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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
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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

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References

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