Study on Microstructure Evolution and Mechanical Properties of Ti₂AlNb-Based Alloy under Canning Compression and Annealing

• Main Authors: Sibing Wang, Wenchen Xu, Wanting Sun, Yingying Zong, Yu Chen, Debin Shan
• Format: Article
• Language: English
• Published: MDPI AG 2019-09-01
• Series: Metals
• Subjects: Ti₂AlNb-based alloy; microstructural evolution; mechanical property; recrystallization; texture
• Online Access: https://www.mdpi.com/2075-4701/9/9/980

The influence of height reduction on the microstructure evolution and mechanical properties of the Ti₂AlNb-based alloy was investigated during canning compression and subsequent annealing. After the annealing treatment, the spheroidized B₂ phase grains occurred because of partial recrystallization. Meanwhile, the texture evolution of the B₂ phase and O phase were analyzed under the deformation degree, ranging from 25% to 75%. The results show that the mechanical properties of the post-annealed alloys were co-affected by the grain size and Schmid factor of the B₂ phase. When the height reduction was less than 25%, the compression strength was mainly affected by the grain size. When the height reduction was higher than 50%, it was mainly dominated by the Schmid factor. When the deformation degree reached 75%, the recrystallized grain size decreased to 0.9 μm. Meanwhile, the Schmid factor of a {110}<001> slip system in B₂ phase reduced to 0.34. Therefore, the yield strength of the Ti₂AlNb alloy at room temperature increased from 892 MPa in the as-rolled condition to 935 MPa after the canning compression and annealing.