By the end of 2016, China had only 3 Registered wrought aluminum alloys in the US Aluminum Association Inc: the 6043 alloy registered in 2006, the 5154C alloy registered in 2008 and the 6027 alloy registered in 2010. The deformation of Aluminum Alloy registration to the registration committee at the American Aluminum Association Inc of technology management, participate in national, organizations and units of the Committee for a total of 21, respectively, the French Aluminum Inc and Aluminum Association Inc in the United States Russia Russian Aviation Materials Research Institute, Aluminum Inc, Romania arrow Aluminum Association of Canada, Belgium, the British Association of aluminum aluminum center national metal company forming center, South Africa, the Swiss Federation of Aluminum Aluminum Association, Brazil Aluminum Association, Holland Metallurgical Industry Association, Italy Nonferrous Metals Industry Association, Australian Aluminum Association Inc, Austria nonferrous metal association, the Spanish National Metallurgical Development Centre, China nonferrous metals Technology Institute of economic research, the European Aluminium Association, European space organization, the German standard Aluminum Association, Poland nonferrous metals light gold metal Association It belongs to the branch, the Mexico Aluminum Association, the Argentina Standardization Institute, the Japan Aluminum Association and the Swedish Aluminum Association.


Alloy composition


6043 alloy is a Al-Mg-Si-Cu-Bi-Sn alloy, which is a deformed aluminum alloy opened in the international organization. The alloy was registered in 2006. It is the international registration organization. The first alloy registered in China since 1954 was founded in 1954. It is the only deformation aluminum alloy registered by China in 1919 for the production of small aluminum pieces for 87 years. It is also a green, high-speed cutting aluminum alloy. Usually, all of the deformed aluminum alloys with high speed cutting contain low melting point alloy elements such as Bi, Pb, Sn and so on. Such as 6018, 6023, 6028, 6040, 6041, 6042, 6262A, 6064, 6064A, 6068 alloy and so on.


The melting point of low melting point metal: 327.4 centigrade of Pb, 231.9 C of Sn, 271 C of Bi, 320.9 C of Cd. But Cd and Pb are hazardous to human health, to the environment, should not be used, so that Aluminum Alloy containing Pb for cutting will gradually be less or not were eliminated, replaced by the alloy containing Bi and Sn or other alloy, 6043 alloy under this background and the application of green alloy.


Bi and Sn and the formation of Al compounds, hardly dissolve in Al, but in the form of free particle distribution in aluminum solid solution, cutting in friction heat melting under liquid, has a very good lubrication, which is why Aluminum Alloy containing Bi and Sn for high speed cutting of the original because.


The chemical composition of the 6043 alloy (mass%): Si0.40~0.9, Fe0.50, Cu0.30~0.9, Mn0.35, Mg0.6~1.2, Cr0.15, Zn0.20, Ti0.15, Bi0.40~0.7, Sn0.20~0.40, other impurities 0.05, 0.15, the rest is Al. The content of main alloy elements of 6043 alloy is not much different from those of 6040 and 6041 alloys in terms of Si, Mg, Cu and so on, but the content of Sn is less than that of them, so their performance is equivalent, while the production cost of 6043 alloy will be slightly lower.


Basic performance


The density of 2710kg/m3 6043 alloy is widely used in extrusion pipes and bars, the typical mechanical properties of T9 state materials: tensile strength of Rm=402N/mm2, yield strength Rp0.2=380N/mm2, elongation was A=11%, elastic modulus E=70GN/mm2, shear modulus G=60GN/mm2, Poisson's ratio = 0.33. 6043 alloy has no low temperature brittleness and can be used in the manufacture of cryogenic machine parts.


The liquidus temperature of the 6043 alloy is 652, the solid phase temperature is 582, and the average linear expansion coefficient of the 6043 alloy is 23.4 mu m/ (M. K). At 20 C, the thermal conductivity of T9 state material is 172W/ (M. K), equal volume conductivity 44%IACS, resistivity 39n Omega m, resistance temperature coefficient 0.1N Omega m/k.


The annealing specification of 6043 alloy is 415 C / (2h~3h), and the solid solution temperature is 540 degrees. The manual age specification for rolled bar, cold drawn bar and tensile pipe is 170 /12h / 6h~12h, and the manual age specification for extruded pipe, bar and profile is 176 C. The corrosion resistance of the alloy is high and the surface treatment performance is good.


As of 2016, Alcoa Corp registered 534 commonly used alloys (active alloy), 159 very used alloys (inactive alloy), a total of 593, 3 registered in China, accounting for only 0.506%. (Wang Zhutang)