Hostname: page-component-848d4c4894-ttngx Total loading time: 0 Render date: 2024-05-03T17:19:15.338Z Has data issue: false hasContentIssue false
  • English
  • Français

Novel Hollow Powder Porous Structures

Published online by Cambridge University Press:  10 February 2011

David J. Sypeck ,
Phillip A. Parrish  and
Haydn N.G. Wadley
David J. Sypeck
Affiliation:
University of Virginia, School of Engineering and Applied Science, Department of Materials Science and Engineering, Charlottesville, VA 22903
Phillip A. Parrish
Affiliation:
University of Virginia, School of Engineering and Applied Science, Department of Materials Science and Engineering, Charlottesville, VA 22903
Haydn N.G. Wadley
Affiliation:
University of Virginia, School of Engineering and Applied Science, Department of Materials Science and Engineering, Charlottesville, VA 22903
Get access

Abstract

Recent finite element calculations [1] indicate that structures constructed from partially compacted hollow spheres exhibit a greater stiffness and strength than many other cellular structures at comparable density. It has been observed that gas atomization of metallic powders often leads to entrapment of the flow field gas [2]. The resulting hollow powders are an unwanted by-product in the sense that they lead to porosity and future sites of defect in solid parts. Here a method is developed to separate the hollow powders according to their size, shape and density. They are then consolidated to a porous structure. Examples of this are given for both a titanium alloy and a nickel-base superalloy. The compressive mechanical properties are measured and compared to those of other porous structures.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 521: Symposium R – Porous & Cellular Materials for Structural Applications , 1998 , 205
Copyright
Copyright © Materials Research Society 1998

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

REFERENCES

1. Grenestedt, J.L., Int. J. Solids Structures, in press (1998).Google Scholar
2. Rabin, B.H., Smolik, G.R. and Korth, G.E., Mat. Sci. and Eng. A124, 1 (1990).Google Scholar
3. Norris, B. and Gojny, F.J., U.S. Patent No. 4,925,740 (15 May 1990).Google Scholar
4. Bart-Smith, H., Bastawros, A.-F., Mumm, D.R., Evans, A.G., Sypeck, D.J. and Wadley, H.N.G., Acta mater., in press (1998).Google Scholar
5. Beggs, J.M., Wang, T.G. and Elleman, D.D., U.S. Patent No. 4,344,787 (17 Aug 1982).Google Scholar
6. Baxter, N., Uslu, C., Lee, K.J., Sanders, T.H. and Cochran, J.K., in Synthesis/Processing of Light Weight Metallic Materials II, edited by M., Ward-Close (TMS, Warrendale, PA, 1997), pp. 417–430.Google Scholar
7. Pilch, M. and Erdman, C.A., Int. J.Multiphase Flow, 13(6), 741 (1987).Google Scholar
8. Handbook of Chemistry and Physics, 63rd ed. (CRC Press, Inc., Boca Raton, FL, 1982).Google Scholar
9. Gessinger, G.H., Powder Metallurgy of Superalloys, (Butterworths, London, 1984), p. 43.Google Scholar
10. Kamps, R., Plewinsky, B., Miehe, M. and Wetz, K., U.S. Patent No. 4,557,718 (10 Dec 1985).Google Scholar
11. Fox, R.W. and McDonald, A.T., Introduction To Fluid Mechanics, 4th ed. (Wiley, New York, 1992).Google Scholar
12. Yolton, C.F. and Moll, J.H., U.S. Patent No. 4,544,404 (1 Oct 1985).Google Scholar