The method of processing of magnesium alloys
(57) Abstract:The method of processing of magnesium alloys includes heating to 280-360°C, manual deformation with a total degree of 88-93% in several transitions from one heat continuously to each other with a speed of 210-1-610-2with-1and air cooling. The technical result achieved by carrying out the invention, consists in forming fine patterns in the deformation process. table 1. The invention relates to the field of metallurgy, in particular to methods of processing of alloys based on magnesium, and can be used in the production of forged semi-finished products such as forgings drive road wheels.A method of processing of magnesium alloys, including heating to 280-400oC and the deformation at this temperature with a deformation rate of 70-90% (Magnesium alloys. The Handbook. So 2. Production technology and properties of castings and deformed semi-finished products. Ed. by I. I. Guriev, M. C. Cukrowa. - M.: Metallurgy, 1978. S. 174).The claimed method of processing coincides with the given method on the following essential features: the presence of the operation of the heating and deformation, the heating mode to 280-360oC, the condition is t forgings sufficiently high and stable level of strength and plastic properties.The closest in technical essence to the proposed method is a method of treatment of magnesium alloys, including multiple heating to a temperature of dissolution of hardening phases with a speed of 50-60oC/min and cooling to 200+10oWith a two-stage deformation, and the first stage is carried out at a cooling before the final heating, and the second when the temperature of the heating and subsequent cooling in water (Ed. mon. USSR N 1033569, C 22 F 1/06, 1983) prototype.In the known method the first stage of deformation is carried out at a temperature below the deformation of the heat, and the second stage at a temperature of initial deformation heating.The claimed method of processing coincides with the given method on the following essential features: the presence of a heating operation to a temperature of deformation, the deformation operation, the execution order of the deformation in two stages, the condition of the second phase of deformation when the temperature under deformation, the final cooling operation.The disadvantage of this method of processing magnesium alloys are: large duration of the technological cycle, uneven rashly and not enough high plastic properties.Task to be solved by the claimed invention is directed, is to increase the plasticity of the material forged semi-finished products while maintaining the strength characteristics.The technical result achieved by carrying out the invention, consists in forming fine patterns in the deformation process.This technical result is achieved in that in the method of thermomechanical processing of magnesium alloys, including heat, manual deformation and cooling, in accordance with the invention, heating is carried out to 280-360oC, with the deformation carried out at least one additional transition deformation, in this case, all transitions deformation is carried out with one heating continuously one after another with the speed of deformation 210-1- 610-2with-1and the total degree of deformation 88 - 93%, and cooling is carried out in the air.Conducting deformation in several transitions continuously one after another from the same heat in the claimed range of strain rates, regulated by the combination of degrees of deformation on transitions from the condition for achieving the total degree of deformation 88-93% allows you to maintain during the Def is in the alloy fine patterns directly in the process.The number of transitions deformation is three or more and depends on the type of alloy, the complexity of configuration stamping, the required level of properties.The claimed method is implemented as follows. Procurement of magnesium alloys are heated to a temperature of deformation and subjected to stepwise deformation on presses, equipped with appropriate stamps. The time interval between transitions may take a few seconds and should be minimized. Finished stamping cooled in the air.The claimed method was tested in the manufacture of forgings drive road wheels alloy MA. The processing conditions and mechanical properties are shown in the table.As can be seen from the table, the ductility achieved the stated way, 2 - 2.3 times higher than the ductility of the prototype. In addition, the mechanical properties also increased by 1.7 to 9.5%. The method of processing of magnesium alloys, including heat, manual deformation and cooling, characterized in that the heating is carried out up to 280 - 360oC, the deformation is carried out with at least one additional transition, with all transitions deformation is carried out with one heating continuously one after another soon with the spirit.
FIELD: metallurgy, processes for making hot rolled band of magnesium alloy.
SUBSTANCE: method comprises steps of producing strip blank by continuous casting of melt of magnesium alloy; hot rolling of strip blank directly after casting at several passes for producing hot rolled band with thickness no more than 50 mm. Hot rolling is performed at initial temperature values 250°C - 500°C for providing final thickness of band no more than 4 mm. At first pass of hot rolling reduction degree is equal at least to 15%.
EFFECT: possibility for making magnesium sheets with improved deformation capability at less costs of manufacturing process.
11 cl, 1 dwg, 2 tbl, 1 ex
FIELD: plastic working of special magnesium base alloys alloyed with elements capable to easy evaporation or to generation at deformation oxides hazard for environment, possibly manufacture of rolled sheets used for making anodes of electrochemical current sources.
SUBSTANCE: method comprises steps of preliminarily deforming heated blank of magnesium base alloy and warm rolling of preliminarily deformed blank for producing sheet; before preliminary deformation placing magnesium alloy blank into envelope of aluminum (Al-Mg-Si system) alloy without sealing. Length of envelope exceeds length of blank at least by 10%. Preliminary deformation is realized by hot rolling or upsetting in die set according to configuration of blank.
EFFECT: production of sheets with electrochemical properties uniform along the whole cross section and with enhanced surface quality, safety labor condition due to preventing evaporation of mercury, toxic oxides and other compounds containing mercury, thallium, gallium, cadmium.
