Microstructures and mechanical properties of Ti-45Al-10Nb alloy produced by ball milling and hot press consolidation

The microstructures and properties of powder metallurgy Ti-45Al-10Nb (at.%) alloys fabricated by vacuum hot pressing consolidation of milled powder have been investigated. Under the sintering conditions, the alloy exhibits much fine-grained microstructure, which consists of a double phase γ + α2 microstructure containing Ti2AlC precipitates. Tensile properties are measured at 900 °C–1000 °C under a strain rate of 1 × 10−4 s−1. This alloy displayed outstanding high-temperature tensile strength, with tensile strength (UTS) 410.2 MPa and elongation (ε) 12.5% at 900 °C, and UTS 189 MPa and ε 16.7% at 1000 °C, respectively.