Effect of heat treatment temperature on microstructure and mechanical properties of TC4ELI alloy

doi:10.13251/j.issn.0254-6051.2020.02.032

Abstract

Abstract:

In order to reveal the microstructure evolution, mechanical properties and phase composition of TC4ELI alloy with different heat treatment temperatures, the microstructure of TC4ELI alloy heat treated at 700-1000 ℃ with air-cooling conditions was studied, and the room temperature mechanical properties and XRD of the samples were tested. The results show that the alloy achieves crystallization when heat treated at 800 ℃. The α phase is homogeneous and equiaxial, and its volume fraction reaches the maximum. There are all diffraction peaks of the α phase in the XRD pattern but for the β phase. In the range of 700-800 ℃, the alloy can obtain the good comprehensive performance, and meet the requirement of related standards. In the temperature range of 850-950 ℃, the TC4ELI alloy is the bimodal microstructure with the precipitation of the secondary needle-like α phase. As the temperature increases, the strength and elastic modulus decrease due to the increase of grain size and volume fraction of the β phase in the alloy. After heat treated at 1000 ℃, the cubic martensite phase has strong (002)_α' and (101)_α' diffraction peaks, and the diffraction peak energy of other lattice orientations is very weak, and the elastic modulus of the alloy reaches a maximum of 110 GPa. Through microstructure observation, the start temperature of α+β→β transformation is in the range of 850-870 ℃, and the finish temperature of that is in the range of 950-970 ℃.

Key words: titanium alloy, TC4ELI, heat treatment, microstructure, mechanical properties, elastic modulus, phase composition

CLC Number:

TG146.2⁺3

Mao Jianghong, Yang Xiaokang, Luo Binli, Wei Fenrong. Effect of heat treatment temperature on microstructure and mechanical properties of TC4ELI alloy[J]. HTM, 2020, 45(2): 166-174.

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