FIELD: metallurgy.
SUBSTANCE: invention relates to non-ferrous metallurgy, namely, to production and processing of ultra-fine aluminum alloys, and can be used for production of high-strength articles in conditions of superplasticity by isothermal extrusion, volume or sheet forging, as well as molding. Ultra-fine aluminum alloy of 7000 series of Al-Zn-Mg and Al-Zn-Mg-Cu system is characterized by a structure having average grain size of not more than 500 nm, wherein at least 60 % of grains have large-angle boundaries disoriented relative to adjacent grains at angles of 15 degrees or more, on which grain-boundary segregations are formed by atoms of basic alloying elements Zn, Mg, Cu or at least one of them, and hardening phase particles η-MgZn2 with size of 10-20 nm, wherein the grains consist of an aluminum matrix containing nanoclusters uniformly distributed in the bulk of grains, formed by atoms of alloying elements Zn, Mg, Cu or at least one of them, with size of 2-5 nm, and particles of the strengthening phase η-MgZn2 with size of 10-20 nm. Method of obtaining article from ultra-fine aluminum alloy of series 7000 of system Al-Zn-Mg and Al-Zn-Mg-Cu includes production of workpiece, billet annealing at 460-490 °C, hardening into water, intensive plastic deformation at temperature not higher than 200 °C with total true accumulated deformation e≥4 and shaping superplastic deformation at temperature not higher than 250 °C, deformation rate 10-2-10-5 s-1 with maximum deformation value of not less than 300 %.
EFFECT: invention increases level of mechanical strength of aluminum alloys before and after shaping processing in conditions of superplasticity and fabricate high-strength articles by extrusion, volumetric or sheet forging, as well as molding.
5 cl, 4 dwg, 1 ex
Title | Year | Author | Number |
---|---|---|---|
ULTRA FINE-GRAINED ALUMINIUM ALLOYS FOR ELECTRIC HARDWARE AND METHOD OF THEIR PRODUCTS (VERSIONS) | 2011 |
|
RU2478136C2 |
METHOD FOR PRODUCTION OF SUPERPLASTIC SHEET FROM ALUMINUM-BASED ALLOY AND PRODUCT MADE FROM THE SAME | 2004 |
|
RU2246555C1 |
CONDUCTIVE EXTRA LOW INTERSTITIAL ALUMINIUM ALLOY AND METHOD OF ITS PRODUCTION | 2015 |
|
RU2616316C1 |
METHOD FOR OBTAINING SUPERPLASTIC SHEET OF HIGH-STRENGTH ALUMINIUM ALLOY | 2010 |
|
RU2449047C1 |
HEAT-RESISTANT CONDUCTIVE ULTRAFINE-GRAINED ALUMINUM ALLOY AND METHOD FOR PRODUCTION THEREOF | 2017 |
|
RU2667271C1 |
SUPERPLASTIC ALUMINIUM-BASED ALLOY | 2011 |
|
RU2491365C2 |
Cu-Cr SYSTEM ULTRAFINE COPPER ALLOY AND METHOD OF ITS PRODUCTION | 2011 |
|
RU2484175C1 |
METHOD FOR PRODUCING SUPER-DUCTILE CLAD MATERIAL BASED ON ALUMINIUM | 2016 |
|
RU2637842C1 |
METHOD OF PRODUCING SUPERDUCTILE PLATES FROM ALUMINIUM ALLOYS OF ALUMINIUM-MAGNESIUM-LITHIUM SYSTEM | 2007 |
|
RU2345173C1 |
HIGH-STRENGTH HEAT-RESISTANT FINE-GRAINED ALLOY BASED ON AL-CU-MN-MG-SC-NB-HF SYSTEM AND ITS PRODUCT | 2020 |
|
RU2747180C1 |
Authors
Dates
2020-12-29—Published
2020-06-30—Filed