Secondary ion mass spectrometry was used to measure diffusion coefficients in single crystals of W at 2115 to 2470K (table 92). The isotope effect was studied for 50Cr and 54Cr, and was found to be equal to 0.18.

S.M.Klotsman, S.V.Osetrov, I.P.Polikarpova, G.N.Tatarinova, A.N.Timofeyev, O.P.Shepatkovskiy: Fizika Metallov i Metallovedenie, 1987, 64[1], 148-61. [Physics of Metals and Metallography, 1987, 64[1], 133-46])

 

Table 91

Diffusion of Various Solutes in Ti60Ni40

Solute

Temperature (K)

D (m2/s)

B

604

5.2 x 10-21

B

690

7.3 x 10-19

Be

604

8.5 x 10-22

Be

690

1.5 x 10-19

Fe

604

8.3 x 10-20

Fe

690

2.0 x 10-21

Si

604

1.4 x 10-23

Si

690

4.0 x 10-21

 

 

 

 

Table 92

Diffusion of Cr in W

Temperature (K)

D (cm2/s)

2195

8.33 x 10-14

2249

1.64 x 10-13

2428

1.48 x 10-12

2461

2.62 x 10-12