Hf Diffusion

The results (table 19) showed that the diffusion rate of Hf in Ni was greater than that in Ni3Al although the solubility of Hf in Ni was smaller than that in Ni3Al.Diffusion Behaviour of Hafnium in Ni and Ni3Al. Shuwei, M., Yunrong, Z.: Journal of Materials Science Letters, 1997, 16[21], 1761-3

Table 19

Diffusion of Hf in Ni3Al at various temperatures

Temperature (C)	D(m2/s)
1120	1.0 x 10-11
1100	1.5 x 10-12
1050	1.6 x 10-13

Figure 17

Hydrogen permeation flux in Ni75.9Al20.5Fe3.5B0.1

Curves, from top to bottom, for 75, 120 and 160µm