Aluminium Nitride Young'S Modulus

Young's modulus is a measure of the stiffness or rigidity of a material. It is defined as the ratio of stress to strain in a material under applied force.

Aluminium nitride (AlN) is a ceramic material that exhibits exceptional thermal and mechanical properties, making it an attractive material for various high-temperature and high-power applications. Its Young’s modulus depends on several factors, such as crystal orientation, temperature, and microstructure.

The typical value of Young's modulus for single-crystal AlN ranges from 300 to 400 GPa (gigapascals). However, the polycrystalline form of AlN, which is commonly used in engineering applications, exhibits a lower Young's modulus due to the presence of grain boundaries and defects.

The Young’s modulus of polycrystalline AlN can vary widely depending on the processing method and the degree of densification achieved during sintering. Generally, higher sintering temperatures and longer sintering times lead to increased densification and higher Young's modulus.

The reported values of Young's modulus for polycrystalline AlN range between 200 and 400 GPa, with an average value of around 300 GPa. This makes AlN one of the stiffest ceramics and comparable to other advanced materials such as silicon carbide and diamond.

It is worth noting that the actual Young's modulus of AlN in practical applications may differ from the measured value due to factors such as residual stresses, temperature gradients, and loading conditions. Therefore, it is important to consider these factors when designing and analyzing AlN-based devices and structures.