Hostname: page-component-745bb68f8f-5r2nc Total loading time: 0 Render date: 2025-01-26T03:09:04.935Z Has data issue: false hasContentIssue false
  • English
  • Français

A Comparative Study on the Influence of Nb and Ti Additions to Different Processed Atomized Nial Powders.

Published online by Cambridge University Press:  26 February 2011

Rainhard Laag ,
Wolfgang A. Kaysser  and
GÜnter Petzow
Rainhard Laag
Affiliation:
Max-Planck-Institut für Metallforschung, Pulvermetallurgisches Laboratorium, Heisenbergstraβe 5, D-7000 Stuttgart 80, Germany.
Wolfgang A. Kaysser
Affiliation:
Max-Planck-Institut für Metallforschung, Pulvermetallurgisches Laboratorium, Heisenbergstraβe 5, D-7000 Stuttgart 80, Germany.
GÜnter Petzow
Affiliation:
Max-Planck-Institut für Metallforschung, Pulvermetallurgisches Laboratorium, Heisenbergstraβe 5, D-7000 Stuttgart 80, Germany.
Get access

Abstract

Prealloyed powders of NiAl, NiAl-5Ti, NiAl-5Nb and NiAl-5Ti-5Nb (at.%) were gas atomized with an average particle size of 90 μm and cooling rates of > 104 K/s. The powders were attritor milled under Ar atmosphere reducing the average particle size to 1.5 μm. Sintering CIP compacts developed microstructure and density distributions, which allowed subsequent containerless HIPing to near full density (>98.5%) and a final grain size < 8 μm. Alloying of NiAl with 5at.% Nb or Ti increased its hardness, Young's modulus, toughness and creep resistance. The room temperature fracture path changed from primarily intergranular (NiAl) to primarily transgranular (Nb, Ti alloyed), increasing the Klc, values from 3.8 to 14.4 and 15.3 MPa√m, respectively. For comparison, HIPed materials from the as-atomized powders were also tested.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 213: Symposium Q – High-Temperature Ordered Intermetallic Alloys IV , 1990 , 821
Copyright
Copyright © Materials Research Society 1991

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

LITERATURE

1. Vedula, K., Pathare, V., Aslandis, I. and Titran, R.H., in High Temperature Ordered Intermetallic Alloys I, edited by Koch, C.C., Liu, C.T. and Stoloff, N.S.; (Mater.Res.Soc. Proc. 39, Pittsburgh, PA 1985) pp. 411–421.Google Scholar
2. Sherman, M. and Vedula, K., J. Mater. Sci. 21, 1974 (1986).CrossRefGoogle Scholar
3. Pathare, V. and Vedula, K., Modern Developments in Powder Metallurgy 16, 695 (1984).Google Scholar
4. Schulson, E.M. and Barker, D.R., Script. Metall. 17, 519 (1983).CrossRefGoogle Scholar
5. Rigney, J.D., Khadkikar, P.S., Lewandowski, J.J. and Vedula, K., in High Temperature Ordered Intermetallic Alloys III, edited by Liu, C.T., Taub, A.I., Stoloff, N.S. and Koch, C.C.,; (Mater.Res.Soc. Proc. 133, Pittsburgh, PA 1989) pp. 603–608.Google Scholar
6. Laag, R., Kaysser, W.A., Galinski, G. and Maurer, R., in PM into the 1990's - International Conference on Powder Metallurgy London 1990; The Institute of Metals, London; 2, 278 (1990).Google Scholar
7. Maurer, R., Galinski, G., Laag, R. and Kaysser, W.A., in High Temperature Ordered Intermetallic Alloys III, edited by Liu, C.T., Taub, A.I., Stoloff, N.S. and Koch, C.C.,; (Mater.Res.Soc. Proc. 133, Pittsburgh, PA 1989) pp 421–426.Google Scholar
8. Ashby, M.F.; HIP-487: A Program for Constructing Hot Isostatic Pressing Diagrams, University of Cambridge, UK (1987.Google Scholar
9. Hancock, G.F. and McDonnell, B.R., Phys. Stat. Sol. (a) 4, 143 (1971).CrossRefGoogle Scholar