Method for producing flat products made of aluminum alloys
a technology of aluminum alloys and flat products, applied in the field of aluminum metallurgy, can solve the problems of reducing ductility, most labor-intensive and power-consuming operations in the manufacture of flat rolled, and increasing the pressure on reducing production costs, and achieve the effect of eliminating costly thermal annealing steps
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example 1
[0034]Performance of ion-beam treatment in the rolling Al—Mg alloy sheet (so-called, magnaliums).
[0035]After the rolling of an AlMg6 until alloy hardening / cold work makes further rolling impossible. The surface of the rolled sheet is irradiated with Ar+ ions having an energy of 40 keV, and an ion current density of 400 mA / cm2. The sheet has a thickness of 4 mm and is irradiated from both sides for a period of 30 seconds
[0036]In the course of irradiation continuous monitoring of target temperature is carried out by means of a chromel-alumel thermocouple. The ultimate temperature, to which sheets are heated within the short course of irradiation, does not exceed 400° C.
[0037]Mechanical testing of tensile specimens cut out from hardened, annealed, and irradiated sheets was performed at Kamensk Uralsky Metallurgical Works J.S.Co. These tests show that as a result of ion irradiation, irrespective of specimen temperature, ductility increases due to a substantial decrease in alloy / sheet st...
example 2
[0044]Performance of ion-beam treatment in the course of rolling sheets in aluminum alloy 1441 of system Al—Li—Cu—Mg with lithium content of 1.8-2.1 wt %.
[0045]After cold rolling to the point that further rolling is impossible (a thickness of about 1.0 mm), instead of applying a conventional intermediate annealing at T=380-420° C. for 2 hours, both surfaces of a sheet in alloy 1441 are irradiated with Ar+ ions having an energy of 40 keV, with ion current density of 400 mA / cm2.
[0046]The results of mechanical testing of initially hardened, thermally annealed, and irradiated specimens show that the mechanical properties of sheets in alloy 1441 after ion-beam treatment are close to the properties obtained by intermediate thermal annealing (Table 2). Irregular cellular dislocations with cell central area average diameters of from 0.5 to 2 μm are found in hardened alloy 1441.
[0047]After thermal annealing at temperatures 380-420° C. for 2 hours the structure of alloy 1441 is irregular: the...
example 3
[0050]Ion-beam treatment in the course of rolling sheets in aluminum alloy VD1 (Al—Cu—Mg with Mn additives with reduced content of all components (duralumin of increased ductility).
[0051]After cold rolling to a point where alloy hardening makes further rolling impossible instead of conventional intermediate annealing both surfaces of a VD1 alloy sheet having a thickness of 1.5 mm are irradiated for 30 seconds with Ar+ ions having an energy of 40 keV, with an ion current density of 400 mA / cm2.
[0052]The results of mechanical testing of cold work hardened, thermally annealed, and irradiated specimens of alloy VD1 show that after ion-beam treatment a substantial decrease in strength is observed. This loss decrease in strength approximates that obtained by intermediate thermal annealing (see Table 2).
[0053]Electron microscope examination of cold-worked alloy VD1 indicates the presence of a dislocation grained structure with narrow borders between individual cells. Cell diameter is 0.5-2 ...
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