Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8015111 | Materials Letters | 2018 | 4 Pages |
Abstract
A novel β-stabilized Ti-43Al-9V-0.2Y alloy sheet with a nano-scaled antiphase domain (APD) microstructure and excellent performance was fabricated via hot-pack rolling in the (αâ¯+â¯Î³) phase region (1260â¯Â°C). Owing to the temperature drop and reheat associated with multi-pass rolling, heterogeneous and regular APD-mixed lamellar structures formed with the occurrence of αâ¯ââ¯Î²â¯+â¯Î³ and αâ¯ââ¯Î±2â¯+â¯Î³ phase transformations. The antiphase boundary (APB) between two nano-scaled APD structures (average size: â¼15â¯nm) is identified as a type of atomic shift, which is induced by the disorder-order transformation in the α2 phase. Moreover, compared with the corresponding as-forged alloy and other hot-working β-stabilized TiAl alloys, the current alloy sheet exhibited higher strength both at room and elevated temperatures. The improvement in the tensile properties is attributed mainly to the duplex microstructure consisting of fine nano-scaled APD/lamella mixed structures.
Related Topics
Physical Sciences and Engineering
Materials Science
Nanotechnology
Authors
Yu Zhang, Xiaopeng Wang, Fantao Kong, Yuyong Chen,