Hostname: page-component-6bf8c574d5-t27h7 Total loading time: 0 Render date: 2025-02-14T11:27:53.538Z Has data issue: false hasContentIssue false
  • English
  • Français

Composition Dependence of the Hardness of Laves Phases in the Fe-Nb and Co-Nb Systems

Published online by Cambridge University Press:  21 September 2018

S. Voß ,
F. Stein ,
M. Palm ,
D. Grüner ,
G. Kreiner ,
G. Frommeyer  and
D. Raabe
S. Voß
Affiliation:
Max-Planck-Institut für Eisenforschung, Max-Planck-Str. 1, D-40237 Düsseldorf, Germany
F. Stein
Affiliation:
Max-Planck-Institut für Eisenforschung, Max-Planck-Str. 1, D-40237 Düsseldorf, Germany
M. Palm
Affiliation:
Max-Planck-Institut für Eisenforschung, Max-Planck-Str. 1, D-40237 Düsseldorf, Germany
D. Grüner
Affiliation:
Max-Planck-Institut für Chemische Physik fester Stoffe, Nöthnitzer Str. 40, D-01187 Dresden, Germany now at Dept. of Physical, Inorganic and Structural Chemistry, Arrhenius Laboratory, Stockholm University, S-106 91 Stockholm, Sweden
G. Kreiner
Affiliation:
Max-Planck-Institut für Chemische Physik fester Stoffe, Nöthnitzer Str. 40, D-01187 Dresden, Germany
G. Frommeyer
Affiliation:
Max-Planck-Institut für Eisenforschung, Max-Planck-Str. 1, D-40237 Düsseldorf, Germany
D. Raabe
Affiliation:
Max-Planck-Institut für Eisenforschung, Max-Planck-Str. 1, D-40237 Düsseldorf, Germany
Get access

Abstract

Single-phase Fe-Nb and Co-Nb Laves phase alloys were produced by arc melting and levitation melting. By casting the levitation melted alloys in a preheated mould and subsequent slow cooling to room temperature, solid rods of 15 mm in diameter and about 100 mm length of the brittle Laves phases were obtained. Within the extended homogeneity ranges of the NbFe2 and NbCo2 Laves phases, the Vickers hardness was measured in dependence on composition. The results show that the hardness has a maximum at the stoichiometric composition in both systems, indicating defect softening. Nanoindentation measurements on a Co-Nb diffusion couple confirm the dependence of the hardness on composition. In addition, these measurements indicate that the crystal structure of the Laves phase polytype – cubic or hexagonal – seems to have no effect on the hardness. Indentation fracture toughness KIC-IF data for the different polytypes of the Laves phases were evaluated from the Palmquist cracks originating from the edges of the Vickers indentations.

Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1128: Symposium U – Advanced Intermetallic-Based Alloys for Extreme Environment and Energy Applications , 2008 , 1128-U08-05
Copyright
Copyright © Materials Research Society 2009

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

1. Paufler, P., Schulze, G.E.R., phys. stat. sol. 24, 77 (1967).Google Scholar
2. Machon, L., Sauthoff, G., Intermetallics 4, 469 (1996).Google Scholar
3. Kazantzis, A.V., Aindow, M., Jones, I.P., Triantafyllidis, G.K., De Hosson, J.Th.M., Acta Mater. 55, 1873 (2007).Google Scholar
4. Paufler, P., Eichler, K., Schulze, G.E.R., Monatsber.Dt.Akad.Wissensch. Berlin 12, 950 (1970).Google Scholar
5. Eichler, K., Siegel, S., Kubsch, H., Paufler, P., Wiss. Z. Techn. Univ. Dresden 20, 399 (1971).Google Scholar
6. Liu, C.T., Zhu, J.H., Brady, M.P., McKamey, C.G., Pike, L.M., Intermetallics 8, 1119 (2000).Google Scholar
7. Leitner, G., Doctoral thesis, TU Dresden 1971, pp. 129–131.Google Scholar
8. Grüner, D., Stein, F., Palm, M., Konrad, J., Ormeci, A., Schnelle, W., Grin, Y., Kreiner, G., Z. Kristallogr. 221, 319 (2006)Google Scholar
9. Kreiner, G., Grüner, D., Grin, Y., Stein, F., Palm, M., Ormeci, A., in these proceedingsGoogle Scholar
10. He, C., Stein, F., Palm, M., Raabe, D., in these proceedingsGoogle Scholar
11. Paul, E., Swartzendruber, L.J., Bull. Alloy Phase Diagr. 7, 248 (1986).Google Scholar
12. Grüner, D., Doctoral thesis, TU Dresden 2007, pp. 1–276; online available at http://nbnresolving.de/urn:nbn:de:swb:14-1172078219643-48967. Google Scholar
13. Niihara, K., J. Mater. Sci. Lett. 2, 221 (1983).Google Scholar
14. Shetty, D.K., Wright, I.G., J. Mater. Sci. Lett. 5, 365 (1986).Google Scholar
15. Song, Y.K., Varin, R.A., Intermetallics 6, 379 (1998).Google Scholar
16. von Keitz, A., Doctoral thesis, RWTH Aachen, Shaker Verlag Aachen 1996, pp. 1-139.Google Scholar
17. Pike, L.M., Chang, Y.A., Liu, C.T., Acta Mater. 45, 3709 (1997)Google Scholar