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Study on nonuniform deformation behavior and mechanical properties of complex-shaped Ti-6Al-4 V extruded profiles with different lubrication conditions

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Abstract

Titanium alloy extruded profiles with complex cross-section are usually used to manufacture special-shaped structural parts in the aviation industry. In this paper, a Ti-6Al-4 V profile with asymmetric Y shape was manufactured by a direct extrusion process. A comparative study was conducted at the different lubrication conditions, in which the different process deformation mechanisms, resulting microstructures, and mechanical properties of profiles have been investigated by finite element simulation and a series of experiments, i.e., scanning electron microscope (SEM) and electron backscatter diffraction (EBSD). It was revealed that the metal flow is blocked at the narrow die orifice due to the deterioration of lubrication, resulting in the continuous shrinkage defect. The metal deformation coordination mechanism becomes gradually significant due to poor friction contact, which promotes the internal stress in the cross-sectional center to transfer outward to balance the friction at the edge of the orifice, resulting in the reduction of the effective strain in the center. The heat generated by friction weakens the heat exchange behavior between the metal and the die, which helps the profile retain a more uniform temperature field. In the sectional center of the profiles made from the two different lubrications, extrusion with good lubrication results in greater grain/colony refinement due to greater effective strains, and a slightly greater dislocation density was found due to the uniform deformation. The tensile tests revealed that compared with poor lubrication, due to the improvement of Hall–Petch strengthening and dislocation strengthening in the cross-sectional center with good lubrication, the variation range of yield strength and tensile strength is reduced to 11 MPa and 7 MPa, respectively, and the variation range of microhardness is reduced to 44 HV and 32 HV, respectively. The improvement of lubrication not only helps to reduce forming defects but also can obtain uniform mechanical properties.

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The raw/processed data required to reproduce these findings cannot be shared at this time as the data also forms part of an ongoing study.

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Funding

This work is financially supported by the National Natural Science Foundation of China (No. 51975032 and No.51775023) and Commercial Aircraft Corporation of China (COMAC-SFGS-2020–3227).

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Authors and Affiliations

  1. School of Mechanical Engineering & Automation, Beihang University, Beijing, 100191, China

    Ying Zhang, Dongsheng Li, Xiaoqiang Li & Yong Li

  2. Institute of Metals, College of Materials Science and Engineering, Changsha University of Science & Technology, Changsha, 410004, China

    Xiaochun Liu

  3. Changcheng Special Steel Corporation of Pangang Group, Jiangyou, 621701, China

    Huailiu Wang

  4. Institute of Aviation Manufacturing Technology, Shanghai Aircraft Manufacturing Corporation, Shanghai, 201324, China

    Zhibin Huang

Authors
  1. Ying Zhang
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Correspondence to Dongsheng Li.

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Highlights

• Ti-6Al-4V alloy profile with asymmetric Y shape was manufactured at two lubrication conditions.

• The metal flow velocity at the cross-section tail decreases significantly due to poor frictional contact, resulting in continuous shrinkage defects.

• The microstructure of the cross-sectional center subjected by the low strain field is not refined, and high temperature contributes to the dislocation recovery.

• The coarse colony and low dislocation density caused by nonuniform deformation promote lower yield strength, tensile strength, and microhardness.

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Zhang, Y., Li, D., Li, X. et al. Study on nonuniform deformation behavior and mechanical properties of complex-shaped Ti-6Al-4 V extruded profiles with different lubrication conditions. Int J Adv Manuf Technol 121, 5885–5899 (2022). https://doi.org/10.1007/s00170-022-09623-0

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  • DOI: https://doi.org/10.1007/s00170-022-09623-0

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