Niobium is a soft, grey, ductile transition metal, often found in the minerals pyrochlore (the main commercial source for niobium) and columbite.
Strength of Niobium
In mechanics of materials, the strength of a material is its ability to withstand an applied load without failure or plastic deformation. Strength of materials basically considers the relationship between the external loads applied to a material and the resulting deformation or change in material dimensions. In designing structures and machines, it is important to consider these factors, in order that the material selected will have adequate strength to resist applied loads or forces and retain its original shape. Strength of a material is its ability to withstand this applied load without failure or plastic deformation.
For tensile stress, the capacity of a material or structure to withstand loads tending to elongate is known as ultimate tensile strength (UTS). Yield strength or yield stress is the material property defined as the stress at which a material begins to deform plastically whereas yield point is the point where nonlinear (elastic + plastic) deformation begins.
Ultimate Tensile Strength of Niobium
Ultimate tensile strength of Niobium is 275 MPa.
Yield Strength of Niobium
Yield strength of Niobium is 70 MPa.
Modulus of Elasticity of Niobium
The Young’s modulus of elasticity of Niobium is 70 MPa.
The shear modulus of elasticity of Niobium is 38 GPa.
The bulk modulus of elasticity of Niobium is 170 GPa.
Hardness of Niobium
In materials science, hardness is the ability to withstand surface indentation (localized plastic deformation) and scratching. Brinell hardness test is one of indentation hardness tests, that has been developed for hardness testing. In Brinell tests, a hard, spherical indenter is forced under a specific load into the surface of the metal to be tested.
Brinell hardness of Niobium is approximately 740 MPa.
The Vickers hardness test method was developed by Robert L. Smith and George E. Sandland at Vickers Ltd as an alternative to the Brinell method to measure the hardness of materials. The Vickers hardness test method can be also used as a microhardness test method, which is mostly used for small parts, thin sections, or case depth work.
Vickers hardness of Niobium is approximately 1300 MPa.
Scratch hardness is the measure of how resistant a sample is to permanent plastic deformation due to friction from a sharp object. The most common scale for this qualitative test is Mohs scale, which is used in mineralogy. The Mohs scale of mineral hardness is based on the ability of one natural sample of mineral to scratch another mineral visibly.
Niobium is has a hardness of approximately 6.
Niobium – Crystal Structure
A possible crystal structure of Niobium is body-centered cubic structure.
In metals, and in many other solids, the atoms are arranged in regular arrays called crystals. A crystal lattice is a repeating pattern of mathematical points that extends throughout space. The forces of chemical bonding causes this repetition. It is this repeated pattern which control properties like strength, ductility, density, conductivity (property of conducting or transmitting heat, electricity, etc.), and shape. There are 14 general types of such patterns known as Bravais lattices.
|Ultimate Tensile Strength||275 MPa|
|Yield Strength||70 MPa|
|Young’s Modulus of Elasticity||105 GPa|
|Shear Modulus of Elasticity||38 GPa|
|Bulk Modulus of Elasticity||170 GPa|
|Brinell Hardness||740 MPa|
|Vickers Hardness||1300 MPa|
Properties of other elements