Texture Evolution and Mechanical Properties of TA1 Pure Titanium Plate with Different Deformation Temperatures AITranslate

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Basic Information:

DOI：10.13373/j.cnki.cjrm.XY23090019

Chinese Library Classification Number:TG146.2

Citation Information:

In this paper，TA1 pure titanium plate was taken as the research object，and the TA1 pure titanium plate was rolled at 650，750，850 and 950 ℃ deformation temperature，respectively，the deformation degree was 60%，and the same heat treatment system was used to heat treat the plate samples. Electron back scatter diffraction （EBSD）technology and tensile tester were used to represent and test the microstructure，texture and mechanical properties of annealed TA1 pure titanium plate. The factors affecting the mechanical properties of TA1 pure titanium plates were analyzed and the mechanism of the influence of the texture on the mechanical properties was revealed. With the increase of the deformation temperature of the annealed plate，the tensile strength and yield strength increased，the post fracture elongation rate decreased，and the grain size increased. At the same time，with the change of the deformation temperature，the texture strength and type of the plate changed obviously. The mechanical properties of the materials were affected by grain size and texture. The growth of grain promoted the decrease of elongation rate after fracture，mainly due to the small grain boundary content of large grain，which hindered the initiation and extension of crack in the stretching process was small，leading to the decrease of plasticity. The change of the strength of TA1 pure titanium plate with the deformation temperature was mainly affected by the change of the texture，which mainly affected the different sliding systems activated during the plastic deformation of materials，and thus affected the mechanical properties of the plate. With the increase of deformation temperature，the plate crystal turned，leading to the difference of texture，which transformed from ‖normal direction （ND）at lower temperature to ‖rolling direction （RD）at low temperature and higher temperature. In the stretching process，the pyramidal texture of ‖ND formed by the annealed plate rolled at lower temperature was easier to activate {10$\overline{1}$0}< 11$\overline{2}$0> prismatic slip system under the transverse direction （TD）loading，which was easier to occur plastic deformation，resulting in lower strength，the pyramidal texture of ‖RD formed by the annealed plate rolled at higher temperature was difficult to activate the {10$\overline{1}$0}<11$\overline{2}$0> prismatic slip system under the TD loading，which was difficult to occur plastic deformation，resulting in higher strength. Therefore，with the increase of the deformation temperature，the transverse strength of the annealed plate showed an increasing trend at room temperature. The transverse yield strength and grain size of polycrystalline metallic materials followed Hall-Petch relation，and for strength factor k value of hexagonal close packed （hcp）metals in the formula was highly dependent on the crystal orientation. Mainly due to the strong mechanical property anisotropy of hcp materials，it would hinder the deformation from one grain to another grain，so that the grain boundary enhancement effect of hcp material was more obvious than that of face-centered cubic （fcc）and body-centered cubic （bcc）materials. k value reflected the magnitude of the slip propagation from a grain to its neighbor grains hindered by the grain boundary. An easier deformation transfer implied a lower boundary hindrance action and would result in a lower value of k. Thus，the effect of texture on k could be described by the ease of deformation transmission between neighboring grains. The propagation of the slip between adjacent grains depended on the externally applied stress and the stress concentration generated by the dislocation stacking at the grain boundaries. Under the action of the same external stress，due to the different crystal orientation between the adjacent particles，the sliding system activated by the particles had different split stress of the external load，and also due to the internal stress generated by the dislocation of the adjacent particles. Therefore，the change in k value with orientation was mainly attributed to the different deformation mechanisms. The deformation mechanism with higher critical tangent stress would correspond to higher k values. With the increase of deformation temperature，k value in Hall-Petch relationship increased，that was，the difficulty of deformation transmission between grains increased，which led to the increase of strength. Under external force，the deformation between adjacent grains with the same orientation was easy to transfer，which reduced the strength of the material and increases the plasticity；random crystal orientation could activate more types of slip system and lead to multiple deformation transfer modes，thus weakening the influence of orientation on the ease of grain boundary deformation transfer. Therefore，the random crystal orientation would make the plate have higher strength and better performance consistency.