Investigator: RNDr. Jiří Čermák, DSc.
Number of Project: 106/99/1179
Agency: Czech Science Foundation
Duration: 01. 01. 1999 - 31. 12. 2001

The subject of the proposal is the study of migration characteristics of hydrogen in fourteen Ni3A1-based alloys in dependence on temperature chosen from interval 650-1200 K and on concentration of the third alloying element M (M=B,Cr,Fe and Zr). The measurements of hydrogen permeability will be carried out with mono-phase alloys by permeation technique. The proposed issue is at the top of interest of many scientific teams in recent years, since the H-induced brittlenes of Ni3Al, and of intermetalliin general, is the crucial obstacle on the way to much wider application of intermetallics into the technical practice. The new experimental results obtained in present project will shed some light into the kinetics of brittle-to-ductile transformation.

J. Čermák, V. Rothová and I. Stloukal: Hydrogen Permeation in CMSX-4 and in Its Structural Components. International Congress on Advanced Materials and Applications Materials Week 2000, Munich 25-28 Sept 2000.

J. Čermák, V. Rothová and I. Stloukal: Volumetric Measurement of Hydrogen Permeation in Certain Ni-Al-based Alloys. Def. Dif. For. 194-197, 2001, 1075. (Presented as poster on DIMAT 2000, 5^th International Conference on Diffusion in Materials, July 17-21, 2000, Paris, France)

J. Čermák and V. Rothová: Influence of Cr Upon Hydrogen Permeation in Ni₃Al at Low Partial Pressure of Oxygen, Intermetallics 9, 2001, 245.

J. Čermák and V. Rothová: Surface Barrier for Hydrogen Permeability in Ni₃Al – Influence of Cr, Fe and Zr. Intermetallics 9, 2001, 403.

J. Čermák, J. Růžičková, M. Konečný and H. Ipser: Short-Circuit Diffusion of Nickel in the Intermetallic Compound Ni₃Ga. Scripta Mater. 43, 2000, 232.

V. Rothová, I. Stloukal and J. Čermák: Permeation of Hydrogen in Ni-based superalloy CMSX-4. Acta Mater. 48, 2000, 827.