The deformed microstructures of Ti-48.9at%Ni thin films were investigated by using transmission electron microscopy. It was found that Guinier-Preston zones existed in the films and that the martensite contained (001) compound twins as a sub-structure. The microstructure of the martensite showed that the Guinier-Preston zones did not stop the shear deformation of the martensitic transformation or the twinning shear of (001) deformation twins in the martensite phase. This explained previous results in which Ti-
rich Ti-Ni thin films containing Guinier-Preston zones had exhibited large transformation strains in spite of the presence of the zones.
Influence of Guinier-Preston Zones on Deformation in Ti-Rich Ti-Ni Thin Films. J.X.Zhang, M.Sato, A.Ishida: Philosophical Magazine Letters, 2002, 82[5], 257-64
Table 5
Diffusivity of B in Zr41Be27.8Ti8.7Cu12.5Ni10
Temperature (K) | Diffusivity (m2/s) |
513 | 1.40 x 10-23 |
533 | 6.10 x 10-23 |
551 | 4.56 x 10-22 |
555 | 6.71 x 10-22 |
573 | 1.83 x 10-21 |
585 | 5.73 x 10-21 |
612 | 3.38 x 10-20 |
628 | 1.07 x 10-19 |
642 | 4.05 x 10-19 |
651 | 6.94 x 10-19 |
657 | 6.92 x 10-19 |