1. All elements reduce the electrical conductivity and thermal conductivity of the copper rod without exception. All elements are dissolved in the copper rod, causing the lattice distortion of the copper rod, causing wave scattering when the free electrons flow directionally, making the resistivity On the contrary, elements with no solid solubility or little solid solution in the copper rod have little effect on the electrical and thermal conductivity of the copper rod. Special attention should be paid to the fact that the solid solubility of some elements in the copper rod increases as the temperature decreases. It can not only solid solution and dispersion strengthen the copper rod alloy, but also reduce the electrical conductivity very little. This is an important alloying principle for the study of high-strength and high-conductivity alloys. It should be pointed out here. The alloy composed of iron, silicon, zirconium, chromium and copper rods is an extremely important high-strength and high-conductivity alloy; since the effects of alloying elements on the properties of copper rods are superimposed, CoCr-Zr alloys are well-known high-strength and high-conductivity alloys. alloy.
2. The structure of copper-based corrosion-resistant alloys should be single-phase to avoid electrochemical corrosion caused by the appearance of a second phase in the alloy. For this reason, the alloying elements added should have great solid solubility in copper rods, and even elements that are infinitely soluble in each other. The single-phase brass rods, bronze rods, and cupronickel rods used in engineering have excellent corrosion resistance. , is an important heat exchange material.
3. There are soft phases and hard phases in the structure of copper-based wear-resistant alloys. Therefore, it must be ensured that the added elements are not only dissolved in copper rods, but also have hard phase precipitation. Typical copper rod alloys There are Ni3Si and FeALSi compounds in the hard phase, and the a phase should not be more than 10%.
4. Solid-state polycrystalline copper rod alloys have damping properties, such as Cu-Mn alloys, and alloys with thermoelastic martensitic transformation in solid state have memory properties, such as Cu-Zn-Al, Cu-Al-Mn Alloy.
5. The color of the copper rod can be changed by adding alloying elements, such as adding zinc, aluminum, tin, nickel and other elements. With the change of content, the color also changes from red, green, yellow and white. Reasonably Controlling the content yields imitation gold materials and imitation silver alloys.
6. Elements selected for the alloying of copper rods and alloys.
Post time: May-31-2022