Effect of annealing temperature on microstructure and properties of titanium target

As the annealing temperature increased from 650 ℃ to 800 ℃, the tensile strength and specified non-proportional extension strength of titanium target decreased gradually, and the elongation increased gradually. Compared with the hot-rolled state, when annealing at 650 ℃, the tensile strength and the specified non-proportional extension strength were reduced by about 72 MPa and 128 MPa respectively, and the elongation was increased by 15%. When the temperature continues to rise to 800 ℃, the tensile strength and the specified non-proportional extension strength are reduced by 113 MPa and 168 MPa respectively, and the elongation is increased by 34. 5%. After annealing at 650 ~ 800 ℃, the tensile strength of titanium plate can meet the requirements of mechanical properties at room temperature in the technical requirements.

Considering the target material's requirements on the hardness of titanium plate, when the annealing temperature was 650 ℃, vickers hardness value was about 104 MPa. Although it was 33% lower than the hot-rolled state, it still could not meet the requirement that vickers hardness in the target material was no more than 100 MPa. When annealed at 700 ~ 800 ℃, vickers hardness value decreased to less than 100 MPa.

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