Question

Through which properties we differenciat the materials ?​

Answer 1

Answer:

There is a difference between mechanical properties and physical properties of an alloy.

Physical properties are things that are measurable. Those are things like density, melting point, conductivity, coefficient of expansion, etc.

Mechanical properties are how the metal performs when different forces are applied to them. That includes things like strength, ductility, wear resistance, etc.    

The mechanical and physical properties of materials are determined by their chemical composition and their internal structure, like grain size or crystal structure. Mechanical properties may be greatly affected by processing due to rearrangement of the internal structure. Metalworking processes or heat treatment might play a role in affecting some physical properties like density and electrical conductivity, but those effects are usually insignificant.

Mechanical and physical properties are a key determinant for which alloy is considered suitable for a given application when multiple alloys satisfy the service conditions. In almost every instance, the engineer designs the part to perform within a given range of properties. Many of the mechanical properties are interdependent – high performance in one category may be coupled with lower performance in another.  Higher strength, as an example, may be achieved at the expense of lower ductility. So a broad understanding of the product’s environment will lead to the selection of the best material for the application.

A description of some common physical and mechanical properties will provide information that product designers could consider in selecting materials for a given application.

Conductivity

Corrosion Resistance

Density

Ductility / Malleability

Elasticity / Stiffness

Fracture Toughness

Hardness

Plasticity

Strength, Fatigue

Strength, Shear

Strength, Tensile

Strength, Yield

Toughness

Wear Resistance

Answer 2

Answer:

Discussed below are the most common physical properties that are used in selecting or differentiating materials:

• Density_ implies the weight of a material, with higher density rates implying heavier materials .
• Melting point_ the minimum required temperature for a solid material to change into liquid.
• Color_ the reflective property of a material.
• Boiling point_ the minimum required temperature for a liquid material to change into gas.

Explanation:

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