I want to know the exact difference between metallic and intermetallic. And also are all intermetallic compounds metalllic or not? What is the difference between compound and alloy?
Nobody has mentioned about the ordering. An intermetallic compound should have defined stoichiometry, build own crystalline structure and moreover this structure should be ordered, i.e. position of two (or more) types of atoms is determined, not random. Such ordering differentiates the intermetallic compound from a "common" alloy.
I agree sir,
Actually i am working in intermetallics. I have doubt with the confused words. Like as difference between alloys and compounds. And also like all intermetallics are metals are not?. Like these questions. Could you please clarify if you are aware of these words.
Thank you sir,
From the definition of intermetallic compound "A compound as solid phase consisting of two or more metallic elements, with optionally one or more non metallic elements has different structure form its constituents." So, the total compound should a metal?.
The stoichiometry of the elements in the intermetallic compound should be exact. If i take the full Heusler alloys, like 2:1:1 (X2YZ) type. All are internatallic compounds?.
Is it correct?
Thank you ..
Thank you Dear Gupta,
How can one know that a particular compound is a intermetallic compound are not?
On the differences is that intermetallic compounds have melting point, alloys not. In addition, intermetallic compound use to have an stequimetric atomic ratio.
I think when the crystal structure and physical properties of a material made from two or more material is depend on one of the constituent material depending on the ratio, the material is called Alloy. When mixing of two or more materials resulted into a material whose structure and properties does not depend on any of the constituent materials, is called intermetallic compound.
Fe and Ni crystallizes in the BCC and FCC structure. If you mix Fe and NI together the resultant material will crystallizes in FCC or BCC structure depending on the mixting ratio and the resultant material is called Fe-Ni alloy.
But when mixed Ce, Co, Ge in different ratio sat 1:1:3, 1:1:2, 2:3:5 or other ratio the resultant material formed shows different crystal structure than Ce, Co and Ge structure. So, these materials are called intermetallic compounds.
An intermetallic compounds need not be metallic it can show different properties depending of the constituent materials and there ratio.
Nobody has mentioned about the ordering. An intermetallic compound should have defined stoichiometry, build own crystalline structure and moreover this structure should be ordered, i.e. position of two (or more) types of atoms is determined, not random. Such ordering differentiates the intermetallic compound from a "common" alloy.
Yes, defined stoichiometry and structure definietly differentiates intermetallic compounds from alloys, the latter being many times described as solid solutions. Special properties (such as magnetocaloric properties) and special structures (skyscrapper-type elementary units) can be found in intermetallic compounds which don't exist in alloys. Same for electronic structure.
Alain
Intermetallics are compounds that are formed from two metals. Their crystal structure and properties are completely different from their parent metals. Usually after the formation of an intermetallic alloy, a long range ordering is developed in the material
This long range ordering places restriction on the deformation modes
These restrictions usually are manifested as increased strength (at least at elevated temperatures), reduced ductility and fracture toughness
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