Pure titanium is a lightweight, high-strength, and corrosion-resistant metal material, and its fracture toughness is a key performance indicator. In recent years, researchers from the School of Materials Science and Engineering at Xi'an Jiaotong University have made significant progress in improving the fracture toughness of titanium alloys.
Through a systematic study of pure titanium, the research team discovered that oxygen impurities in titanium are the primary factor contributing to its insufficient fracture toughness. The oxygen content in commercially pure titanium is typically 0.14 wt%. By reducing the oxygen impurity content to 0.02 wt%, the research team successfully increased the fracture toughness of pure titanium from 117 MPa∙m1/2 to 255 MPa∙m1/2. This discovery not only dispels the conventional wisdom that titanium's fracture toughness is below 130 MPa∙m1/2, but also makes low-oxygen titanium one of the toughest metals known. Furthermore, the study revealed a novel progressive toughening mechanism: reducing the oxygen content not only promotes the activation of deformation twins at the crack tip, but also reveals that twin boundaries act as efficient dislocation sources, emitting a large number of <c+a> dislocations, effectively overcoming the difficulty of <c+a> dislocation self-propagation. These findings provide new insights into the design of high-damage-tolerance titanium alloys.
Notably, the physical and mechanical properties of pure titanium also significantly influence fracture toughness. For example, pure titanium has a density ρ of 4.507 g/cm³, a melting point of 1668±10°C, a specific heat capacity C of 522.3 J/(kg·K), a thermal conductivity λ of 11.4 W/(m·K), and a resistivity ρ of 420 nΩ·m. In terms of mechanical properties, pure titanium has a tensile strength (σb) of 235 MPa, a yield strength (σ0.2) of 140 MPa, an elongation (δ) of 54%, a hardness (HBS) between 60 and 74, and an elastic modulus (E) of 106 GPa.
These research findings not only provide a new theoretical basis for the application of titanium alloys but also point the way for further research and development. With in-depth research into the fracture toughness of titanium alloys, the future application prospects of titanium alloys in aerospace, marine engineering, biomedicine, and other fields will be even broader.
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