| We often add two or more metal elements or metal-based addition of other non-metallic elements through the alloying process (melting, mechanical alloying, sintering, vapor deposition, etc.) formed by the metal properties of metal materials called alloy. But the alloy may contain only one metal element, such as steel. (Steel, is the percentage of carbon content between 0.02% to 2.00% of the iron alloy collectively) here we need to note that the alloy is not a general concept of the mixture, or even a pure material, such as a single phase of the metal interchange Alloy, the addition of alloying elements can form solid solution, compounds, and produce endothermic or exothermic reactions, thereby changing the nature of the metal matrix. The formation of the alloy often improves the nature of the elemental element, for example, the strength of the steel is greater than its main constituent element. The physical properties of the alloy, such as density, reactivity, Young's modulus, conductivity and thermal conductivity, may be similar to those of the alloy, but the tensile strength and shear strength of the alloy are usually related to the properties of the constituent elements with large differences. This is due to the alloy and the elemental arrangement of atoms are very different. A small amount of an element may have a significant effect on the properties of the alloy. For example, impurities in ferromagnetic alloys change the properties of the alloy. Unlike pure metal, most alloys do not have a fixed melting point, the temperature is in the melting temperature range, the mixture is solid-liquid coexistence state. It can be said that the melting point of the alloy is lower than that of the component metal. See eutectic mixture. Among the common alloys, brass is made of copper and zinc alloy; bronze is tin and copper alloy, used for statues, decorations and church bells. |
