Mechanical Behavior of Titanium Alloys under Different Conditions of Loading

Abstract:

Taking three titanium commercial alloys: commercial purity titanium (c.p.Ti, single-phase α), Ti64 (Ti-6(wt.%)Al-4V, two-phase α+β) and TIMETAL-LCB (Ti-1.5Al-4.5Fe-6.8Mo, both two-phase α+β and single-phase β) as program materials, the influence of phase composition, microstructure and deformation rate (V_D, varied from 10^-4 to 10¹ s^-1), and deformation mode (compression and 3-point flexure) on the mechanical behavior was studied and compared with data earlier obtained during tensile tests. The size of the matrix phase (alpha- or beta-grains) size and morphology of α+β intragranular mixture were varied using different treatments. Deformation Energy (U_D) was used for analysis of the mechanical behavior of the materials tested. It was found that the U_D dependencies on deformation rate are different for different methods of loading and are determined by a combination of the phase composition, dispersion, and morphology of the phase constituents. More ductile and less dependent on V_D behavior showed c.p.Ti and Ti64 with globular microstructure on all three testing modes, while other materials had some negative features depending on the certain test conditions. Details of mechanical behavior, peculiarities of pores and cracks nucleation causing in final fracture are discussed basing on the results of detailed microstructure study of tested specimens.

• Periodical: Materials Science Forum (Volume 941)
• Pages: 839-844
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.941.839
• Online since: December 2018
• Authors: Pavlo E. Markovsky
• Keywords: Deformation Energy, Deformation Mode, Deformation Rate, Fracture, Mechanical Behavior, Mechanical Properties, Microstructure, Phase Composition, Titanium Alloy

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