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1 Journal of Achievements in Materials and Manufacturing Engineering

1 2007

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Damage mechanisms of Ti-Al intermetallics in three point ultrasonic bending fatigue

Bayraktar E., Xue H., Bathias C.

Journal of Achievements in Materials and Manufacturing Engineering

2007

Vol. 24, nr 1

153-161

Purpose: Damage mechanisms of two phases (alpha2-Ti3Al and gamma-Ti-Al) intermetallics alloy are investigated at room temperature in a new developed resonance type 3- point (3P) fatigue bending test device at a frequency of 20 kHz. Design/methodology/approach: Manufacturing and analysis of composition of this alloy were carried out in advanced materials laboratory by collaborating with aircraft design engineering department for non-ferrous metal research centre in China. All of the 3P- fatigue bending were carried out at the stress ratios of R=0.1, R=0.5, R=0.7 mainly in gigacycle regime. Findings: Damage mechanisms were compared in static and dynamic test conditions. The geometries of static tensile test and ultrasonic fatigue test specimens have been calculated by analytical or numerical method as discussed in detail formerly. This paper gives further results and more complicate discussion on this study particularly on the crack formation and the role of the different parameters on the damage mechanisms of this alloy. Damage analysis was made by means of optical (OM) and Scanning Electron Microscopies (SEM). Research limitations/implications: Paper gives results and more complicate discussion on the crack formation and the role of the different parameters on the damage mechanisms of this alloy. Originality/value: This study proposes a new methodology for fatigue design and a new idea on the criterion for the damage under very high cycle fatigue regime. The results are well comparables for the specimens under real service conditions. This type of study gives many facilities for the sake of simplicity in industrial application.