|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Fatigue in Materials: Fundamentals, Multiscale Modeling and Prevention
||Effects of Alloying and Microstructure on Ultrasonic Fatigue Behavior of Binary Ti-Al Alloys
||Qianying Shi, Sinsar Hsie, J. Wayne Jones, John Allison
|On-Site Speaker (Planned)
Binary Ti-Al alloys (Ti-4wt.%Al and Ti-7wt.%Al) were investigated in this study to develop a fundamental understanding of very high cycle fatigue behavior of alpha-titanium alloys. Heat treatment on cogged and rolled alloys was carried out to obtain target microstructures with different grain size and recrystallization degree. Ultrasonic fatigue instrumention and a custom combination of ultrasonic fatigue and scanning electron microscopy were used under fully reversed loading to study small crack growth from FIB-produced micro-notches for materials with a range microstrucutures. The role of aluminum content, grain size and recrystallization degree were explored through the ex-situ and in-situ characterization of crack initiation sites, crack propagation paths and crack growth rates. Current results indicated no significant difference in fatigue lifetimes, crack initiation and growth rates between alloys with different aluminum content, in spite of the significantly higher yield and tensile strength in the Ti-7wt.%Al alloy. The explanations for this behavior are discussed.
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