| 摘要 |
The invention relates to non-ferrous metallurgy, in particular to cast alloys based on aluminium and can be used at production of articles working at high temperatures. An alloy contains the following components, w/w: magnesium 4.0-16.0, silicon 2.0-9.0, manganese 0.05-1.5, scandium, 0.01-0.6, zirconium 0.05-0.5, at least one or several elements are selected from the group containing: chromium 0.05-0.5, copper 0.1-2.0, nickel 0.05-1.0, hafnium 0.01-0.6 and one or several elements are selected from the group containing: titanium 0,05-0.6, boron 0.005-0.05, yttrium 0.01-0.85, germanium 0.001-0.2, at 0.001 % < (titanium+boron+yttrium+germanium) <1.5 %, aluminium – the rest. A method for alloy producing provides the alloy cooling with rate sufficient toalloy elements not to be extracted from solid solution during cooling as coarse crystals and to provide formation of disperse particles of strengtheningL1phase at subsequent heat treatment. The method for heat treatment of alloy provides the annealing on air within temperature range of 200-400 °C during 2-50 hours mainly in the range 250-300 °C during 2-10 hours for formation of disperse coherent matrixes of α-Al solid solution of phase nanoparticles with structure L1, which chemical nature differs from chemical compound of phases forming the eutectics (α-Al+MgSi). The technical result: high strength and wear resistance at temperatures exceeding 250 ºC in combination with high fluidity. |
