The bulk diffusivity of Cu in the superalloy was studied at temperatures of between 1050 and 1500K by using the serial sectioning technique. It was found that the results (table 78) could be described by:

D (m2/s) = 5.02 x 10-5exp[-269.05(kJ/mol)/RT]

Grain boundary diffusion of the tracer in small-grained samples was studied at temperatures of between 760 and 1170K. It was found that the results could be described by:

D (m2/s) = 3.35 x 10-5exp[-170.80(kJ/mol)/RT]

A.R.Paul, M.C.Naik, K.N.G.Kaimal: Physica Status Solidi A, 1991, 128[1], 9-19

 

 

 

Table 78

Bulk Diffusion of Cu in Incoloy 800

 

Temperature (K)

D (m2/s)

1050

1.73 x 10-18

1100

9.22 x 10-18

1150

4.77 x 10-17

1200

1.09 x 10-16

1250

2.54 x 10-16

1300

6.53 x 10-16

1360

2.28 x 10-15

1430

5.86 x 10-15

1500

2.33 x 10-14