A Comparative Study on the Substructure Evolution and Mechanical Properties of TIMETAL ® 407 and Ti-64

• Published in: MATEC Web of Conferences Vol. 321; p. 11045
• Main Authors: Kloenne, Zachary, Viswanathan, Gopal, Thomas, Matt, Lorreto, M.H., Fraser, Hamish L.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Les Ulis EDP Sciences 2020
• Subjects: Airframes; Comparative studies; Deformation mechanisms; Energy absorption; Fuselages; High strain rate; Landing gear; Machinability; Mechanical properties; Slip; Strength to weight ratio; Substructures; Titanium alloys; Titanium base alloys; Twinning
• ISSN: 2261-236X; 2274-7214; 2261-236X
• DOI: 10.1051/matecconf/202032111045

Titanium and titanium alloys are excellent candidates for aerospace applications owing to their high strength to weight ratio. Alpha/beta titanium alloys are used in nearly all sections of the aircraft, including the fuselage, landing gear, and wing. Ti-6Al-4V is the workhorse alloy of the titanium industry, comprising of nearly 60% of total titanium production. TIMETAL® 407 , Ti-0.85Al-3.9V-0.25Si-0.25Fe (Ti-407) is an excellent candidate for alloy applications requiring excellent machinability and increased energy absorption. These properties are a result of the alloy’s increased ductility while maintaining moderate levels of strength. In this study, the deformation mechanisms of Ti-407 have been studied at high strain rates using split-Hopkinson bar testing. Utilizing post-mortem characterization, Ti-407 has been shown to deform significantly by ⟨c+a⟩ slip and deformation twinning. The observation of ⟨c+a⟩ slip is in contrast with other studies and will be discussed further.