Fabricating Ti2AlNb sheet with tensile strength higher than 1500 MPa by hot packed rolling spark-plasma-sintered pre-alloyed Ti2AlNb powder at the B2 + O phase field.

• High-strength Ti 2 AlNb sheet was fabricated by hot packed rolling the spark-plasma-sintered pre-alloyed powders. • Extreme high tensile strength of 1532 MPa without any post heat treatment was obtained after two rolling passes. • The micro-sized O and nano-sized O phases contributed to the high tensile strength of the sheet. In this work, we fabricated high-strength Ti 2 AlNb sheets by hot packed rolling the spark-plasma-sintered pre-alloyed powders at the B2 + O phase field. We rolled the sheets with three different schemes, namely, sheet A (thickness reductions of 42% + 42%), sheet B (30% + 30% + 30%), and sheet C (30% + 21% + 21% + 21%). Results showed that the spheroidizing of the O phase occurred during the multiple rolling processes, and sheet C consisted of only spherical O phases. The mechanical property tests showed that Ti 2 AlNb sheets with tensile strengths higher than 1400 MPa could be obtained without any post heat treatment. Both micro-sized O and nano-sized O phases contributed to the excellent mechanical properties of the sheets. The multiple rolling processes resulted in slight decreases in tensile strength but an increase in ductility. All sheets showed brittle fracture mode with reduction of area smaller than 5%. [ABSTRACT FROM AUTHOR]