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Fatigue of Extruded Steel/Nial Composites

Published online by Cambridge University Press:  15 February 2011

M. K. Bannister ,
S. M. Spearing ,
J. P. A. Löfvander  and
M. De Graef
M. K. Bannister
Affiliation:
High Performance Composite Center, Materials Department, College of Engineering, University of California, Santa Barbara CA 93106
S. M. Spearing
Affiliation:
High Performance Composite Center, Materials Department, College of Engineering, University of California, Santa Barbara CA 93106
J. P. A. Löfvander
Affiliation:
High Performance Composite Center, Materials Department, College of Engineering, University of California, Santa Barbara CA 93106
M. De Graef
Affiliation:
High Performance Composite Center, Materials Department, College of Engineering, University of California, Santa Barbara CA 93106
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Abstract

Fatigue tests were performed on a novel, extruded, stainless steel/NiAl composite having good impact and tensile properties. A high fatigue limit was observed to occur at approximately 67% of the σUTS. The fracture surface showed a distinct change in morphology between the fatigued and fast fracture areas and the formation and growth of microcracks was postulated as the initial fatigue mechanism. The microcrack development was monitored by intermittent measurement of the elastic modulus and associated hysteresis. Microstructural characterization by means of SEM, TEM and EDS revealed the existence of approximately 100nm diameter Al2O3 particles decorating the interface between the NiAl and the stainless steel tubes.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 273: Symposium Q – Intermetallic Matrix Composites II , 1992 , 177
Copyright
Copyright © Materials Research Society 1992

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References

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