Tensile Properties and Deformation Mechanism of Pure Rhenium at Room Temperature and Ultra-High Temperature AITranslate

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Basic Information:

DOI：10.13373/j.cnki.cjrm.XY24070010

Chinese Library Classification Number:TG146.4+18

Citation Information:

Rhenium has high strain hardening index, tensile strength, elastic modulus and hardness, and has no ductile-brittle transition temperature. It is often used in metal-organic chemical vapor deposition (MOCVD) heaters and key components of engines. In order to meet its application in harsh ultra-high temperature service environments such as MOCVD heaters, this paper studied the tensile properties of pure rhenium (PM-Re) prepared by powder metallurgy at room temperature to 2000 ℃. The deformation mechanism of PM-Re was analyzed using scanning electron microscopy (SEM）, electron backscattered diffraction (EBSD）, transmission electron microscopy (TEM）, etc. The results showed that the room temperature tensile strength of PM-Re was 882 MPa. With the increase of temperature, the tensile strength of PM-Re decreased. At 2000 ℃, the tensile strength decreased to 112 MPa. The elongation after fracture of PM-Re at room temperature was 18%. In the temperature range of 1700–2000 ℃, the elongation after fracture was less than 10%. With the increase of temperature, the non-proportional elongation strength (R_p0.2) of PM-Re continuously decreased. At room temperature, R_p0.2 of PM-Re was 171 MPa, and at 1900 and 2000 ℃, it was only 17 and 6 MPa. The room temperature tensile fracture of PM-Re had both intergranular brittle fracture and transgranular fracture. Symmetrical structures along the fracture surface appeared on the grains where transgranular fracture occurred, and dislocation slip traces were found on the fracture surface. At high temperatures, a large number of lamellar structures, dimple-shaped fractures and "river" pattern characteristics appeared in the PM-Re specimens after tensile testing. It was found by EBSD characterization that the original PM-Re sample was composed of equiaxed grains. A large number of twins were produced after the sample was deformed at room temperature. There was a large local orientation difference inside the rhenium grains. The grain boundaries and twin boundaries showed a high local average misorientation (LAM) value. Dislocations were mainly distributed at the grain boundaries and interacted with the twin boundaries. With the increase of temperature, the degree of deformation of PM-Re increased, and the internal point defects and stress concentration areas increased, resulting in a gradual increase in the LAM value of PM-Re. Through the Schmidt factor map, it was found that the average Schmidt factor values of the cylindrical slip system and the conical slip system were the highest at high temperatures, and the non-basal slip system was the main slip system. The twin deformation traces in different directions on the same slip plane and the phenomenon of dislocation aggregation at the twin boundaries after tensile testing at room temperature were found by TEM, indicating that the twin and dislocation interacted, and the twin boundary would become an obstacle to dislocation movement. After tensile testing at 2000 ℃, subgrain boundaries formed by dislocation movement in the PM-Re body. The formation of subgrain boundaries could further hinder the dislocation slip, increase the deformation resistance of the material, and at the same time, the subgrain boundaries could coordinate the deformation between adjacent grains and effectively improve the uniform deformation ability of PM-Re. The above results showed that during the room temperature deformation process of PM-Re, twin deformation and dislocation slip coexisted. Twin deformation could improve the plasticity of rhenium, and dislocation cells and twin boundaries would hinder dislocation movement and thereby increase the work hardening rate of rhenium. The ultra-high temperature deformation process of PM-Re was dominated by dislocation slip, the non-basal slip system was the main slip system, and the basal slip system gradually opened at 2000 ℃.