| 摘要 |
This invention relates to metallurgy, more specifically, to wrought aluminum base alloys, and can be used for the fabrication of products with up to 350° C. working temperature range. The technical result achieved in the first and second objects of this invention is providing a new heat resistant aluminum base alloy the wrought semifinished products of which (sheets, rods, wire, die forgings products or pipes) have high strength, heat resistance and electrical conductivity. Said technical result is achieved in the first object of this invention as follows. The aluminum base alloy contains copper, manganese, zirconium, silicon, iron and chromium in the following amounts, wt. %: Copper 0.6-1.5 Manganese 1.2-1.8 Zirconium 0.2-0.6 Silicon 0.05-0.25 Iron 0.1-0.4 Chromium 0.01-0.3  Aluminum balance The alloy contains zirconium in its structure in the form of Al3Zr phase nanosized particles not greater than 20 nm in size, and manganese mainly forms secondary particles of the Al20Cu2Mn3 phase not greater than 500 nm in size in a quantity of at least 2 vol. %. Said technical result is achieved in the second object of this invention as follows. The method of fabricating wrought semifinished products from said aluminum base alloy comprises producing a melt of the alloy and fabricating a cast piece by solidifying said alloy, these operations being carried out at a temperature that is at least 50° C. above the liquidus temperature. The intermediate wrought semifinished product is obtained by deforming said cast piece at a temperature of within 350° C. in two stages with an intermediate 340-450° C. anneal. Then the intermediate wrought semifinished product is annealed at 340-450° C., and wrought semifinished product is obtained by deforming the intermediate wrought semifinished product at room temperature. Finally the wrought semifinished product is annealed at 300-400° C. |
