Influence of different preparation processes on the microstructure and properties of Ti-5.1Al-3.1Mo-2.9Cr-0.9Zr alloy
Le résumé fourni par la source
Ti-5.1Al-3.1Mo-2.9Cr-0.9Zr alloy has comprehensive high-performance characteristics such as high strength， high plasticity， high toughness， resistance to high-speed impact， fatigue resistance， and damage tolerance.It has broad application prospects in the fields of transportation and aerospace.In this study， different forging and heat treatment processes （two-phase zone forging and double annealing， quasi-β forging and double annealing， and two-phase zone forging and quasi-β annealing） were applied to the Ti-5.1Al-3.1Mo-2.9Cr-0.9Zr alloy， resulting in three typical microstructures： bimodal， basketweave， and lamellar.Through the microstructure and fracture analysis of room temperature tensile， the relationship between microstructure and fracture and the correlation between mechanical properties and fracture are analyzed and discussed.The results show that the basketweave structure formed by quasi-β forging + double annealing has the highest room temperature mechanical properties， reaching 1085.7 MPa， yield strength of 956.7 MPa， and elongation of 13.2%， and the lamellar microstructure formed by two-phase zone forging and quasi-β annealing has the lowest strength and ductility， with a tensile strength of 956.0 MPa， a yield strength of 853.0 MPa， and an elongation of 9.9%， and the bimodal microstructure formed by two-phase zone forging and double annealing exhibits the best ductility， with a tensile strength of 974.3 MPa， a yield strength of 884.3 MPa， and an elongation of 16.7%.The fracture mechanisms are all ductile fractures， but there are slight differences in fracture morphologies.The study concludes that the microstructure of titanium alloy is closely related to performance and the heat treatment process is crucial.These conclusions provide theoretical basis and technical support for the application of this alloy in transportation and other fields.
Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.