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Deformation Behavior and Tensile Properties of the Semi-Equiaxed Microstructure in Near Alpha Titanium Alloy
oleh: Minglang Luo, Tingyi Lin, Lei Zhou, Wei Li, Yilong Liang, Moliu Han, Yu Liang
Format: | Article |
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Diterbitkan: | MDPI AG 2021-06-01 |
Deskripsi
The tensile deformation and fracture behavior of a particular semi-equiaxed microstructure (S-EM) in a near alpha titanium alloy TA19 are investigated by an in situ method. In the S-EM, the thin β lamellae grow through the equiaxed α<sub>p</sub> phase (α<sub>p</sub>), and the original α<sub>p</sub>/β<sub>trans</sub> interface in the bimodal microstructure largely disappears, forming a blurry interface between the semi-equiaxed α<sub>p</sub> phase (equiaxed α<sub>p</sub> phase that is grew through by the thin β lamellae) and the transformed β microstructure (β<sub>trans</sub>). The formation of dense slip bands inside the semi-equiaxed α<sub>p</sub> phase in the S-EM is inhibited by the thin β lamellae during the tensile deformation. The special characteristics of the S-EM reduce the stress concentration at the interface, and the crack initiation probability in the blurry semi-α<sub>p</sub>/β<sub>trans</sub> interface decreased compared to the distinct α<sub>p</sub>/β<sub>trans</sub> interface in a conventional equiaxed microstructure (EM). Moreover, the ultimate tensile strength of the S-EM is higher than that of the EM with a slight loss of plasticity.