12 cl, 4 tbl, 4 ex
FIELD: metallurgy; production of magnesium alloys which are creep-resistant at high temperatures.
SUBSTANCE: magnesium-based alloys are used for manufacture of articles and castings, cylinder blocks for example. Proposed alloy contains neodymium, cerium and/or lanthanum, zinc, zirconium, manganese, oxidation inhibitor and magnesium. Alloy may additionally contain titanium, hafnium, aluminum, copper, nickel, silicon, silver, yttrium, thorium, iron and strontium. Alloys and articles manufactured from them possess high mechanical properties and high creep resistance at high temperature.
EFFECT: enhanced creep resistance of alloys.
21 cl, 7 dwg, 5 tbl, 2 ex
SUBSTANCE: invention relates to metallurgy field. Particularly it relates to thermomechanical treatment of magnesium alloys and can be used while manufacturing of details in aircraft building, rocket technology, motor car structure, in nuclear reactors. Method includes alloy homogenising annealing at the temperature 415-520°C during 4-24 hours, extrusion at the temperature 300-450°C with drafting ratio 7-18 and equal channel angular extrusion at the temperature 250-320°C with true deformation ratio 6-8.
EFFECT: increasing of solidity and plasticity of magnesium alloys.
SUBSTANCE: casting block is heated and it is implemented two-stage deformation with cooling on air. The second stage of deformation is implemented in isothermal conditions at temperature for 50-100 °C lower than temperature of the first stage at a rate 4·10-2-5·10-1 s-1 and with total degree of deformation 65-85%. Between the first and the second stages of deformation it is implemented treatment at a temperature 180-300°C during 1-12 hours.
EFFECT: received deformed semi-products differs by increased strength, plastic and corrosive characteristics at keeping of low anisotropy, that assist to increasing of resource, reliability of particular products from these semi-products, increases ability of its application.
2 cl, 1 tbl, 8 ex
SUBSTANCE: invention refers to treatment of alloys of system Mg-Al-Zn and can be implemented in aircraft and rocket engineering, and motor industry. The procedure consists in alloy direct pressing at temperature 300-450°C with drawing out degree 7-18 and in alloy equal-channel angular pressing (ECAP) in four runs at temperature 220-260°C with true degree of deformation ε=4.5 by arrangement: the first two runs along route C, the third run along route Bc and the fourth run along route C. Before ECAP and upon it alloy is annealed at temperature 345 °C during 1 hour and cooled in air.
EFFECT: raised plasticity and deformability of magnesium alloys at room temperature.
SUBSTANCE: here is disclosed item out of magnesium alloy with coating containing base made out of rolled magnesium alloy containing from 5 to 11 wt % of Al and with medium dimension of crystal grain 30 mcm or less, dimension of inter-metallic compounds 20 mcm or less and depth of surface defect 10 % or less from thickness of rolled magnesium alloy and with anti-corrosion coating. The fabrication procedure consists in production of blank out of rolled magnesium alloy and in application of anti-corrosion coating.
EFFECT: upgraded mechanical properties and corrosion resistance of alloy for fabrication of item.
30 cl, 1 dwg, 20 tbl, 16 ex
SUBSTANCE: low-temperature heat treatment of alloy involves the following stages: (a) providing an alloy capable of strengthening during ageing on the basis of magnesium which is treated with homogenising annealing and hardened, and (b) carrying out the low-temperature ageing of the above alloy at temperature below 100 °C during the period of time required for development of improved response to ageing. Aged alloy contains disperse allocations like Guinier-Preston (GP) zones, including flat GP1 and prismatic GP2 disperse allocations perpendicular to the main magnesium plane.
EFFECT: formation of fine allocations of high number density and improvement of hardness and ductility of alloy.
18 cl, 1 tbl, 11 dwg
SUBSTANCE: plate made from magnesium alloy, product obtained by plastic plate formation and method for its obtaining are proposed. Plate made from magnesium alloy having half-width of peak, which is 0.20 to 0.59 degrees for diffraction peak (0004) at monochromatic x-ray diffraction, which has the value of orientation indicator along axis c, which is equal to 4.00 or higher, and average inclination angle of axis c, which is equal to five degrees or less. The product can be obtained by plastic formation at the temperature of 200°C or higher of the plate made from magnesium alloy. Method for obtaining the plate from magnesium alloy, which involves ingot rolling from magnesium alloy, formation of stress in the plate by its being passed between rolls heated to the temperature of 150°C - 300°C. Plate made from magnesium alloy has high plastic formability when in warm condition.
EFFECT: product made of the plate is characterised by high resistance to impact actions.
18 cl, 2 dwg, 7 tbl, 2 ex
SUBSTANCE: invention relates to metallurgy, particularly, to producing articles from aluminium or magnesium alloys with nano- and sub micro crystalline structure, and articles made thereof. Proposed method comprises preliminary equal-channel angular pressing and subsequent strain-forming of articles thereof. Said equal-channel angular pressing is performed at deformation temperature and rate selected subject to alloy composition by preset relation while strain-forming is carried out by extrusion at room temperature and deformation rate selected subject to alloy composition by preset relation.
EFFECT: better manufacturability, higher strength and ductility.
9 cl, 2 dwg, 1 tbl