SEDL / STP / STP1450-EB / STP11283S

Mechanism-Based Variability in Fatigue Life of Ti-6Al-2Sn-4Zr-6Mo

Jha, SK
Systran Federal Corporation, Dayton, OH

Larsen, JM
Air Force Research Laboratory, Materials and Manufacturing Directorate, AFRL/MLLMN, Wright Patterson AFB, Dayton, OH

Rosenberger, AH
Air Force Research Laboratory, Materials and Manufacturing Directorate, AFRL/MLLMN, Wright Patterson AFB, Dayton, OH

Hartman, GA
The University of Dayton Research Institute, Dayton, OH

Pages: 12    Published: Jan 2004

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Abstract

The variability in fatigue life of a Ti-6Al-2Sn-4Zr-6Mo alloy was studied. The cumulative life distribution plot was found to be composed of two distinct failure mechanisms, designated as Type-I and Type-II. The likelihood of Type-I vs. Type-II failure shifted with respect to the stress level, such that at lower stress levels, there was increased probability of Type-II failure. It also was found that the variability in life was introduced primarily at the crack nucleation stage, specifically, formation of a stage-I crack across an equiaxed primary-α particle.