Short‐Step Fabrication of High‐Strength Ti‐22Al‐25Nb Alloy via the Fast Hot‐Press Sintering

The Ti‐22Al‐25Nb alloy is a key material widely used in the aerospace industry, with service temperatures ranging from 600°C to 800°C. However, the alloy's fabrication process remains complex, and its high‐temperature properties remain limited. In this work, molecular dynamics (MD) simulations are used to analyze the sintering behavior. Fast hot‐press sintering (FHPS) is employed to fabricate the high‐strength Ti‐22Al‐25Nb alloy without heat treatment. The ultimate tensile strength of the samples sintered at 1000°C is 1405 ± 11 MPa as tested at room temperature, while that of the as‐sintered sample fabricated at 1300°C is 820 ± 20 MPa as tested at 800°C. The high‐strength stems from its inherently robust matrix, characterized by a fine grain size coupled with a large volume fraction of O/O′ phases, which can bear the load. The samples sintered at 1300°C exhibit high O texture strength, characterized by hard orientations and suppressed slip systems. Combined with MD, Nb exhibits a slow diffusion rate during sintering. Combining transmission electron microscopy (TEM) observations suggests that the slow‐diffusing Nb promotes the formation of a cross‐inserted O‐phase lamella (O′). O′ could inhibit primary O grain growth and pin dislocations, which contribute to the high‐temperature tensile strength.