(1) all elements without exception, to reduce the conductivity of the copper bar and coefficient of thermal conductivity, every element is dissolved in the copper bar, lead to the copper bar lattice constant change, make free charge wave transmission was caused when the fixed term liquidity, promote resistance, in turn, there is no solid quality molarity in copper bar or very few tempering heat treatment elements, has little effect on the conductivity of copper bar and heat transfer, Especially should pay attention to is that some elements in copper bar solid quality molar concentration with temperature decrease and reduce violently, with hydroxide precipitation and metal compounds, as well as tempering heat treatment, and strengthening the copper aluminum alloy, and the conductivity reduce little and the scientific research, high strength and high conductivity aluminum alloy is the key of fine-grain strengthening standards, What should be emphasized here is that aluminum alloy composed of iron, silicon, chromium and copper rod is extremely important for high strength and high conductivity aluminum alloy; Because the influence of aluminum alloy elements on the characteristics of copper rod is cumulative, coCr-Zr series aluminum alloy is high strength and high conductivity aluminum alloy;
(2) The mechanism of copper base corrosion resistant aluminum alloy should be single phase, to prevent the emergence of second phase in aluminum alloy resulting in electrochemical reaction. Therefore, the aluminum alloy element should have a very large molar concentration of solid mass on the copper bar, and even the element of endless phase dissolution. The single-phase electric brass bar, brass bar and white copper bar used in engineering projects have high quality corrosion resistance, which is the key raw material of heat exchanger.
(3) There are soft phase and hard phase in the mechanism of copper base wear resistant aluminum alloy, so when the fine grain is strengthened, it is necessary to ensure that the element added bY wechat friends in addition to solid dissolved copper bar, there should also be hard phase precipitation, copper bar aluminum alloy typical hard phase Ni3Si, FeALSi chemical substances. In recent years, the aluminum alloy of automotive synchronizer transmission gear developed and designed is soft phase a, and the negative phase is hard phase. The A phase is not suitable for more than 10%.
(4) Solid polycrystalline copper bar aluminum alloy with vibration reduction characteristics, such as Cu - Mn aluminum alloy, solid underneath the thermal ductility of the whole austenite changes of aluminum alloy with memory characteristics, such as Cu - Zn - Al, Cu - Al - Mn aluminum alloy.
(5) The color of the copper bar can be changed according to the method of adding wechat friends aluminum alloy elements, such as zinc, aluminum, tin, nickel and other elements, with the transformation of the composition, the color also produces a red, blue, yellow and white transformation, effectively manipulating the composition will get imitation gold raw materials and imitation silver aluminum alloy.
(6) fine grain strengthening of copper rod and aluminum alloy choosed element should be common, cheap and zero pollution, the element should be holding the standard of diversification and small quantity, aluminum alloy raw materials can be developed and utilized, aluminum alloy should have high quality performance, suitable for production and processing into a variety of finished products and semi-finished products processing.
