The metal or alloy bearing, where the same chemical composition, crystal structure and have the same interfaces with other components of the portions separately called a homogeneous phase. The liquid substance is liquid, solid material as the solid phase, if the alloy is the composition of several mutually different crystal structure of the composition, the alloy has several different phases. By the number, shape, size and distribution of a variety of different ways Alloy phase, with the naked eye or microscopic tissue observed microstructure of the material. Alloy phase structure refers to the crystalline alloy phase structure, according to the type of component interaction asked, solid alloy solid solution phase and the metal structure is divided into two major categories of compounds.
     Solid solution
     The group element alloy in the liquid state dissolved in each other to form a homogeneous composition and performance, and the structure is similar to one of the group element is called a solid phase solid solution. Solid solution crystal lattice with the same component as the solvent content in the alloy generally more; another component as the solute, and the corresponding content of less. Therefore, the solid solution can be understood as a solvent type of metal crystal lattice.
     For example, bearing steel, the carbon in the ferrite in a-Fe solid solution. Carbon is a solute, a-Fe is solvent at the body-centered cubic lattice, but also for the ferrite cubic lattice. A, B group element is composed of a solid solution can be expressed as A (B), where A is the solvent, B is the solute. Solid alloy solid solution is an important alloy phase. Industrial metal material used on the majority of a single phase solid solution or in solid solution as the base multiphase alloys.



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