Development of a New Moderate Strength, High Fracture Toughness Titanium Alloy: Ti-4.5A1-5Mo-L.5Cr (Corona 5)
The properties of Ti-6A1-4V remain attractive and provide a guideline for materials selection when considering the relative design efficiency achievable with titanium, aluminum and steel. However, the potential for further property improvements in this alloy by chemical composition modifications or by new thermomechanical processing (IMP) sequences appear to be very limited. The requirements of modern aircraft, which are designed with the aid of fracture mechanics criteria, has led to the need for an alloy whose strength is slightly greater than Ti-6A1-4V in the annealed condition and whose plane strain fracture toughness is significantly higher.
KeywordsFracture Toughness Fatigue Crack Propagation Compact Tension Intergranular Crack Fatigue Crack Propagation Rate
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