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Yield Criteria for Ductile Materials under Plane Stress01:25

Yield Criteria for Ductile Materials under Plane Stress

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In designing structural elements and machine parts using ductile materials, it is crucial to ensure that these components withstand applied stresses without yielding. Yielding is initially determined through a tensile test, which evaluates the material's response to uniaxial stress. However, tensile stress is insufficient when components face biaxial or plane stress conditions This condition requires advanced criteria to predict failure.
The Maximum Shearing Stress Criterion, also known as...
839

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Nanoscale α Phase Enables Excellent Strength-Ductility Balance in TC21 Titanium Alloy.

Keyu Ma1, Zehua Jiang1, Kaihong Wu1

  • 1Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China.

Nanomaterials (Basel, Switzerland)
|April 13, 2026
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Summary

Researchers improved titanium alloy ductility using warm rolling and aging. This process enhances strength and fracture resistance for critical load-bearing applications.

Keywords:
TC21 alloyductilitymechanical propertiesnanoscale α phasestrengthening mechanism

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Area of Science:

  • Materials Science
  • Metallurgy
  • Mechanical Engineering

Background:

  • Conventional titanium alloys possess limited ductility, restricting their use in high-stress applications.
  • Developing titanium alloys with enhanced strength and ductility is crucial for advanced engineering.

Purpose of the Study:

  • To investigate the effects of warm rolling and aging on the microstructure and mechanical properties of Ti-6Al-2Mo-2Nb-2Zr-2Sn (TC21) titanium alloy.
  • To achieve an optimal combination of high strength and ductility in TC21 titanium alloy for load-bearing components.

Main Methods:

  • Thermo-mechanical processing including warm rolling at 500 and 600 °C, followed by aging treatment.
  • Microstructural analysis using scanning electron microscopy (SEM), electron backscatter diffraction (EBSD), and transmission electron microscopy (TEM).
  • Mechanical property evaluation via uniaxial tensile tests and nanoindentation.

Main Results:

  • Warm rolling at 600 °C yielded an alloy with 1138 MPa yield strength and 7.3% elongation.
  • Subsequent aging further increased yield strength to 1263 MPa while maintaining 9.6% ductility.
  • Microstructure analysis revealed nanoscale secondary α phase (αs) lamellae, with interface strengthening identified as the key mechanism.

Conclusions:

  • Thermo-mechanical processing, specifically warm rolling at 600 °C followed by aging, significantly enhances the strength-ductility combination of TC21 titanium alloy.
  • The formation of nanoscale αs lamellae and optimized soft phase characteristics are responsible for the improved mechanical properties.
  • This study presents a viable method for producing high-performance titanium alloys for demanding engineering applications.