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Microstructural Evaluation of LENS™ Deposited Nb-Ti-Si-Cr Alloys

Published online by Cambridge University Press:  11 February 2011

Ryan R. Dehoff ,
Peter M. Sarosi ,
Peter C. Collins ,
Hamish L. Fraser  and
Michael J. Mills
Ryan R. Dehoff
Affiliation:
Materials Science and Engineering Department, The Ohio State University Columbus, OH 43201, U.S.A.
Peter M. Sarosi
Affiliation:
Materials Science and Engineering Department, The Ohio State University Columbus, OH 43201, U.S.A.
Peter C. Collins
Affiliation:
Materials Science and Engineering Department, The Ohio State University Columbus, OH 43201, U.S.A.
Hamish L. Fraser
Affiliation:
Materials Science and Engineering Department, The Ohio State University Columbus, OH 43201, U.S.A.
Michael J. Mills
Affiliation:
Materials Science and Engineering Department, The Ohio State University Columbus, OH 43201, U.S.A.
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Abstract

Nb-Ti-Si “in-situ” metal ceramic composites consist of Nb3Si and Nb5Si3 intermetallic phases in a body centered cubic Nb solid solution, and show promising potential for elevated temperature structural applications. The addition of Cr has also been shown to increase the oxidation resistance at high temperatures. In this study, the LENS™ (Laser Engineered Net Shaping) process is being implemented to construct the Nb-Ti-Cr alloy system from elemental powder blends. Advantages of the LENS™ process include the ability to produce near net shaped components with graded compositions as well as a more uniform microstructure resulting from the negative enthalpy of mixing associated with the silicide phases. This study focuses on characterization of the microstructure of the Nb-27Ti-5Si-10Cr (at%) system using SEM and TEM analysis.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 753: Symposium BB – Defect Properties and Related Phenomena in Intermetallic Alloys , 2002 , BB2.6
Copyright
Copyright © Materials Research Society 2003

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References

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