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On Improving the Fracture Toughness of a Niai-Based Alloy by Mechanical Alloying

Published online by Cambridge University Press:  26 February 2011

J. Kostrubanic ,
D.A. Koss ,
I.E. Locci  and
M. Nathal
J. Kostrubanic
Affiliation:
Dept. of Mat. Sci. & Eng., Penn State University, University Park, PA 16802
D.A. Koss
Affiliation:
Dept. of Mat. Sci. & Eng., Penn State University, University Park, PA 16802
I.E. Locci
Affiliation:
NASA Lewis Research Center, Cleveland, OH 44135
M. Nathal
Affiliation:
NASA Lewis Research Center, Cleveland, OH 44135
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Abstract

Mechanical alloying (MA) has been used to process the NiAl-based alloy Ni-35Al-2OFe such that a fine-grain (∼2 μm) microstructure is obtained through the addition of 2 v/o Y2O3 particles. When compared to a conventionally processed, coarse-grained (∼;28 μm) Ni-35–20 alloy without the Y2O3 particles, the MA alloy exhibits two to three times higher fracture toughness values, despite a 50% increase in yield strength. Room temperature KQ values as high as 34 √Pa m are observed accompanied by a yield strength in excess of 1100 MPa. Fractography confirms a change in fracture characteristics of the fine-grained MA alloy.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 213: Symposium Q – High-Temperature Ordered Intermetallic Alloys IV , 1990 , 679
Copyright
Copyright © Materials Research Society 1991

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References

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