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Fatigue of in situ Reinforced Ti–8.5Al–1B–1Si

Published online by Cambridge University Press:  03 July 2012

S. Rangarajan ,
P. B. Aswath  and
W. O. Soboyejo
S. Rangarajan
Affiliation:
Materials Science and Engineering Program and Mechanical and Aerospace Engineering Department, University of Texas at Arlington, Arlington, Texas 76019
P. B. Aswath
Affiliation:
Materials Science and Engineering Program and Mechanical and Aerospace Engineering Department, University of Texas at Arlington, Arlington, Texas 76019
W. O. Soboyejo
Affiliation:
Department of Materials Science and Engineering, The Ohio State University, Columbus, Ohio 43210
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Abstract

The effect of temperature on the fatigue and fracture properties of an in situ reinforced super α alloy Ti–8.5Al–1B–1Si (wt. %) was investigated. At room temperature the as-extruded composite has a strength of 631 MPa with limited ductility. On increasing the temperature to 700 °C only a marginal drop in strength to 610 Mpa was observed along with a significant improvement in ductility to 5.9%. Low-cycle fatigue results indicate a marginal decrease in fatigue life as temperature is increased from room temperature to 700 °C. Fatigue crack growth studies in the as-extruded microstructure indicate a strong influence of R-ratio on both the threshold for fatigue crack growth and crack growth rates in the Paris regimes. At elevated temperatures, the resistance to fatigue crack growth increases with temperature below approximately 500 °C. At 600 °C, however, there is an increase in the near threshold crack growth rate due to embrittlement effects. At higher δK values , the resistance to fatigue crack growth at elevated temperatures is always better than that at room temperature. This improvement is attributed to the increase in the inherent resistance

Type
Articles
Information
Journal of Materials Research , Volume 12 , Issue 4 , April 1997 , pp. 1102 - 1111
Copyright
Copyright © Materials Research Society 1997

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