Interdiffusion of Copper and Iron in Liquid Aluminum

Abstract

Liquid diffusion experiments determining the interdiffusion coefficients for Fe and Cu in liquid Al have shown that Fe diffuses 50-60% more slowly than does Cu. Results from the literature indicate that Ni also diffuses more slowly in liquid Al than does Cu but about 25% more quickly than Fe. It is also shown that the concentration dependence for the diffusion of Cu in liquid Al over the concentration range 0-45 at.% is small, only about 35% greater than the tracer diffusion coefficient. A novel and simplified technique for preparation of diffusion capillaries involving a solid wire that acts as both a plug for one end of the capillary and a source of solute is described.

Development of an atomic mobility database for liquid phase in multicomponent Al alloys: focusing on binary systems

“…Figure 9c presents the calculated and measured inter-diffusion coefficients at different temperatures between 963 and 1073 K. The calculated ones can well reproduce the experimental valuesfrom Lee and Cahoon [45]. Figure 10a presents the model-predicted concentration profile of the Al/Al-4.5 at.% Cu diffusion couple annealed at 983 Kfor 175 sand 1045 s. Figure 10b showsthe model-predicted concentration profile of the Al-21.3 at.%C u /Al diffusion couple annealed at 1053 Kf or 10 800 s. The profiles predicted by the present mobility database are in excellent accordance with the experimental data [44,45], which verifies the validity of the currently diffusivity database. Figure 11 showst he calculated and measured tracer diffusion coefficients of Si in Al-12.5 wt.% Si melt.…”

“…Usingtime-resolved X-ray radiography technique and the QNS method, Zhang et al [44] investigated the inter-diffusion coefficient in liquid Al 81.3 Cu 18.7 melta nd the tracerdiffusion coefficientsofCuinAl 80 Cu 20 meltrespectively. Lee and Cahoon [45] determined the inter-diffusion coefficients in the Al -Cumelts by means of the long capillary technique from 963 to 1053 K. Al inear extrapolation of the tracer diffusion coefficients of Cu to x Cu =0shows that the impuritydiffusion coefficients from Dahlborg et al [42] are about afactor of 4larger than the onesobtained by Du et al [4]. Thus their data are not used in the present assessment.…”

“…(a) Calculated concentration dependence of inter-diffusion coefficients in liquid Al -Cualloys at 983 K, and (b) Calculated inter-diffusion coefficients in Al-18.7 at.% Cu, compared with the experimental data[44]; (c) Calculated and measured inter-diffusion coefficients in Al -Cumelts at different temperatures between 963 and 1073 K[45].…”

A sliding cell technique for diffusion measurements in liquid metals

“…Similarly, the diffusion data reported in Ref. 26 and measured using the finite column method are also believed to be disturbed by convection. To further examine the diffusion data, using roughly the same composition for comparison, Fig.…”

“…Figure 8 presents the measured diffusion data in Al-Cu melts as a function of composition from the present and previous work. 1,12,26 In Ref. 12, the diffusion data were measured with 1.0-mm or 1.5-mmdiameter capillaries.…”