Effect of Microstructure on High-Speed Tensile Mechanical Properties of Ti-1300 Alloy

Abstract

It is usually required that Ti-1300 alloys be able to withstand a greater load under special conditions, such as the controllable collision of a space shuttle and rapid collision of an automobile. Because of a good combination of strength and toughness, Ti-1300 alloys are widely applied in the aerospace industry. However, during the service process, the alloy components inevitably bear extreme loads. This paper uses high-speed tensile technology to systematically study the effects of different strain rates on the deformation of the microstructure and deformation mechanism of Ti-1300 alloys and to clarify a relation between the microstructure and mechanical properties. The results show that no phase transformation occurs during the high-speed tensile process at strain rates of 200 s−1 and 500 s−1. The deformation mechanism is mainly due to dislocation slip. The fracture mode is ductile fracture at the two strain rates, due to the connection between micro-voids promoted by dislocation slip. The ultimate tensile strengths are 1227 MPa and 1368 MPa, the yield strengths are 1050 MPa and 1220 MPa, and the elongations are 11.3% and 10.4%, respectively. The present results provide theoretical guidance for the further application of metastable β titanium alloys in working environments with high strain rates.

Decision Science-Driven Assessment of Ti Alloys for Aircraft Landing Gear Beams

“…The current analysis offers guidance, making it feasible to generate exhaustive data tailored to specific application requirements on a limited number of alternatives, thereby optimizing cost, time and effort as described earlier. The above analysis draws support from the fact that the fracture toughness of the alloys Ti1300-BM-nano-α (rank 1) and Altan Titan 23-BM-nano-α (rank 5) are >50 MPa(m) 0.5 [52,82] and 60 MPa(m) 0.5 [53], respectively and would meet the general expectations of the requirement for around 45 MPa(m) 0.5 [8]. The fatigue limit of the Altan 23-BM-nano-α has been reported as 1033 MPa for 10 7 cycles at R = 0.1, K t = 1, and 30 Hz test conditions [53].…”

“…Thus, it appears that the top-ranked alloys arrived at using the MADM approach with the easily available attributes of d, YS, and %EL seem to show that the other attributes like fracture toughness and fatigue would likely meet the requirements for the intended application for these alloys having some basic similarities concerning chemistries, thermomechanical processes, and microstructures, as suggested above. Further testing of the top-ranked alloys for fracture toughness, fatigue, corrosion resistance, etc., is recommended to complete the comprehensive assessment as indicated in some of the research work [18][19][20][21][22][23][24][25][26][27]30,52,53,82,[84][85][86]. The corrosion resistance of these alloys is also expected to meet the requirements.…”