Microstructure and anisotropy of mechanical properties of Ti70 alloy plates

doi:10.13251/j.issn.0254-6051.2020.08.007

Abstract

Abstract: Microstructure and anisotropy of mechanical properties of Ti70 alloy plates were studied by tensile test, low temperature impact test, optical microscopy, electron microscopy and X-ray diffraction analysis. The Results indicate that there is no obvious difference in microstructure between hot rolled and annealed Ti70 alloy plates. Recovery is the main process during annealing, with only a certain amount of recrystallized grains being found in the shear band with high density dislocations. The yield strength and low temperature impact absorbed energy of the transverse direction are higher than that of the rolling direction, whereas the tensile strength is just the opposite, indicating that the annealed Ti70 alloy plate shows significant anisotropy. After annealing the Ti70 alloy plate forms relatively strong {0002} basal texture, and its crystal plane normal direction deflects ±30° and ±41° respectively along the RD direction (longitudinal) and the TD direction (transverse). Basal texture is relatively concentrated in the rolling direction, which results in the anisotropy of mechanical properties of the Ti70 alloy plate.

Key words: Ti70 alloy plate, microstructure, mechanical properties, anisotropy

CLC Number:

TG146.23

Hao Xiaobo, Li Bobo, Liu Yinqi, Zhang Qiang, Li Yang. Microstructure and anisotropy of mechanical properties of Ti70 alloy plates[J]. Heat Treatment of Metals, 2020, 45(8): 34-37.

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