An experimental study was made of Ni diffusion, in single-grained samples of an icosahedral quasicrystalline compound, at 699 to 1074K. A radiotracer technique, together with serial sectioning, was used to determine the concentration versus depth profiles. No deviation from Arrhenius behaviour was detected over the present temperature range, and the results (table 61, figure 7) could be described by:
D (m2/s) = 5.3 x 10-3 exp[-209(kJ/mol)/RT]
The most interesting observation was that Ni diffusion, and the diffusion of other transition-metal elements, was much slower than the diffusion of elements such as Ge and Zn. The activation enthalpies for the diffusion of transition-metal elements were also considerably greater than those found for non-transition metal elements. It was concluded that the diffusion of Ni atoms was most likely to proceed via a vacancy mechanism over Al and Pd sites.
T.Zumkley, H.Nakajima, T.A.Lograsso: Philosophical Magazine A, 2000, 80[5], 1065-74. See also: Materials Science and Engineering A, 2001, 294-296, 702-5
Table 49
Interdiffusion Coefficients in Al-Based Systems at 813K
System | Interdiffusion Coefficient | Magnitude (m2/s) |
Al-Cu | DCuCu | 1.33 x 10-13 |
Al-Mg | DMgMg | 4.22 x 10-13 |
Al-Ag | DAgAg | 2.73 x 10-13 |
Al-Cu-Mg | DCuCu | 1.55 x 10-13 |
Al-Cu-Mg | DMgMg | 4.39 x 10-13 |
continued
Table 49 (continued)
Interdiffusion Coefficients in Al-Based Systems at 813K
System | Interdiffusion Coefficient | Magnitude (m2/s) |
Al-Cu-Mg | DCuMg | 1.80 x 10-14 |
Al-Cu-Mg | DMgCu | 3.50 x 10-14 |
Al-Cu-Mg-Ag | DCuCu | 2.94 x 10-13 |
Al-Cu-Mg-Ag | DMgMg | 4.17 x 10-13 |
Al-Cu-Mg-Ag | DAgAg | 3.40 x 10-13 |
Al-Cu-Mg-Ag | DCuMg | 1.20 x 10-14 |
Al-Cu-Mg-Ag | DMgCu | 5.50 x 10-14 |
Al-Cu-Mg-Ag | DMgAg | 5.00 x 10-16 |
Al-Cu-Mg-Ag | DAgMg | 5.60 x 10-14 |
Table 50
Diffusion Parameters for the Al-Cu-Mg System
Pressure (MPa) | Do (m2/s) | ECuCu (kJ/mol) |
0.101 | 4.2 x 10-5 | 132 |
1000 | 1.9 x 10-5 | 137 |
2000 | 9.0 x 10-6 | 143 |
3000 | 5.0 x 10-6 | 149 |
Table 51
Diffusion Parameters for the Al-Cu-Mg System
Pressure (MPa) | Do (m2/s) | EMgMg (kJ/mol) |
0.101 | 6.9 x 10-5 | 128 |
1000 | 4.9 x 10-5 | 136 |
2000 | 3.4 x 10-5 | 144 |
3000 | 2.4 x 10-5 | 152 |
Table 52
Diffusion Parameters for the Al-Cu-Mg System
Pressure(MPa) | Do (m2/s) | EMg(Al-Cu)(kJ/mol) |
0.101 | 2.1 x 10-5 | 120 |
1000 | 2.7 x 10-5 | 133 |
2000 | 3.5 x 10-5 | 144 |
3000 | 4.4 x 10-5 | 157 |
Table 53
Interdiffusion Coefficients in the Al-Cu-Zn System
as a Function of Temperature and Pressure
Pressure (MPa) | Temperature (K) | DCuCuAl (m2/s) |
0.101 | 815 | 1.4 x 10-13 |
0.101 | 830 | 2.0 x 10-13 |
0.101 | 845 | 2.8 x 10-13 |
0.101 | 860 | 4.0 x 10-13 |
2000 | 815 | 6.6 x 10-15 |
2000 | 830 | 9.6 x 10-15 |
2000 | 845 | 1.4 x 10-14 |
2000 | 860 | 2.0 x 10-14 |
2800 | 815 | 2.0 x 10-15 |
2800 | 830 | 3.1 x 10-15 |
