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Why Alloys of metals have greater resistivity than their constituents?
Wiki User
∙ 11y ago
Resistance is due to scattering of conduction electrons. A metallic crystal can be viewed simplistically as a periodic array of ions with a cloud of delocalised conduction elections. The electrons do not scatter of the ions themselves because the crystal is periodic. There are two significant causes of scattering: 1. scattering off vibrations of the atomic lattice (phonons). This contribution to the resistivity is proportional to temperature. 2. scattering off defects in the crystal. At low temperature, this is the cause of a finite 'residual resistivity'. The two terms add linearly Rtotal = R1(T) + R2 Cold working a metal will introduce defects and thus lead to an increase in R2. Conversely, annealling the metal at high temperature will remove defects and reduce the residual resistivity.
Wiki User
∙ 16y ago
Wiki User
∙ 13y agoIt is not a right perception to think that alloys have high resistivity.
Alloys can have high resistivity or low resistivity than the actual elements.
You might be thinking that alloys have high resistivity as many resistors are made of alloys. But by altering the composition of elements, we can also make an alloy of very low resistivity.
Wiki User
∙ 13y agoThe presence of impurities and alloying elements decrease the electrical conductivity of most of the metals.. Hence thereby the alloying of metals increase the resistivity of metals and decrease its electrical conductivity..
But rarely.,, certain magnetic alloys increase its conductivity.
Wiki User
∙ 11y agobecause there properties are beter than metals
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What combination of factors is most suitable for increasing the electrical conductivity of metals?
Resistivity is a constant for any particular material, and independent of that material's physical dimensions or shape. However, it does vary with temperature which is why resistivity is always quoted at a particular temperature. Variations in resistivity due to temperature change is the reason that the resistance of a material varies with temperature. In SI, resistivity is expressed in ohm metres.
What is the chemical symbol for inconel?
inconel is a term referring to a group of alloys. Alloys have variable compositions as they can considered to be solid solutions of metals. inconels main constituents are Ni and Cr with many other elemnts in smaller proportions.
Why does nichrome get hot?
Nichrome has a high electrical resistivity.
Is a metal and an alloy the same thing?
An alloy is a type of metal (specifically, it's a solid solution of dissimilar metals). All alloys are metal, but not all metals are alloys ... pure metals (pure gold or pure copper, for example) are not alloys.
Why are alloys created?
Alloys are more durable than normal metals, this is because its lots of metals together. Its also cheaper to produce than some other metals.
Whether the resistivity of copper or its alloy is greater?
Copper alloy is often used in preference to pure copper due to its hardenss. Pure metals are usually soft and can be cut easily. They are not suitable for making any hard bodies. Therefore, alloys are used.
What combination of factors is most suitable for increasing the electrical conductivity of metals?
Resistivity is a constant for any particular material, and independent of that material's physical dimensions or shape. However, it does vary with temperature which is why resistivity is always quoted at a particular temperature. Variations in resistivity due to temperature change is the reason that the resistance of a material varies with temperature. In SI, resistivity is expressed in ohm metres.
What is the chemical symbol for inconel?
inconel is a term referring to a group of alloys. Alloys have variable compositions as they can considered to be solid solutions of metals. inconels main constituents are Ni and Cr with many other elemnts in smaller proportions.
Metals include elements and alloys?
Alloys contain metals but also nonmetals.
What happens to metal at 200 degrees Celsius?
At 200 C:-- All metals become hot to the touch.-- The electrical resistivity of all metals becomes greater than at room temperature.-- The volume of all metals becomes greater than at room temperature.-- Some metals, but not all, melt (become liquid).
What is a Constituents of brass?
metals
What do metals weigh?
There are many various types of Metals and metal alloys. Magnesium is one of the lightest metals. Aluminum alloys is next. Steel alloys and Lead and Gold are the heaviest metals.
Are alloys ore of metals?
Alloys are several metals, and possibly some other substances, mixed together.
What are the components of alloys?
Metals.
WHAT ARE none metals?
alloys
Solid solutions of metals or non metals dissolved in metals?
Alloys
Why does nichrome get hot?
Nichrome has a high electrical resistivity.
