Analysis of Shear Properties of TA8 Titanium Alloy

1.1 Shear modulus and shear strength
The shear modulus of TA8 titanium alloy is closely related to the elastic modulus of the material. According to the experimental data, the shear modulus of TA8 titanium alloy is approximately 42 GPa. The shear modulus defines the elastic deformation capacity of a material under the action of shear force. In aviation manufacturing, this value of TA8 titanium alloy provides it with a relatively high resistance to deformation.

Shear strength refers to the ability of a material to resist damage under the action of shear force. According to experiments, the shear strength of TA8 titanium alloy is approximately 450 MPa, which is slightly higher than that of other industrial titanium alloys (such as TA2 and TA6). Its high shear strength makes TA8 titanium alloy have superior anti-failure ability in aviation components, and it is suitable for parts with large shear stress, such as engine blades and wing frames.
1.2 Shear deformation behavior
In practical use, the shear deformation of TA8 titanium alloy at high temperatures is particularly prominent. It is concluded through high-temperature tensile experiments that the shear deformation of TA8 titanium alloy gradually increases within the temperature range of 400°C to 600°C. This is related to the changes in the microstructure of the alloy, especially under high-temperature conditions, where the slip system of the α phase becomes active, increasing the possibility of shear deformation.

TA8 titanium alloy shows relatively low shear toughness under low-temperature conditions. Shear experiments were conducted at -100°C, and it was found that its ductility decreased and the material was more prone to brittle shear failure. This phenomenon needs to be paid attention to in extremely low-temperature application scenarios to ensure the safe use of alloys.

1.3 Shear fracture morphology
The shear fracture surface of TA8 titanium alloy was observed by scanning electron microscopy (SEM), and it was found that it presented a typical ductile fracture morphology. A large number of tiny pits are distributed on the fracture surface, indicating that the material undergoes significant plastic deformation when subjected to shear stress. The α -phase particles in the microstructure are closely combined with the grain boundaries, further enhancing the shear strength and ductility of the material.

Under high-temperature conditions (such as 600°C), the fracture surface shows a certain degree of cleavage fracture characteristics, indicating that at high temperatures, the toughness of TA8 titanium alloy decreases and it is prone to local brittle failure. Therefore, when using this material under high-temperature working conditions, the changes in its shear properties need to be taken into account.