2800 | 845 | 4.1 x 10-15 |
2800 | 860 | 6.7 x 10-15 |
Table 54
Interdiffusion Coefficients in the Al-Cu-Zn System
as a Function of Temperature and Pressure
Pressure (MPa) | Temperature (K) | DZnCuAl (m2/s) |
0.101 | 815 | -8.0 x 10-14 |
0.101 | 830 | -7.6 x 10-15 |
0.101 | 845 | -2.5 x 10-13 |
0.101 | 860 | 5.6 x 10-13 |
2000 | 815 | -9.8 x 10-16 |
2000 | 830 | 1.2 x 10-14 |
2000 | 845 | 1.3 x 10-14 |
2000 | 860 | -1.4 x 10-14 |
2800 | 815 | -3.2 x 10-15 |
2800 | 830 | 8.6 x 10-15 |
2800 | 845 | -2.8 x 10-15 |
2800 | 860 | -7.5 x 10-15 |
Table 55
Interdiffusion Coefficients in the Al-Cu-Zn System
as a Function of Temperature and Pressure
Pressure (MPa) | Temperature (K) | DCuZnAl (m2/s) |
0.101 | 815 | -3.6 x 10-15 |
0.101 | 830 | -2.1 x 10-15 |
0.101 | 845 | 6.8 x 10-15 |
0.101 | 860 | -5.2 x 10-15 |
2000 | 815 | 1.3 x 10-16 |
2000 | 830 | 1.7 x 10-15 |
2000 | 845 | -2.0 x 10-15 |
2000 | 860 | -2.7 x 10-15 |
2800 | 815 | -1.7 x 10-17 |
2800 | 830 | 2.4 x 10-16 |
2800 | 845 | -5.7 x 10-16 |
2800 | 860 | -1.6 x 10-16 |
Table 56
Interdiffusion Coefficients in the Al-Cu-Zn System
as a Function of Temperature and Pressure
Pressure (MPa) | Temperature (K) | DZnZnAl (m2/s) |
0.101 | 815 | 4.2 x 10-13 |
0.101 | 830 | 5.9 x 10-13 |
0.101 | 845 | 7.6 x 10-13 |
0.101 | 860 | 1.2 x 10-12 |
2000 | 815 | 2.5 x 10-14 |
2000 | 830 | 3.5 x 10-14 |
2000 | 845 | 5.0 x 10-14 |
2000 | 860 | 7.5 x 10-14 |
2800 | 815 | 7.7 x 10-15 |
2800 | 830 | 1.2 x 10-14 |
2800 | 845 | 1.4 x 10-14 |
2800 | 860 | 2.7 x 10-14 |
Figure 6
Diffusivity of 60Co in Al72.2Ni11.8Co16.0
(Filled circles: parallel to c-direction, Open circles: perpendicular to c-direction)
Table 57
Interdiffusion in Al3Fe
Temperature (C) | D (cm2/s) |
900 | 2.8 x 10-9 |
950 | 9.2 x 10-9 |
1000 | 1.9 x 10-8 |
1050 | 5.1 x 10-8 |
Table 58
Effective Diffusivity in Al-Li Alloys
Temperature (C) | Li (at%) | D (m2/s) |
150 | 7.6 | 8.02 x 10-21 |
150 | 9.8 | 6.04 x 10-21 |
170 | 7.6 | 2.07 x 10-20 |
170 | 9.8 | 1.81 x 10-20 |
Table 59
Diffusivity of 60Co in Al72.2Ni11.8Co16.0 (Tenfold Direction)
Temperature (K) | Diffusivity (m2/s) |
803 | 1.64 x 10-19 |
870 | 3.55 x 10-18 |
923 | 2.73 x 10-17 |
971 | 1.82 x 10-16 |
993 | 3.61 x 10-16 |
1021 | 1.05 x 10-15 |
1079 | 5.50 x 10-15 |
1144 | 3.20 x 10-14 |
1210 | 1.55 x 10-13 |
Table 60
Diffusivity of 60Co in Al72.2Ni11.8Co16.0 (Twofold Direction)
Temperature (K) | Diffusivity (m2/s) |
803 | 5.60 x 10-20 |
876 | 2.40 x 10-18 |
923 | 1.90 x 10-17 |
971 | 1.03 x 10-16 |
997 | 2.42 x 10-16 |
1025 | 7.50 x 10-16 |
1079 | 4.41 x 10-15 |
1144 | 2.69 x 10-14 |
1210 | 1.47 x 10-13 |
Table 61
Diffusivity of 63Ni in Al70Pd21Mn9
Temperature (K) | D (m2/s) |
699 | 6.96 x 10-19 |
774 | 3.04 x 10-17 |
870 | 1.68 x 10-15 |
960 | 2.34 x 10-14 |
1012 | 7.96 x 10-14 |
1074 | 3.63 x 10-13 |
Figure 7
Diffusivity of 63Ni in Al70Pd21Mn9