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Effects of Fe and Mn Additions on the Ductility and Fracture of Ni3Al

Published online by Cambridge University Press:  28 February 2011

Dennis M. Dimiduk ,
Vicky L. Weddington  and
Harry A. Lipsitt
Dennis M. Dimiduk
Affiliation:
Afwal Materials Laboratory, AFWAL/MLLM, Wright-Patterson AFB, OH 45433-6533
Vicky L. Weddington
Affiliation:
Wright State University, Dayton, OH 45435-0001
Harry A. Lipsitt
Affiliation:
Wright State University, Dayton, OH 45435-0001
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Abstract

Recent studies suggested that additions of either Fe or Mn to polycrystalline Ni3Al without boron, result in a ductile alloy. In the present study the effects of Fe and Mn additions on the strength and ductility of Ni3Al were investigated at 25°C, 600°C in air and at 600°C in vacuum. Metallographic examination showed that with 4 at.% solute a single phase structure existed but at higher solute levels the alloys were two phase. Single phase materials tested in bending showed virtually no plastic strain and low bend strengths at all temperatures. The two phase materials tested at 25°C and 600°C in vacuum showed marked ductility. However, the same alloys tested at 600°C in air exhibited brittle failure. These results suggest that Fe and Mn have no effect on the high temperature dynamic environmental embrittlement known to occur in Ni3Al.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 81: Symposium H – High-Temperature Ordered Intermetallic Alloys II , 1986 , 221
Copyright
Copyright © Materials Research Society 1987

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References

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