How does Young's modulus change with material impurities?

Young's modulus decreases with material impurities due to increased dislocations and decreased bonding strength.

When a material contains impurities, such as foreign atoms or defects in its crystal structure, it can affect the material's mechanical properties. Young's modulus, which is a measure of a material's stiffness or resistance to deformation under stress, is one such property that can be affected.

Impurities can introduce dislocations in the crystal structure, which are areas where the atoms are not in their regular positions. Dislocations can make it easier for the material to deform under stress, which means that the material will have a lower Young's modulus.

Additionally, impurities can weaken the bonding strength between atoms in the material. This means that the material will require less stress to cause deformation, again resulting in a lower Young's modulus.

In some cases, impurities can also lead to the formation of voids or defects in the material, which can further reduce its stiffness and strength.

Overall, the presence of impurities in a material can significantly affect its mechanical properties, including Young's modulus. It is therefore important to carefully control the purity of materials used in engineering applications to ensure that they have the desired properties.