed in the figure for direct comparison.…”

“…For the hcp Mg–Al–Sn ternary system, Zhou et al [ 37 ] determined the composition–distance profiles at 673 and 723 K based on the diffusion couple technique. Moreover, the composition–distance profiles for the Mg–Al–Sn ternary diffusion couples at 723, 773, and 823 K were determined by Zhang et al [ 34 ], respectively.…”

“…Moreover, the composition–distance profiles for the Mg–Al–Sn ternary diffusion couples at 723, 773, and 823 K were determined by Zhang et al [ 34 ], respectively. The experimental data from both Zhou et al [ 37 ] and Zhang et al [ 34 ] were employed in the present optimization.…”

“…Based on the experimental composition profiles in the hcp Mg–Al–Zn system by Kammerer et al [ 35 ], Wang et al [ 36 ] evaluated the main interdiffusion coefficients (i.e., and ) and cross-interdiffusion coefficients (i.e., and ) at common intersection points using the Whittle–Green (W–G) method [ 38 ]. For the hcp Mg–Al–Sn ternary system, the interdiffusion coefficients (i.e., , , , and ) at the intersection compositions along diffusion paths were determined by Zhou et al [ 37 ] also using the W–G method. Moreover, the inter-diffusivities of the hcp Mg–Al–Sn system were also determined by Zhang et al [ 34 ] by means of the M–K method.…”